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A00-205 - Sas webaf server-side application development - BrainDump Information

Vendor Name : SASInstitute
Exam Code : A00-205
Exam Name : Sas webaf server-side application development
Questions and Answers : 55 Q & A
Updated On : November 15, 2018
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A00-205 exam Dumps Source : Sas webaf server-side application development

Test Code : A00-205
Test Name : Sas webaf server-side application development
Vendor Name : SASInstitute
Q&A : 55 Real Questions

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A00-205 exam Dumps Source : Sas webaf server-side application development

Test Code : A00-205
Test Name : Sas webaf server-side application development
Vendor Name : SASInstitute
Q&A : 55 Real Questions

Where will I find material for A00-205 exam?
The material was generally organized and efficient. I could without much of a stretch remember numerous answers and score a 97% marks after a 2-week readiness. Much thanks to you folks for decent arrangement materials and helping me in passing the A00-205 exam. As a working mother, I had constrained time to make my-self get ready for the exam A00-205. Thusly, I was searching for some exact materials and the killexams.com dumps aide was the right decision.


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Uploading Large Files in Windows Azure Blob Storage | killexams.com real questions and Pass4sure dumps

In my last post I talked about Shared Access Signature feature of Windows Azure Storage. You can read that post here: http://gauravmantri.com/2013/02/13/revisiting-windows-azure-shared-access-signature/. In this post we’ll put that to some practical use :) .

One thing I wanted to accomplish recently is the ability to upload very large files into Windows Azure Blob Storage from a web application. General approach is to read the file through your web application using “File” HTML control and upload that entire file to some server side code which would then upload the file in blob storage. This approach would work best for smaller files but would fail terribly when it comes to moderately to very large files as the file upload control would upload the entire file to the server (for bigger files, this would cause timeouts depending on your Internet connection) and then that file resides in the server memory before any action can be taken on that file (again for bigger files, this would cause performance issues assuming you have thousands of users uploading thousands of large files).

In this blog post, we’ll talk about how we can accomplish that using File API feature in HTML5.

Please be warned that I’m no JavaScript/HTML/CSS expert :) . About 4 – 5 years ago I used to do a lot of JavaScript development and built some really insane applications using JavaScript (like mail merge kind of features, office automation, native device interfacing all using JS) but that was then. For last 4 – 5 years, I have been extensively doing desktop application development. So most of the JS code you’ll see below is copied from various sites and StackOverflow :) .

Objectives

Following were some of the objectives I had in mind:

  • The interface should be web based (possibly pure HTML).
  • I don’t have to share my storage account credentials with the end users.
  • If possible, there should not be any server side code (ASP.Net/PHP etc.) i.e. it should be pure HTML and the communication should be between user’s web browser and storage account.
  • If possible, the solution should upload the file in chunks so that bigger files can be uploaded without reading them in completely in a single go.
  • Now let’s see how we can meet our objectives.

    Solution

    Here’re some of the things I did to achieve the objectives listed above.

    Chunking File

    The first challenge I ran into is how to upload the file in chunks. All the examples I saw were uploading an entire file however this is not what I wanted. Finally I ran into this example on HTML5 Rocks where they talked about the File API: http://www.html5rocks.com/en/tutorials/file/dndfiles/. Basically what caught my interest there is the “slicing” feature available in HTML 5’s File interface. In short, what this slice feature does is that it reads a portion of a file asynchronously and returns that data. This is exactly I was looking at. Once I found that, I knew 75% of my work was done! Everything else was a breeze :)

    Securing Storage Account Credentials

    Next thing on my list was securing storage account credentials and this was rather painless as I knew exactly what I had to do – Shared Access Signature. SAS provided me with a secured URI using which users will be able to upload files in my storage account without me giving them access to storage account credentials. This was covered extensively in my post about the same: Revisiting Windows Azure Shared Access Signature.

