Date: Tue, 21 Mar 2006 14:49:04 -0500 From: Kris Kennaway <kris@obsecurity.org> To: John Kozubik <john@kozubik.com> Cc: freebsd-fs@freebsd.org, jroberson@chesapeake.net, freebsd-current@freebsd.org, tegge@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: UFS2 Snapshots in 6.1-Beta4 - Confirmed Problems Message-ID: <20060321194904.GA20959@xor.obsecurity.org> In-Reply-To: <20060321113923.I55763@kozubik.com> References: <20060320224313.O55763@kozubik.com> <20060321184127.GA19204@xor.obsecurity.org> <20060321113923.I55763@kozubik.com>
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--cWoXeonUoKmBZSoM Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Mar 21, 2006 at 11:40:44AM -0800, John Kozubik wrote: >=20 >=20 > On Tue, 21 Mar 2006, Kris Kennaway wrote: >=20 > > > 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. >=20 >=20 > 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. >=20 > Is that true ? Can I skip a few hours of trying to reproduce this ? Yes, I'm easily able to reproduce it, and I'm told that fixing it will require fairly extensive work & testing. Kris --cWoXeonUoKmBZSoM Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (FreeBSD) iD8DBQFEIFivWry0BWjoQKURAhtMAKCPf9EejvGpZ1a3nl2ou2dkEQCeKgCgzswY zBBpyed8lGzCvRrzD0aDltg= =fHvo -----END PGP SIGNATURE----- --cWoXeonUoKmBZSoM--
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