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Peter Velikin

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This blog begins a series of blogs which present test results of testing performed at VeloBit to investigate the effects of different Linux IO scheduler algorithms on IO bandwidth when SSDs are operated in a simulated enterprise environment. This series of blogs is similar to the series we previously presented documenting IO bandwidth vs. read/write ratio. This first blog will document the test set up and procedures and present the results from one tested device. In following weeks, I will refer the reader back to this blog for test set up and procedure information and simply present the results for another device. After presenting results of a particular week, I will make observations as appropriate. Test Motivation and Procedure For this group of tests, we wanted to focus on the effect of the selected Linux IO scheduler on the IO bandwidth performance of the SSD. An ... (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)

SSD IO Speed vs. Read/Write Ratio - Fusion-io ioDrive 320 GB MLC

This blog continues the series which present results of extensive testing performed at Velobit to investigate SSD IO bandwidth 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: Fusion-io ioDrive 320 GB MLC PCI-E based SSD Test 1: 4 KB Data Request Size Figure 1 shows the measured IO bandwidth as read/write ratio is varied when the request size is 4 KB. The data shows that as the read/write ratio goes from 100% read to 50/50 read/write, the ... (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)

OCZ Vertex 4 low performance with firmware 1.3

We test the performance of our SSD caching software constantly using various Solid State Drives in the VeloBit lab. So when an SSD acts strange, it throws off our testing and merits some investigation. We recently encountered inconsistent and low performance with the relatively new OCZ Vertex 4, running firmware 1.3. For example, in the below tests it delivered the extremely low 15 MB/s write, and only around 100 IOPS with 128 KB random writes. The search for a solution Just as IT users should be, we are extremely concerned with performance when the SSD is experiencing write ampli... (more)