    Direct Communication Between Client Application and Windows Azure Storage

    Next thing was to facilitate direct communication between the client application and storage. As we know Windows Azure Storage is built on REST so that means I can simply use AJAX functionality to communicate with REST API. One important thing to understand is that Windows Azure Storage still does not support Cross-Origin Resource Sharing (CORS) at the time of writing this blog. What that means is that your web application and blob storage must be in the same domain. The solution to this problem is to host your HTML application in a public blob container in the same storage account where you want your users to upload the files. I’ve been told that CORS support is coming soon in Windows Azure Storage and once that happens then you need not host this application in that storage account but till then you would need to live with this limitation.

    The Code

    Now let’s look at the code.

    HTML Interface

    Since I was trying to hack my way through the code, I kept the interface rather simple. Here’s how my HTML code looks like:

    <body> <form> <div style="margin-left: 20px;"> <h1>File Uploader</h1> <p> <strong>SAS URI</strong>: <br/> <span class="input-control text"> <input type="text" id="sasUrl" style="width: 50%" value=""/> </span> </p> <p> <strong>File To Upload</strong>: <br/> <span class="input-control text"> <input type="file" id="file" name="file" style="width: 50%"/> </span> </p> <div id="output"> <strong>File Properties:</strong> <br/> <p> Name: <span id="fileName"></span> </p> <p> File Size: <span id="fileSize"></span> bytes. </p> <p> File Type: <span id="fileType"></span> </p> <p> <input type="button" value="Upload File" onclick="uploadFileInBlocks()"/> </p> <p> <strong>Progress</strong>: <span id="fileUploadProgress">0.00 %</span> </p> </div> </div> <div> </div> </form> </body>

    image

    All it has a textbox for a user to enter SAS URI and HTML File control. Once the user selects a file, I display the file properties and the “Upload” button to start uploading the file.

    Reading File Properties

    To display file properties, I made use of “onchange” event of File element. The event gave me a list of files. Since I was uploading just one file, I picked up the first file from that list and got its name (blob would have that name), size (blob’s size and determining chunk size) and type (for setting blob’s content type property).

    //Bind the change event. $("#file").bind('change', handleFileSelect); //Read the file and find out how many blocks we would need to split it. function handleFileSelect(e) { var files = e.target.files; selectedFile = files[0]; $("#fileName").text(selectedFile.name); $("#fileSize").text(selectedFile.size); $("#fileType").text(selectedFile.type); } Chunking

    In my application I made an assumption that I will split the file in chunks of 256 KB size. Once I found the file’s size, I just found out the total number of chunks.

    //Read the file and find out how many blocks we would need to split it. function handleFileSelect(e) { maxBlockSize = 256 * 1024; currentFilePointer = 0; totalBytesRemaining = 0; var files = e.target.files; selectedFile = files[0]; $("#output").show(); $("#fileName").text(selectedFile.name); $("#fileSize").text(selectedFile.size); $("#fileType").text(selectedFile.type); var fileSize = selectedFile.size; if (fileSize < maxBlockSize) { maxBlockSize = fileSize; console.log("max block size = " + maxBlockSize); } totalBytesRemaining = fileSize; if (fileSize % maxBlockSize == 0) { numberOfBlocks = fileSize / maxBlockSize; } else { numberOfBlocks = parseInt(fileSize / maxBlockSize, 10) + 1; } console.log("total blocks = " + numberOfBlocks); } Endpoint for File Uploading

    The SAS URI actually represented a URI for blob container. Since I had to create an endpoint for uploading file, I split the URI (path and query) and appended the file name to the path and then re-appended the query to the end.

    var baseUrl = $("#sasUrl").val(); var indexOfQueryStart = baseUrl.indexOf("?"); submitUri = baseUrl.substring(0, indexOfQueryStart) + '/' + selectedFile.name + baseUrl.substring(indexOfQueryStart); console.log(submitUri); Reading Chunk

    This is where File API’s chunk function would come in picture. What happens in the code is that when the user clicks the upload button, I read a chunk of that file asynchronously and get a byte array. That byte array will be uploaded.

    var reader = new FileReader(); var fileContent = selectedFile.slice(currentFilePointer, currentFilePointer + maxBlockSize); reader.readAsArrayBuffer(fileContent); Uploading Chunk

