ZFS performance bottlenecks: CPU or RAM or anything else?
Bob Friesenhahn
bfriesen at simple.dallas.tx.us
Wed May 18 13:49:42 UTC 2016
On Wed, 18 May 2016, Alex Tutubalin wrote:
>
> If so, raidz will have huge write performance benefit in my case: single
> write of one large file.
This is not proven in practice. With mirrors one typically has more
vdevs and each vdev gets a zfs block-size write in turn, using a
round robin agorithm (tuned for available space vdev). Drive IOPs are
saved since the blocks are not diced into smaller fragments (as raidzN
requires). With raidz it is necessary to also pay the cost of the
parity computations, which are not needed with mirroring.
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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