On Tue, Jul 22, 2008 at 5:32 PM, Scott Marlowe <scott.marlowe@xxxxxxxxx> wrote: > On Tue, Jul 22, 2008 at 6:04 PM, Jeffrey W. Baker <jwbaker@xxxxxxxxx> wrote: > >> Strangely the RAID controller behaves badly on the TPC-B workload. It >> is faster than disk, but not by a lot, and it's much slower than the >> other flash configurations. The read/write benchmark did not vary when >> changing the number of clients between 1 and 8. I suspect this is some >> kind of problem with Areca's kernel driver or firmware. > > Are you still using the 2.6.18 kernel for testing, or have you > upgraded to something like 2.6.22. I've heard many good things about > the areca driver in that kernel version. These tests are being run with the CentOS 5 kernel, which is 2.6.18. The ioDrive driver is available for that kernel, and I want to keep the software constant to get comparable results. I put the Samsung SSD in my laptop, which is a Core 2 Duo @ 2.2GHz with ICH9 SATA port and kernel 2.6.24, and it scored about 525 on R/W pgbench. > This sounds like an interesting development I'll have to keep track > of. In a year or two I might be replacing 16 disk arrays with SSD > drives... I agree, it's definitely an exciting development. I have yet to determine whether the SSDs have good properties for production operations, but I'm learning. -jwb
