On Feb 12, 2007, at 8:05 AM, Robert Petkus wrote:
Some comments from the author:
1. It was a preliminary scratch report not meant to be exhaustive
and complete by any means. A comprehensive report of our findings
will be released soon.
2. I claim responsibility for any benchmarks gathered from Thumper
and the Linux/FASST/ZFS configuration. Any metrics regarding the
"Jackrabbit" SI system was provided by others and simply graphed by
myself.
3. We didn't have the evaluation unit for long. However, I did
have time to test Thumper configured with both Solaris 10 u2 and
Fedora Core 6 Linux (both ext3 and xfs) running iozone, fileop,
nfs, dcache, and gridftp. Comparative results will be in the next
report.
4. Why didn't I upgrade to S10U3? Time mostly. Plus it was not
clear, at least to me, that u3 offered much in the way of
performance gain in our configuration. U3 seemed more of a feature
upgrade -- (http://www.cuddletech.com/blog/pivot/entry.php?id=777 --
> ZFS Command Improvements and Changes, including RAIDZ-2, Hot-
Spares, Recursive Snapshots, Promotion of Clones, Compact NFSv4
ACL's, Destroyed Pools Recovery, Error Clearing, ZFS integration
with FMA). Correct me if I'm wrong; i.e., what would we have
gained performance-wise using U3 in our configuration?
RAIDZ-2 would have been a fair comparison to RAID-6 (which was used
on the JackRabbit linux config).
I'd have to look closer into how iozone does its writes, but the re-
write tests could be hurt in s10u2, but fixed in s10u3 by:
6424554 full block re-writes need not read data in
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6424554
The prefetching code was improved in s10u3 via:
6447377 ZFS prefetch is inconsistant
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6447377
Depending on the workload, this bug may have been in play as well:
6440499 zil should avoid txg_wait_synced() and use dmu_sync() to
issue parallel IOs when fsyncing (INT snv_43, S10_U3):
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6440499
eric
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