    Since I wanted to implement uploading in chunk, as soon as a chunk is read from the file, I create a Put Block request based on Put Block REST API specification using jQuery’s AJAX function and pass that chunk as data. Once this request is successfully completed, I read the next chunk and repeat the process till the time all chunks are processed.

    reader.onloadend = function (evt) { if (evt.target.readyState == FileReader.DONE) { // DONE == 2 var uri = submitUri + '&comp=block&blockid=' + blockIds[blockIds.length - 1]; var requestData = new Uint8Array(evt.target.result); $.ajax({ url: uri, type: "PUT", data: requestData, processData: false, beforeSend: function(xhr) { xhr.setRequestHeader('x-ms-blob-type', 'BlockBlob'); xhr.setRequestHeader('Content-Length', requestData.length); }, success: function (data, status) { console.log(data); console.log(status); bytesUploaded += requestData.length; var percentComplete = ((parseFloat(bytesUploaded) / parseFloat(selectedFile.size)) * 100).toFixed(2); $("#fileUploadProgress").text(percentComplete + " %"); uploadFileInBlocks(); }, error: function(xhr, desc, err) { console.log(desc); console.log(err); } }); } }; Committing Blob

    Last step in this process is to commit the blob in blob storage. For this I create a Put Block List request based on Put Block List REST API specification and process that request again using jQuery’s AJAX function and pass the block list as data. This completed the process.

    function commitBlockList() { var uri = submitUri + '&comp=blocklist'; console.log(uri); var requestBody = '<?xml version="1.0" encoding="utf-8"?><BlockList>'; for (var i = 0; i < blockIds.length; i++) { requestBody += '<Latest>' + blockIds[i] + '</Latest>'; } requestBody += '</BlockList>'; console.log(requestBody); $.ajax({ url: uri, type: "PUT", data: requestBody, beforeSend: function (xhr) { xhr.setRequestHeader('x-ms-blob-content-type', selectedFile.type); xhr.setRequestHeader('Content-Length', requestBody.length); }, success: function (data, status) { console.log(data); console.log(status); }, error: function (xhr, desc, err) { console.log(desc); console.log(err); } }); Complete Code

    Here’s the complete code. For CSS, I actually used Metro UI CSS – http://metroui.org.ua/. If you’re planning on building web applications and want to give them Windows 8 applications style look and feel, do give it a try. It’s pretty awesome + it’s open source. Really no reason for you to not give it a try!

