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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)

SSDs: The Beginning of the End for RAM Caching?

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... (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)

Effects Of Linux IO Scheduler On Intel X25-V SSD Performance

This blog is the second in a series which present test results of testing performed at Velobit to investigate the effects of the Linux IO scheduler on SSD performance when SSDs are operated in a simulated enterprise environment.  The test set up and procedure is documented in the first blog post of this series which can be found by clicking here. Test SSD: Intel X25-V SATA based SSD Figure 1: IO Scheduler Bandwidth for Intel X25 Drive: a) random read b) sequential read Figure 2: IO Scheduler Bandwidth for Intel X25 Drive: a) random write b) sequential write Figures 1 and 2 shows th... (more)

Enrollment Starting for VeloBit HyperCache Version 2.0 Beta Program

The release of VeloBit version 1.0 seems like just the other day, but we’re already close to releasing version 2.0. So we’re starting enrollment for our beta program. Here’s why interested IT folks like you would want to enroll in it: No-cost use of the VeloBit HyperCache beta product until release. This means your servers, applications, and databases can have tremendous performance improvements for free! You can confidently accelerate your production environment as soon as VeloBit 2.0 is released, because you have already tested it in your environment. Discounted purchase price... (more)