[Gluster-users] GlusterFS Benchmarks

[Joe Landman]

On 05/04/2011 03:14 AM, Aleksanyan, Aleksandr wrote:
> I test GlusterFS on this equipment:

[...]

> Max Write: 1720.80 MiB/sec (1804.39 MB/sec)
> Max Read: 1415.64 MiB/sec (1484.40 MB/sec)

hmmm ... seems low.  With 24 bricks we were getting ~10+ GB/s 2 years 
ago on the 2.0.x series of code.  You might have a bottleneck somewhere 
in the Fibre channel portion of things.

> Run finished: Tue Oct 19 09:30:34 2010
> Why *read *< *write* ? It's normal for GlusterFS ?

Its generally normal for most cluster/distributed file systems that have 
any sort of write caching (RAID, brick OS write cache, etc.)

You can absorb the write into cache (16 units mean only 10GB ram 
required per unit to cache), and commit it later.

When we do testing on our units, we recommend using data sizes that far 
exceed any conceivable cache.  We regularly do single machine TB sized 
reads and writes (as well as cluster storage reads and writes in the 
1-20TB region) as part of our normal testing regimen.  We recommend 
reporting the non-cached performance numbers as that is what users will 
often see (as a nominal case).

Regards

Joe

-- 
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics, Inc.
email: landman at scalableinformatics.com
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