Date: Tue, 21 Mar 2006 11:40:44 -0800 (PST) From: John Kozubik <john@kozubik.com> To: Kris Kennaway <kris@obsecurity.org> Cc: freebsd-fs@freebsd.org, jroberson@chesapeake.net, freebsd-current@freebsd.org, tegge@freebsd.org Subject: Re: UFS2 Snapshots in 6.1-Beta4 - Confirmed Problems Message-ID: <20060321113923.I55763@kozubik.com> In-Reply-To: <20060321184127.GA19204@xor.obsecurity.org> References: <20060320224313.O55763@kozubik.com> <20060321184127.GA19204@xor.obsecurity.org>
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On Tue, 21 Mar 2006, Kris Kennaway wrote: > > This next one is complicated, and I haven't submitted a PR for it yet, but > > I believe it is quite serious for reasons I will expand on below. > > > > The problem is: If you completely fill a filesystem (109% usage in `df` > > on most systems) that has a snapshot on it, the system becomes very > > unresponsive - all interactive and disk response lags terribly and, > > although the system is not hung, it is in many cases unusable. > > Yes :-( This will probably not be fixable in time for 6.1, but > hopefully it will be addressed in the future. FYI, the system may > also panic in this situation. Because my original description of this behavior was so vague, I was going to try to reproduce it again with more details, however it sounds like you have already witnessed this and know more about it than I do. Is that true ? Can I skip a few hours of trying to reproduce this ? ----- John Kozubik - john@kozubik.com - http://www.kozubik.com
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