On Sep 15, 2009, at 1:03 PM, Dale Ghent wrote:
On Sep 10, 2009, at 3:12 PM, Rich Morris wrote:
On 07/28/09 17:13, Rich Morris wrote:
On Mon, Jul 20, 2009 at 7:52 PM, Bob Friesenhahn wrote:
Sun has opened internal CR 6859997. It is now in Dispatched
state at High priority.
CR 6859997 has recently been fixed in Nevada. This fix will also
be in Solaris 10 Update 9.
This fix speeds up the sequential prefetch pattern described in
this CR without slowing down other prefetch patterns. Some kstats
have also been added to help improve the observability of ZFS file
prefetching.
Awesome that the fix exists. I've been having a hell of a time with
device-level prefetch on my iscsi clients causing tons of ultimately
useless IO and have resorted to setting zfs_vdev_cache_max=1.
This only affects metadata. Wouldn't it be better to disable
prefetching for data?
-- richard
Question though... why is bug fix that can be a watershed for
performance be held back for so long? s10u9 won't be available for
at least 6 months from now, and with a huge environment, I try hard
not to live off of IDRs.
Am I the only one that thinks this is way too conservative? It's
just maddening to know that a highly beneficial fix is out there,
but its release is based on time rather than need. Sustaining really
needs to be more proactive when it comes to this stuff.
/dale
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