Status update - ZFS "stalls" and other misbehavior
karl at denninger.net
Sun Sep 14 15:08:04 UTC 2014
Those of you who have seen misbehavior of various sorts while running
-STABLE w/ZFS filesystems may want to check out the developments in this
thread on Bugzilla.
Work has continued on the candidate patch I posted back in March, and I
recently put forward an updated version incorporating changes made by
Steve as well that, at least in my testing and (thus far) on one
production system here, have completely eliminated the problem.
More eyes looking at it and running it down are obvious better so if you
have an interest in this issue or have had problems in this area
(/*especially*/ if you have had system "stalls") please check it out.
Those who are using my previous patch from back in March definitely want
to look at this; while the March changes did largely fix the issue they
did so by moving the "danger zone" further out but did not prevent the
ZFS code from invading system RAM to the point that it could produce
stalls -- it just made it much less likely. The most-recent patch, as
far as I've been able to determine, completely prevent it even when the
system is severely overstressed in terms of demanded I/O rate or when
the target pool is compromised (e.g. during a resilver operation.)
karl at denninger.net <mailto:karl at denninger.net>
/The Market Ticker/
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