    <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>File Uploader</title> <script src="js/jquery-1.7.1.js"></script> <link rel="stylesheet" href="css/modern.css"/> <script> var maxBlockSize = 256 * 1024;//Each file will be split in 256 KB. var numberOfBlocks = 1; var selectedFile = null; var currentFilePointer = 0; var totalBytesRemaining = 0; var blockIds = new Array(); var blockIdPrefix = "block-"; var submitUri = null; var bytesUploaded = 0; $(document).ready(function () { $("#output").hide(); $("#file").bind('change', handleFileSelect); if (window.File && window.FileReader && window.FileList && window.Blob) { // Great success! All the File APIs are supported. } else { alert('The File APIs are not fully supported in this browser.'); } }); //Read the file and find out how many blocks we would need to split it. function handleFileSelect(e) { maxBlockSize = 256 * 1024; currentFilePointer = 0; totalBytesRemaining = 0; var files = e.target.files; selectedFile = files[0]; $("#output").show(); $("#fileName").text(selectedFile.name); $("#fileSize").text(selectedFile.size); $("#fileType").text(selectedFile.type); var fileSize = selectedFile.size; if (fileSize < maxBlockSize) { maxBlockSize = fileSize; console.log("max block size = " + maxBlockSize); } totalBytesRemaining = fileSize; if (fileSize % maxBlockSize == 0) { numberOfBlocks = fileSize / maxBlockSize; } else { numberOfBlocks = parseInt(fileSize / maxBlockSize, 10) + 1; } console.log("total blocks = " + numberOfBlocks); var baseUrl = $("#sasUrl").val(); var indexOfQueryStart = baseUrl.indexOf("?"); submitUri = baseUrl.substring(0, indexOfQueryStart) + '/' + selectedFile.name + baseUrl.substring(indexOfQueryStart); console.log(submitUri); } var reader = new FileReader(); reader.onloadend = function (evt) { if (evt.target.readyState == FileReader.DONE) { // DONE == 2 var uri = submitUri + '&comp=block&blockid=' + blockIds[blockIds.length - 1]; var requestData = new Uint8Array(evt.target.result); $.ajax({ url: uri, type: "PUT", data: requestData, processData: false, beforeSend: function(xhr) { xhr.setRequestHeader('x-ms-blob-type', 'BlockBlob'); xhr.setRequestHeader('Content-Length', requestData.length); }, success: function (data, status) { console.log(data); console.log(status); bytesUploaded += requestData.length; var percentComplete = ((parseFloat(bytesUploaded) / parseFloat(selectedFile.size)) * 100).toFixed(2); $("#fileUploadProgress").text(percentComplete + " %"); uploadFileInBlocks(); }, error: function(xhr, desc, err) { console.log(desc); console.log(err); } }); } }; function uploadFileInBlocks() { if (totalBytesRemaining > 0) { console.log("current file pointer = " + currentFilePointer + " bytes read = " + maxBlockSize); var fileContent = selectedFile.slice(currentFilePointer, currentFilePointer + maxBlockSize); var blockId = blockIdPrefix + pad(blockIds.length, 6); console.log("block id = " + blockId); blockIds.push(btoa(blockId)); reader.readAsArrayBuffer(fileContent); currentFilePointer += maxBlockSize; totalBytesRemaining -= maxBlockSize; if (totalBytesRemaining < maxBlockSize) { maxBlockSize = totalBytesRemaining; } } else { commitBlockList(); } } function commitBlockList() { var uri = submitUri + '&comp=blocklist'; console.log(uri); var requestBody = '<?xml version="1.0" encoding="utf-8"?><BlockList>'; for (var i = 0; i < blockIds.length; i++) { requestBody += '<Latest>' + blockIds[i] + '</Latest>'; } requestBody += '</BlockList>'; console.log(requestBody); $.ajax({ url: uri, type: "PUT", data: requestBody, beforeSend: function (xhr) { xhr.setRequestHeader('x-ms-blob-content-type', selectedFile.type); xhr.setRequestHeader('Content-Length', requestBody.length); }, success: function (data, status) { console.log(data); console.log(status); }, error: function (xhr, desc, err) { console.log(desc); console.log(err); } }); } function pad(number, length) { var str = '' + number; while (str.length < length) { str = '0' + str; } return str; } </script> </head> <body> <form> <div style="margin-left: 20px;"> <h1>File Uploader</h1> <p> <strong>SAS URI</strong>: <br/> <span class="input-control text"> <input type="text" id="sasUrl" style="width: 50%" value=""/> </span> </p> <p> <strong>File To Upload</strong>: <br/> <span class="input-control text"> <input type="file" id="file" name="file" style="width: 50%"/> </span> </p> <div id="output"> <strong>File Properties:</strong> <br/> <p> Name: <span id="fileName"></span> </p> <p> File Size: <span id="fileSize"></span> bytes. </p> <p> File Type: <span id="fileType"></span> </p> <p> <input type="button" value="Upload File" onclick="uploadFileInBlocks()"/> </p> <p> <strong>Progress</strong>: <span id="fileUploadProgress">0.00 %</span> </p> </div> </div> <div> </div> </form> </body> </html> Some Caveats

    This makes use of HTML5 File API and while all new browsers support that, same can’t be said about older browsers. If your users would be accessing an application like this using older browsers, you would need to think about alternative approaches. You could either make use of SWF File Uploader or could write an application using Silverlight. Steve Marx wrote a blog post about uploading files using Shared Access Signature and Silverlight which you can read here: http://blog.smarx.com/posts/uploading-windows-azure-blobs-from-silverlight-part-1-shared-access-signatures.

