On 07/10/11 04:04 AM, Edward Ned Harvey wrote:
There were a lot of useful details put into the thread "Summary: Dedup
and L2ARC memory requirements"
Please refer to that thread as necessary... After much discussion
leading up to that thread, I thought I had enough understanding to
make dedup useful, but then in practice, it didn't work out. Now I've
done a lot more work on it, reduced it all to practice, and I finally
feel I can draw up conclusions that are actually useful:
I am testing on a Sun Oracle server, X4270, 1 Xeon 4-core 2.4Ghz, 24G
ram, 12 disks ea 2T sas 7.2krpm. Solaris 11 express snv_151a
Can you provide more details of your tests? I'm currently testing a
couple of slightly better configured X4270s (2 CPU, 96GB RAM and a FLASH
accelerator card) using real data from an existing server. So far, I
haven't seen the levels of performance fall off you report.
I currently have about 5TB of uncompressed data in the pool (stripe of 5
mirrors) and throughput is similar to the existing, Solaris 10,
servers. The pool dedup ratio is 1.7, so there's a good mix of unique
and duplicate blocks.
--
Ian.
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