Vahid Moghaddasi wrote:
Thank you all for reply. I will do the recommendation and see if there
is any change in performance.
I had seen the documents in the link but I needed to make sure that we
can not do anything to improve the performance before going to storage
guys.
You may not have much choice, actually. Recently, I was involved with a
large proof-of-concept where the "requirement" was hardware RAID-5.
After spending months proving it wouldn't scale, we finally convinced
the powers-that-be to make the critical LUNs mirrors. Afterwards, it scaled
rather nicely. Moral: you can spend a lot of efforts trying to put
lipstick on
a pig, and tune databases or ZFS to the max, but in the end, mirrors will
always kick butt over RAID-5.
-- richard
Thanks again,
Vahid.
On Tue, Mar 3, 2009 at 9:44 PM, David Magda <dma...@ee.ryerson.ca
<mailto:dma...@ee.ryerson.ca>> wrote:
On Mar 3, 2009, at 20:51, Richard Elling wrote:
This seems unusual, unless the EMC is mismatched wrt how they
may have
implemented cache flush. The issues around this are described
in the Evil
Tuning Guide
http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Cache_Flushes
Under the 5/08 and snv_72 note, the following text appears:
The sd and ssd drivers should properly handle the SYNC_NV bit,
so no changes should be needed.
I'm assuming this relates to:
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6462690
So the caching-flushing scenario shouldn't be a problem with newer
Solaris releases on higher-end arrays (assuming they support
SBC-2's SYNV_NV).
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