TwinStrata Blog » ROI

Cloud Storage Performance: I/O Does Matter

admin — Tue, 11 Jan 2011 13:57:42 +0000

One of the first decisions you will need to make when tuning your environment for Cloud Storage I/O is what page size you will use to perform writes to your Cloud Storage Provider (CSP). This is one of the configuration parameters you will enter when configuring a new volume in CloudArray.

Page sizing is an important consideration, and represents the smallest unit of data that will be sent to your CSP from your CloudArray appliance, or read back when needed. Choose a size that is too small and you may have to do a lot more I/Os if you need to move a lot of data in bulk. Choose a size that’s too big and you will move more data than you need to.

For example, if your application needs to read a lot of small chunks of data that don’t already reside in your CloudArray cache, then CloudArray will have to issue read requests to the CSP for each of those chunks. If each chunk was 64K in length, and they weren’t contiguous, then CloudArray might have to issue 4 separate read requests for that data. If the data were contiguous, then only 1 read request would need to be made.

Larger Page Sizes will result in more data being read than is needed for the current operation, but it may help performance if that data is needed at any point while it is still in cache. In CloudArray, you can choose variable page sizes from 128 KB (default) all the way to 2 MB. 512 KB is the recommended value for backups and in cases where there is a lot of sequential I/O.

If you do a lot of random small block I/O, you should choose the smaller default page size. This will prevent having to move a lot of empty data between your CSP and the CloudArray appliance. A large page size here will cause slower overall performance since a lot more pages will have to be written to accommodate the data requirements. Likewise, if you are doing backups, you will want the 512 KB (or larger) page size. This will result in fewer overall writes compared to a smaller block size and performance will increase.

This can have an impact in your cost model as well, but nowhere nearly as much as some vendors selling file system-based appliances would have you believe. Some CSP’s will charge a small per transaction fee for each read or write request you make. For Amazon S3 for example, the charge is $0.00001 per write transaction. And so for a 1TB backup, that amounts to 8,388,608 x 128KB transactions, or $83. If you used a 512KB page size, that would amount to 2,097,152 write transactions, or $20 for the write transaction costs. Reads are cheaper by an order of ten. That’s a far cry from the $1K+ figure for a 100GB write that another vendor would cost you.

Visit www.TwinStrata.comfor more info about CloudArray.

A Move to Cloud Storage, Companies Re-Think Data Protection Strategies

Robert Infantino — Tue, 01 Dec 2009 19:50:48 +0000

Ongoing discussions with customers on their challenges with existing data protection solutions are leading to changes within their data center. Customers are frustrated with the current data protection process. More specifically, storing information off-site on tape where it can take anywhere from a few hours to as much as a week to restore information. “This is just plain unacceptable and costly”. Human intervention, misappropriation of data, special security transports for tapes that contain certain types of information are all adding to the latency and cost of storing and retrieving data off-site and on tape.

New technologies and solutions with ROI measured in months are driving the need for change. Once such technology is Cloud storage. One of the many uses for Cloud storage is as a target device for data protection applications. Meaning, as opposed to pointing a data protection application to a tape device or even a disk system, point it to the Cloud. Easily accessible from anywhere around the globe, companies [applications] can securely store and access data in real time, cost effectively and with ease. Tape management and off-site tape storage challenges are mitigated or eliminated.

In the Solutions section of TwinStrata.com and on their respective blog we provide a list of data protection solutions and Cloud storage providers that are qualified to operate with CloudArray software. The list of data protection applications are from well established companies such as Oracle (RMAN), Symantec (Backup Exec), Vizioncore (VRanger Pro) and younger companies such as Veeam, PHD Virtual (esXpress). Cloud storage providers include Amazon.com (S3), EMC Atmos, AT&T and others. These applications and providers work together with CloudArray software to protect data and quickly retrieve information at a moments notice.

Check back from time to time, we will be adding more applications to the list of CloudArray supported applications and Cloud storage providers.

Also, Twinstrata is offering a free 30-day trial of CloudArray software. Click here for link.

Enable Symantec Backup Exec™ to store and retrieve backup data to Cloud storage using CloudArray™ software

Robert Infantino — Mon, 23 Nov 2009 16:20:06 +0000

The following presentation provides a functional overview on how Symantec Backup Exec software together with CloudArray software work seamlessly to protect virtualized and physical server environments. This solution provides an economic and highly reliable storage tier for off-site data backup and replication without the logistics and cost of tape transport.

The presentation also provides a 3-year TCO summary on CloudArray vs. existing backup and replication solutions.

Share your thoughts on connecting your copy of Backup Exec to Cloud storage. Leave comments.

View on SlideShare.net