A couple ZFS questions
Bob Friesenhahn
bfriesen at simple.dallas.tx.us
Mon Oct 12 18:39:18 UTC 2015
On Fri, 9 Oct 2015, Quartz wrote:
> Inside a thread on -questions, it was asked if was a bad idea to have a ZFS
> array that spanned different controllers (ie; motherboard sata + pci-e sata).
> I answered that AFAIK it was ok as long as the speed of the onboard
> ports+drives and card+drives aren't drastically different and that the drives
> are the same. But it occurred to me that maybe that's not true [anymore]. Can
> anyone with more hardware knowledge chime in?
Different should not be a problem. Keep in mind that vdev performance
is driven by the slowest device in the vdev. If you have multiple
vdevs then overall performance is improved by putting similar
performance devices in each vdev since zfs will load-share across
them, taking current requests, observed performance, and how full the
vdev is into account.
Bob
--
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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