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xen-users
Re: [Xen-users] RESOLVED: bad I/O performance with HP Smart Array RAID
Ok, sorry for having thought this might be a XEN issue.
Multiple Smart Array controllers are known for their really bad disk
write performance. The controller on the machine in question is an
E200i. I have seen many complaints from users out there that around
10-12 MB/s write throughput is about what one can expect from this
controller and even an inofficial citation from HP support classifying
this problem as a "feature".
So far, there seems to be no real solution - a few users have
successfully been able to improve performance by enabling the drive
write caches (which of course is dangerous). My controller does not seem
to support this option at all.
The only real solution seems to get rid of the controller and either use
the disks with a normal SATA-controller with software RAID (where you
can expect 50-100MB/s - a real performance boost) or buy a less trashy
RAID controller.
I do not know yet what we are going to do. So far I know that we must
avoid many HP so-called-servers with I/O-performance of a desktop PC of
the mid-90s.
Best regards,
Tom
--
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Thomas Aeby, Kirchweg 52, 1735 Giffers, Switzerland
Voice : (+41)26 4180040
Internet: aeby@xxxxxxxxxx PGP public key available
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