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Peter Velikin

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Top Stories by Peter Velikin

File System Alignment for SSDs There are many techniques and methods that can be used to tune an IT system to improve overall system performance.  SSD caching is widely being used as a low cost, easy to implement method to quickly increase performance with little or no impact on existing operations.  One thing that needs to be considered when choosing SSD caching is how to configure a file system to maximize the performance increase SSD caching provides. Operating Systems and Block Size In the past few years, the sector size of HDDs has increased from 512 bytes to 4k bytes.  Relatively new operating systems (e.g. Windows Server 2008 R2 to present) have evolved to work with this not-so-new sector size to take advantage of higher density drives.  Problems, however, can occur for older operating systems that were not designed to work with the larger block size devices. ... (more)

Don’t Let Your Storage Array Control You

IT Dog getting down and dirty today because that’s what it is going to take to deal with the dirty world of “vendor lock-in.”  There is really no way to dress this up and make it smell nice because it just stinks and although I would roll in something this nasty down at the dog park, I wouldn’t want you to have to live with the smell. I read an excellent article by Chris Mellor at The Register discussing the need to develop a standard for the server flash-storage array interface and it really got me thinking about the vendor lock in issue. “What is EMC... (more)

SDD Cache: Why is Cache Write Through Good?

Whether ‘tis nobler in the mind to suffer the slings and arrows of your IT manager or to take up cache against a sea of data. With apologies to Bill Shakespeare, the IT Dog is discussing two different cache write policies: write through and write back. Let me take a run at telling you what they are, why they are different and what you need to think about when you decide what policy to use. Cache Write Through This is the easier to explain and understand of the two policies discussed here. Cache write through is like having your cake and eating it too. Data is written into cache ... (more)

The Many Places You Can Go with SSD Caching Software

Disruptive technology is a term used to describe an idea or invention that typically disrupts an existing market, often completely displacing an earlier technology.  Sometimes disruptive is great (e.g. digital cameras and cell phones), and sometimes disruptive is not so great (e.g. laser video disks).  SSDs are a disruptive technology in that they are clearly changing the enterprise storage market.  The verdict is still out on just how disruptive SSDs will be; as is the case with many disruptive technologies, it is going to take some time to figure out exactly what to do with SSD... (more)

Using RAM in SSD Caching

Dr Dog Says “You Need More RAM In Your Cache Diet” Well, I am not really a doctor, but I play one on TV. You may remember (if you are old enough) that line from the 1986 Vicks-44 TV commercial.  Anyway, while I may not be a real doctor, I can certainly tell you about why you need more RAM in you cache diet. “I Think My Cache Diet Is Great” If you were happily running your IT system but needed some additional performance, chances are you turned to some kind of SSD caching solution to improve performance at a lower cost point than adding more servers or storage. You went on what I a... (more)