I know some others may already have pointed this out - but I can't see
it and not say something...
Do you realise that losing a single disk in that pool could pretty much
render the whole thing busted?
At least for me - the rate at which _I_ seem to lose disks, it would be
worth considering something different ;)
Cheers!
Nathan.
On 12/19/11 09:05 AM, Jan-Aage Frydenbø-Bruvoll wrote:
Hi,
On Sun, Dec 18, 2011 at 22:00, Fajar A. Nugraha<w...@fajar.net> wrote:
From http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide
(or at least Google's cache of it, since it seems to be inaccessible
now:
"
Keep pool space under 80% utilization to maintain pool performance.
Currently, pool performance can degrade when a pool is very full and
file systems are updated frequently, such as on a busy mail server.
Full pools might cause a performance penalty, but no other issues. If
the primary workload is immutable files (write once, never remove),
then you can keep a pool in the 95-96% utilization range. Keep in mind
that even with mostly static content in the 95-96% range, write, read,
and resilvering performance might suffer.
"
I'm guessing that your nearly-full disk, combined with your usage
performance, is the cause of slow down. Try freeing up some space
(e.g. make it about 75% full), just tot be sure.
I'm aware of the guidelines you refer to, and I have had slowdowns
before due to the pool being too full, but that was in the 9x% range
and the slowdown was in the order of a few percent.
At the moment I am slightly above the recommended limit, and the
performance is currently between 1/10000 and 1/2000 of what the other
pools achieve - i.e. a few hundred kB/s versus 2GB/s on the other
pools - surely allocation above 80% cannot carry such extreme
penalties?!
For the record - the read/write load on the pool is almost exclusively WORM.
Best regards
Jan
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