    I found the code working in IE 10, Google Chrome (version 24.0.1312.57 m) on my Windows 8 machine. I got error when I tried to run the code in FireFox (version 18.0.2) and Safari (version 5.1.7) browsers so obviously one would need to keep the browser incompatibility in mind.

    Enhancements

    I hacked this code in about 4 hours or so and obviously my knowledge is somewhat limited when it comes to JavaScript and CSS so a lot can be improved on that front :) . However some other features I could think of are:

    Generate SAS on demand: You could possibly have a server side component which would generate SAS URI on demand instead of having a user enter that manually.

    Multiple file uploads: This application can certainly be extended to upload multiple files. A user would select multiple files (or may be even a folder) and have the application upload multiple files.

    Drag/drop support: This application can certainly be extended to support drag/drop scenario where users could drag files from their desktop and drop them to upload.

    Do upload in Web Worker: This is another improvement that can be done where uploads are done through web worker capability in HTML5.

    Parallel uploads: Currently the code uploads one chunk at a time. A modification could be to upload multiple chunks simultaneously.

    Transient error handling: Since Windows Azure Storage is a remote shared resource, you may encounter transient errors. You could modify the application to handle these transient errors. For more details on transient errors, please see this blog post of mine: http://gauravmantri.com/2013/01/11/some-best-practices-for-building-windows-azure-cloud-applications/.

    Summary

    So that’s it for this post! As you saw, it is quite easy to implement a very simple HTML/JS based application for getting data into Windows Azure Blob Storage. Obviously there’re some limitations and there’s cross-browser compatibility issues one would need to consider but once those are sorted out, it opens up a lot of exciting opportunities. I hope you’ve found this post useful. As always, if you find any issues with the post please let me know and I’ll fix it ASAP.

    Happy Coding!


    How to Choose the Best Flash Array: An SSD Buying Guide | killexams.com real questions and Pass4sure dumps

    Download the authoritative guide: Enterprise Data Storage 2018: Optimizing Your Storage Infrastructure

    Here are two key facts to know before buying enterprise flash storage: First, there is a lot of energy around buying more flash for the corporate data center. Second, as of 2018 only 10% of corporate data centers own an all-flash array.

    This matters because it is important not to get ahead of ourselves in the buying decision. Flash in hybrid arrays has a higher install rate, flash is making inroads into the data center, and flash adoption rates are rising. At the same time, this is nowhere near a done deal for all-flash data centers.

    There is a huge installed user base of good old fashioned hard drives, and tape for that matter. This is not a simple matter of waiting until the old media lifecycles run out and refreshing with flash. Flash development is proceeding very quickly, but for now at least there are cheaper and better media for storing nearline and long-term data. Right now, nothing beats cheap high-capacity disk or tape for cold storage.

    Although flash may work well for active archives (truly active, not just name only) its 3 to 5-year durability window does not make it a trustworthy media for storing long-term data.

    Why Companies Buy Flash

    A key driver of flash investment – and where you will see development and purchases rising rapidly – is flash for high production performance. This includes mission-critical transactional databases, analytics and high-performance computing workloads, virtual desktop infrastructure (VDI) and streaming assets for the broadcasting and medical industries

    https://o1.qnsr.com/log/p.gif?;n=203;c=204650394;s=9477;x=7936;f=201801171506010;u=j;z=TIMESTAMP;a=20392931;e=i

    So, when we discuss enterprise flash storage we are not talking about the mythical Phoenix of the all-flash data center. We are talking about three things:

    1. All-flash arrays for high performance data processing on the shared storage side. These arrays tier from highest performance flash to higher capacity SSDs in the same array. Over time IT should tier the data off the AFA to less expensive media. When they were first introduced a few years ago, FA products tended to be retrofitted hybrid arrays or purpose-built models that lacked the mature data intelligence tools of HDD and hybrid arrays. Over the years AFAs have significantly improved their native data intelligence including compression and D dedupe, native encryption, thin provisioning, and sophisticated management tools.

