[Lustre-devel] [Lustre-discuss] ZFS/DMU benchmarks
garlick at llnl.gov
Wed Nov 14 16:14:32 PST 2007
It would also be nice to see the tests repeated on Linux on the same
hardware. (Obviously not the kernel ZFS stuff though!)
p.s. I should add that the efforts at Livermore to test the ZFS/PIOS
stuff are on hold until we can get 1.6.2 stablized at scale for
our production environment, likely another two months. Sorry we were
not of more help.
On Wed, 14 Nov 2007, Jody McIntyre wrote:
> Hi Ricardo,
> On Tue, Nov 13, 2007 at 11:48:38AM +0000, Ricardo Correia wrote:
>> Here are some current ZFS/DMU benchmark results that might be of
>> interest to you.
> It's nice to see these results - thanks for posting them. When you have
> time, could you do a comparison with Lustre 1.6.x on ldiskfs + software
> RAID 5? It would be good to know how ZFS stands up (probably quite
> favourably, even at this early stage.)
>> These results were obtained on a Sunfire x4500 with these specifications:
>> - 2 dual-core AMD Opteron processors
>> - 16 GB main memory
>> - 48 SATA II HDD (7200 RPM, 500 GB each)
>> - Solaris 10 update 3
>> - Userspace DMU from OpenSolaris build 74
>> The tool used in this particular benchmark was PIOS, which simulates a
>> parallel I/O load typically experienced by an OSS. Since PIOS links
>> directly with the DMU, it should give a good estimation of the maximum
>> throughput of the userspace DMU-OSS. For comparison, you can also see
>> the results of running the same PIOS benchmark with normal POSIX I/O on
>> the Solaris 10u3 ZFS implementation.
>> See the attached PDF for the results.
>> First page provides PIOS throughput information on striped pools with
>> 10, 24 and 46 disks. uDMU outperforms kernel ZFS with 10 disks, however,
>> the kernel ZFS implementation scales better to 24 and 46 disks.
>> Surprisingly enough, disabling checksums has a negative impact on the
>> throughput with a 10-disk striped pool. This impact can be attributed to
>> the differences in the uDMU IO pipeline which are probably causing the
>> IOs to not being parallelized when checksumming is disabled. This issue,
>> however, should not be hard to fix.
>> Second page shows the results of running PIOS on RAID-Z, RAID-Z2 and
>> mirrored pools. In these configurations, the kernel ZFS currently has a
>> better throughput than the userspace DMU.
>> These results were obtained with only minimal tuning of the DMU (setting
>> a maximum cache size and increasing the number of I/O threads). Work is
>> already underway to improve the performance of the DMU and we expect to
>> see better throughput in the coming months.
>> Best regards,
>> <http://www.sun.com> * Ricardo Manuel Correia *
>> Lustre Engineering Group
>> *Sun Microsystems, Inc.*
>> Ricardo.M.Correia at Sun.COM
>> Lustre-discuss mailing list
>> Lustre-discuss at clusterfs.com
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