Jens Elkner writes:
> Currently I'm trying to figure out the best zfs layout for a thumper wrt. to
> read AND write performance.
>
> I did some simple mkfile 512G tests and found out, that per average ~
> 500 MB/s seems to be the maximum on can reach (tried initial default
> setup, all 46 HDDs as R0, etc.).
>
That might be a per pool limitation due to
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6460622
This performance feature was fixed in Nevada last week.
Workaround is to create multiple pools with fewer disks.
Also this
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6415647
is degrading a bit the perf (guesstimate of anywhere up to
10-20%).
-r
> According to
> http://www.amd.com/us-en/assets/content_type/DownloadableAssets/ArchitectureWP_062806.pdf
> I would assume, that much more and at least in theory a max. ~ 2.5
> GB/s should be possible with R0 (assuming the throughput for a single
> thumper HDD is ~ 54 MB/s)...
>
> Is somebody able to enlighten me?
>
> Thanx,
> jel.
>
>
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