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.
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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