[Xen-users] Re: Guest CentOS 5.4 64bit on-top XCP 0.5 issue / HP ProLiant BL460c G6

[nadaoneal <nco2104@xxxxxxxxxxxx>]

I apologize for double-posting, but I've just "verified" with about 50 trials
that capping the RAID max write speed on the dom0 at about 50MB seems to
allow the domU to very consistently write 1GB at 46-48MB/sec, without any
dmesg errors. So I would update my recommendations to:
 - install any relevant firmware upgrades and ensure there's no battery
issue
 - on dom0: echo "50000" > /proc/sys/dev/raid/speed_limit_max
 ... if your domU uses a RAID configuration, you might want to do this on
domU as well
 - on domU and dom0: change default scheduler to noop

Again, hope this is helpful to someone. It's just a band-aid - the actual
fix will come either from the kernel or from a firmware update, or both,
eventually.

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