We've had the same performance issues with the 860's (not just on BSD).
We contacted Dell support and they suggested to download the Linux Dell
Rescue CD, and enable the cache policy on the Virtual Disk on the
controller.
You can download the rescue CD here:
http://linux.dell.com/monitoring.shtml
You have to disable all OMSA tools when the CD is booted (icon on
desktop), after which you can start the LSI SAS Raid manager.
After starting just click the virtual disk and go to "set properties" or
something.
We tried that on a BSD system, and this resolved the issue for us (now
over 50MB/sec. seq. write).
Regards,
Ruben van der Zwan
Espen Tagestad wrote:
Hi,
We recently bought 3 new Dell 860 servers with the onboard SAS5/IR
SATA RAID-controller. They seem to be quite well spec'ed servers with
management and everything - but I am experiencing av major performance
issue with the disc i/o. On write I get at max 7-8MB/sec, while read
gives a bit more (11MB/sec). I tried first with 6.2-RELEASE, and then
upgraded to 6.3-PRERELEASE without any better results.
I am aware of some discussion around this issue on these two maillists
in the spring earlier on this year, but I have not been able to find
any good resolution. My old firewall/router at home equipped with a
733Mhz Pentium 3 processor and a old 40GB IDE harddrive made around
year 2001 performe better. Is there anybody out there with the same
problem who has solved this issue? Could it be that this is solved in
7.0?
Thanks in advance.
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