[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] RESOLVED: bad I/O performance with HP Smart Array RAID
On Wed, Feb 25, 2009 at 1:47 AM, Thomas Aeby <aeby@xxxxxxxxxx> wrote: > Ok, sorry for having thought this might be a XEN issue. Glad you solved it! > > 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 I considered that option once, but the thing is some (if not most) HP servers NEEDS RAID controller and doesn't even offer plain SATA controller. Yaiks. > 50-100MB/s - a real performance boost) or buy a less trashy RAID controller. > I usually stick to the one with 512MB battery-backed cache. Regards, Fajar _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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