    2. A subset of AFAs are called flash appliances. They are all-flash storage systems, but unlike mainstream AFAs they have only basic storage intelligence. For example, most data center AFAs come with native dedupe, compression, snapshots, replication thin provisioning, and more.   The flash appliance only has basic storage management features in order to consume a minimal amount of processor overhead. They are strictly for boosting performance with high IOPs, low latency and fast throughput. This allows data center admins to gain very fast performance at a lower cost, since the array is engineered for speed and users do not pay for sophisticated management on top of fast flash.

    3. Server-side flash for the highest possible performance and latency requirements. Server-side flash is essentially direct attached storage on steroids. It is not the optimal choice for many types of data, but it is for extremely high-performing applications.

    Server-based PCIe Cards

    Flash Appliances

    All-Flash Arrays

    Accelerates single application server.

    Example: Oracle Financials database.

    Accelerates multi-host application.

    Example: Docker environment.

    High performance storage array.

    Example: NAND and SATA flash tiers combine performance and capacity.

    Persistent storage or cache for high performance server application.

    Single-digit TB capacity lower than AFA or flash appliance.

    Data protection requires mirroring datasets, which significantly raises prices.

    Combines fast performance and high capacity in the 10s of TBs.

    Simple feature set requires 3rd party functionality for data protection and high availability features.

    High performance networked storage with intelligent data services.

    Efficiently processes mixed workloads.

    Dedupe and compression optimizes capacity.

    Choosing Among Types of Enterprise Flash

    Different Types of Enterprise Flash

    With that in mind, let’s talk about common types of flash, AFAs and server-side flash. We'll also look at use case for each.

    NAND Flash

    NAND is nonvolatile storage that does not require power to retain data. The most widely used type of flash in the world, it is installed in both in consumer devices and enterprise SSDs. NAND comes in many different flavors and development is largely driven by increasing density. Single level cell (SLC) was the start and referred to one bit per cell. Greater density followed with multi-level cell and three-level cell architecture.

    Today, developments include 3D Vertical NAND, or V-NAND flash chips. By stacking cells in vertical layers, the NAND increases SSD performance and durability with less energy requirements. NAND is the primary flash type for all-flash arrays, although not the only one. NAND AFA primary usage cases are high performance storage systems and tiered AFAs that replace slower flash/HDD hybrids.

    SAS and SATA SSDs

    SAS and SATA are the same connection protocols we all know and love from our HDD days. SATA SSDs are generally slower than SAS SSDs and are used for high capacity storage systems that need a boost in performance over HDD high capacity systems. Flash SATA can be manufactured in a DIMM form factor and fit into also into a DDR3 DIMM slot as a server boot device and cache.

    SAS SSDs are considerably more expensive than SATA SSDs but deliver higher performance and more functionality. SAS SSDs use the SCSI interface and dual port architectures. IT often uses flash SAS to map fast drives to different controllers for multi-path I/O and controller failover. They also have more native management tools and usually come with dual ports, which lets IT map each drive to two separate controllers for the fail-over and multi-path IO that are often required in enterprise storage.

    PCI Express (PCIe)

    PCIe is server-side flash that can act as a high performance SSD or server cache. When IT connects a high-performance SSD drive to the PCIe interface, data transfer rates can achieve 252Gb/s and IOPs of 1 million-plus.

    PCIe lowers resource overhead and the requirement for HBAs and drive controller components. PCIe is specific to the server (i.e. Direct Attached Storage) so trades off DAS disadvantages for high performance features. Popular use cases include mission-critical transactional databases.

    Non-Volatile Memory Express (NVMe)

    NVMe is a flash spec that enables SSDs to use the PCIe bus to improve performance and lower energy usage. The specification operates in between random-access memory (RAM) and SSDs. The operating system can access it as a storage device, or as memory if the card resides in memory slots.

    NVMe drivers combined with the PCIe interface results in very low latency under heavy and mixed read/write workloads. This is an especially helpful architecture for massively scaled databases whose performance improves with server-side flash.

    Flash Purchase Decision Points

    The major decision points for flash purchases include both technology and business features.

