ZFS raid write performance?
Bob Friesenhahn
bfriesen at simple.dallas.tx.us
Mon Jun 22 18:58:23 UTC 2015
On Mon, 22 Jun 2015, kpneal at pobox.com wrote:
> Reading and writing to a raidz* requires touching all or almost all of
> the disks.
>
> Writing to a mirror requires touching all the disks. Reading from a mirror
> requires touching one disk.
Keep in mind that for the same number of disks, using mirrors results
in more vdevs and less use of precious IOPS. Also, using mirrors
results in larger I/O requests since zfs blocks don't need to be
fragmented.
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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