On 9/19/2011 9:40 AM, Edward Ned Harvey wrote:
From: [email protected] [mailto:[email protected]]
On Behalf Of Doug Hughes
The biggest WIN for ZIL is NFS workloads with lots of small files and
This is also the biggest win, for disabling the ZIL completely. ;-)
Also, on your NFS clients, add the "async" NFS mount option.
Very few NFS servers are servicing clients which cannot accept the risk
introduced by disabling ZIL. If your server crashes, some stale NFS file
handles linger on some clients. I've never seen them cause harm (beyond
whatever you normally expect whenever your NFS server crashes) but
eventually you'll reboot your client or dismount/remount, and at that time,
they will disappear.
I have tended to subscribe to the more cautionary advice still
espoused by the ZFS Evil Tuning guide:
http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Disabling_the_ZIL_.28Don.27t.29
In particular:
"Caution: Disabling the ZIL on an NFS server can lead to client side
corruption. the ZFS pool integrity itself is not compromised by this
tuning."
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