    Technology: On the technology side, the foundational flash type will make a difference. Even market-leader NAND presents choices between SLC, MLC, EMLC, TLC and more. Device interconnects like PCIe, NVMe, SAS flash and SATA flash are also important to balance performance, capacity and location in the data path.

    Use Case: Ironically, the last concern for some IT buyers should be the first: the use case. VDIs, enterprise data center, streaming web servers, high performance monetized archives: they take different flash decisions.

    Costs and ROI: Costs will also influence your choice. Flash prices are dropping but HDDs are significantly less expensive. As storage pros know, HDDs are not as fast as flash, but perform quite well and, for a lower cost, provide more than adaquate value.

    Warranties and maintenance: It's important to consider your vendors’ warranties and maintenance pricing. Flash energy costs are lower than HDDs, which offsets some of flash devices’ higher purchase price. But if your vendor offers a 2-year warranty instead of 5-year or gives you a low introductory maintenance price then jacks it up in years 2-5, you’re looking at an expensive proposition.

    flash buying guide

    Before You Buy, Consider These Factors

    No matter what your use case for flash, there are 9 critical factors to weigh when you are researching your flash purchase: capacity, performance, availability, durability, scalability, support, management, simplicity and connectivity. Not every flash environment will require top features but know what you are buying and what tradeoffs you are willing to make.

    1.  Capacity. Understand raw capacity, usable capacity and average data reduction ratios with dedupe and compression. Tell the vendor the types of workloads you are likely to use with flash, since different workloads dedupe with very different ratios.

    2.  Performance. Performance entails three measurement: IOPs, throughput and latency. As with dedupe ratios, your performance numbers will differ across different workloads. IOPs are the number of block operations per second, latency is how fast the data transfer begins, and throughput is the measure of how fast each block is processed.

    3.  Availability. 99.999% is the most common enterprise measurement. Asked to see detailed tests and background, and how their flash architecture achieves this level of availability.

    4.  Durability. Specifically ask what durability features the SSDs come with. It should certainly arrive with garbage collection, packet striping, wear leveling and error code correction. If it does not, then you probably bought a cheap SSD but will have to spend more money on third-party products to protect them.

    5.  Scalability. No fewer buying scale up or scale out. With the former, CO far you can scale capacity without hitting performance barriers. If the latter, find out how expensive it is to add SSDs for linear performance and capacity scaling.

    6.  Support. Ask where the support is located, and if engineers can help or just read from a script. Also ask how much support is built into the AFA. Ask about native monitoring services that send alerts about performance impacts, failing SSDs and reaching capacity thresholds. Also go over maintenance contracts with the proverbial fine-comb. You do not want to grab onto a lowball price quote for one to two years, only to watch your operational budget double or triple thanks to support costs.

    7.  Management. Determine that your AFA comes with native intelligence like replication and snapshots, monitoring and alerts, detailed reports, self-healing, application and platform integration, de-dupe and compression and caching and tiering.

    8.  Simplicity. Don’t trade heavy IT overhead for performance gains. Watch for automated management functions including simple firmware upgrades, hot replacements, policy-based management and linear scalability.

    9.  Connectivity. Connectivity should serve you now and in the future. Look for multi-protocol connections and OS support. Consider both iSCSI and FC connections. Check that for high-speed network connections.

    For more questions and answers about flash purchases, see 12 Questions to ask All-Flash Vendors.

    Next Steps in the Flash Buying Decision

    Will the all-flash data center dream come true? It depends on how you define the data center. If the center is production data only, then all-flash is fair game. If you are retaining backup and archives, then all-flash is a poor way to go.

    But you don’t have to hold out for an all-flash data center to invest in all-flash arrays and server-side flash. Like any other IT investment, buy for the usage case. And shop carefully!


    Choose the right type of server-side flash | killexams.com real questions and Pass4sure dumps

    Putting flash into an application server to improve performance is a fairly straightforward decision, but choosing which flash type to deploy can be more involved. There are currently three main form factors of flash storage devices, each of which has its advantages. In this tip, we'll look at drive form-factor SSDs, PCIe cards, flash that's implemented on the memory bus, and to which use cases each is best suited.

