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Peter Velikin

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Top Stories by Peter Velikin

For years, the solution to IO bottlenecks has been pretty consistent: (1) add spindles to decrease seek time and increase throughput, and (2) add as much RAM as you can so your filesystems and applications can cache hot data and avoid disk access entirely.  These brute-force attempts to gain performance are inherently flawed and costly.  The price of increasing the number of disks in an array adds up quick, to say nothing of the investment in additional JBODs when you run out of slots in your array.  And although the cost of consumer-grade memory has fallen, relying upon RAM for caching in enterprise environments can get expensive, quickly.  Worse, once you run out of DIMM slots for all that RAM, you’re left with no way to increase the size of your cache aside from purchasing more servers and building a clustered environment.   Cheaper IOPS: SSD vs Spinning Ru... (more)

Partition Alignment: The Key to SSD Performance

Another Reason Why SSDs Are Not HDDs It is fairly common knowledge that SSDs differ from HDDs in many ways.  SSDs have faster IO, have no moving parts, use less power and cost more money per gigabyte.  There are other, more subtle differences between the two storage devices and in this tech note I will focus on one of those. What Is A Disk Drive Partition? First, let me introduce the concept of a disk drive partition.  A ‘partition’ of a disk drive (either SSD or HDD) refers to a logical storage unit of a physical disk drive.  This allows a single physical drive to be t... (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)

How to Successfully Deploy SSD in the Enterprise

Register > Solid State Disk (SSD) technology is one of the hottest IT areas in 2012. The promise to eliminate storage IO bottlenecks and increase application performance, enable server virtualization, enable data center growth, and reduce IT costs has prompted 83% of all IT departments to consider SSD. But those planning an SSD deployment face a variety of deployment choices. Moreover, choosing poorly can yield large expense, disruption to existing IT environments, and a complex new set of storage management tasks. Join Brian Garrett, Vice President at the Enterprise Strategy Gro... (more)