Imposing ZFS latency limits
Mark Felder
feld at feld.me
Mon Oct 22 13:21:24 UTC 2012
On Tue, 16 Oct 2012 10:46:00 -0500, Steven Hartland
<killing at multiplay.co.uk> wrote:
>
> Interesting, what metrics where you using which made it easy to detect,
> work be nice to know your process there Mark?
One reason is that our virtual machine performance gets awful and we get
alerted for higher than usual load and/or disk io latency by the
hypervisor. Another thing we've implemented is watching for some SCSI
errors on the server too. They seem to let us know before it really gets
bad.
It's nice knowing ZFS is doing everything within its power to read the
data off the disk, but when there's a fully intact raidz it should be
smart enough to kick a disk out that's being problematic.
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