    Drive form-factor SSD s

    These SAS and SATA drives were the original flash storage devices, after the USB memory stick. Sharing the same form factor, the first implementation of flash was as a replacement to hard drives, both in servers and in storage arrays. Today, they're available in capacities that range from a few hundred gigabytes to a TB or more, although 800 GB currently seems to be the amount in a high-capacity enterprise SSD.

    SATA SSDs are probably the easiest type of flash to implement, since they simply plug into the existing disk-drive bays. Their other primary advantage is their low cost per gigabyte. Use cases include boot drives for servers and computers, and an easy-to-implement single-server caching or tiering solution, as long as there are SATA drive slots available in the server.

    PCIe flash cards

    Putting flash chips onto a PCIe card has become a popular high-performance SSD solution because it leverages the speed advantages of the PCIe bus over the SAS-SATA interface. Card sizes are both half-length and full-length, with a wide range of capacities, from a few hundred gigabytes up to several TBs. With this real estate, manufacturers can put multiple processors on these cards and actually allow users to subdivide them for multiple workloads or team them for a parallel processing configuration.

    PCIe cards can also support caching software, as well as more sophisticated flash controllers for improved performance, efficiency and better integration with specific software applications. All this leads up to an ideal platform for high performance or high capacity.

    On the downside, PCIe flash typically requires a driver because it's not based on standard storage protocols, like SAS and SATA. This makes implementation and drive replacement more complex, compared with SATA drives than can be hot-swapped in many use cases. They also need a PCIe slot, something that may not be available in a low-profile server. They are also more expensive than SATA SSDs.

    Memory bus flash

    The last of the three primary enterprise server-side solid-state storage types is a flash card that plugs into Dual Inline Memory Module (DIMM) slots. The first product, introduced by Viking Technologies several years ago, uses the DDR3 slot for power but doesn't connect via the memory bus. Instead, it uses a cable to connect to an available SATA header on the motherboard. The most common use case for this product is as a boot drive, but it's also being used in applications where more flash capacity is needed but PCIe or SATA drive slots are unavailable.

    The newest DIMM-based flash technology does use the memory bus, offering the lowest-possible latency of all flash types. A host-level driver and an on-board ASIC enable the CPU to move data to and from the memory space and manage flash-specific tasks, such as garbage collection, write coalescing, etc.

    The technology is referred to as Memory Channel Storage by its manufacturer SanDisk, which partnered with Diablo Technologies on its development. Memory channel storage allows flash to be used as system memory. Since flash is much less expensive than dynamic RAM (DRAM) and many servers have multiple empty DDR3 memory slots, this technology has the potential to expand server memory into the TBs, enabling much larger in-memory database applications.

    A different driver is also available to make memory channel flash look like another storage area for use by caching or tiering software. This is the same use case as the SATA-connected flash DIMM mentioned above and the way PCIe or SAS and SATA SSDs are used as well. A big benefit of using DDR3 slots is to enable flash expansion in servers that have no additional SATA or PCIe slots available or to provide a boot drive that doesn't consume a drive slot. Capacities for currently available DIMM-based flash products go as high as 480 GB per module.

    Server-side flash products are now being used in a wide range of applications, from boot drives to system memory expansion. With three form factors and three connection types, users have multiple ways to make flash fit their individual system constraints and application demands. Whether they need low latency; low cost; simple implementation; or advanced functions like on-board caching, tiering and application awareness, there are flash products available to meet most performance requirements. To summarize, the following is a list of the advantages of each of the primary types of server-side flash:

  • SAS and SATA drive form-factor SSDs. Simplest to implement, lowest cost per gigabyte
  • PCIe flash cards. Higher-performing than SAS and SATA SSDs, highest potential flash capacity, able to support on-board CPUs and software for more sophisticated use cases
  • Memory bus flash. Highest performing flash type, has potential to augment server memory
  • SATA DIMM flash. Performance similar to that of  SATA SSDs, but provides flash capacity or boot drive when no drive slots are available


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