Date: Thu, 21 Jun 2007 12:03:33 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Cristian KLEIN <cristi@net.utcluj.ro> Cc: freebsd-fs@freebsd.org, Espen Skoglund <esk@ira.uka.de> Subject: Re: Snapshot usage guidelines (to avoid stability issues) Message-ID: <20070621090333.GA2268@deviant.kiev.zoral.com.ua> In-Reply-To: <4679AE0C.5040306@net.utcluj.ro> References: <18041.21810.297355.202403@gargle.gargle.HOWL> <20070620165746.GX2268@deviant.kiev.zoral.com.ua> <4679AE0C.5040306@net.utcluj.ro>
next in thread | previous in thread | raw e-mail | index | archive | help
--Vwd26Opu41siI++W Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jun 21, 2007 at 01:45:32AM +0300, Cristian KLEIN wrote: > Kostik Belousov wrote: > > On Wed, Jun 20, 2007 at 06:26:26PM +0200, Espen Skoglund wrote: > >> Hi, > >> > >> A couple of days ago I decided to start using snapshots on my system. > >> Knowing that the functionality has been available for quite some time > >> now I (apparently wrongly) assumed that it was ready for production > >> use. My bad. > >> > >> My system, a 6-STABLE from week and a half ago, uses two 250GB > >> gstriped disks and has about 4-5 snapshots on one 215GB UFS partiton. > >> This morning I learned that things had gone terribly wrong during some > >> nightly cronjobs, hanging the whole system. Suspecting that snapshots > >> were the culprit I soon learned after some investigation that the > >> snapshot functionality wasn't nearly as stable as I had hoped for. > >> > >> Looking at PRs and mailing lists there seems to be mainly two > >> outstanding stability issues with snapshots: a) snapshotted fs running > >> full, and b) deleting large amount of files on an fs with multiple > >> snapshots. The former issue, while certainly annoying, one could be > >> able to work around. The latter issue, on the other hand, seems more > >> like a definite show stopper. > >> > >> Am I right in inferring that the two above cases are main issues with > >> snaphots at this time, or are there other known gotchas that I have to > >> look out for. > > About the issue b). Are you system sources before or after 2007-06-11 > > 10:53:48 UTC ? Or simply show me the version of sys/ufs/ffs/ffs_snapsho= t.c. > >=20 > > If it is less then 1.103.2.24, see developers handbook for instruction = on > > reporting deadlocks. > >=20 >=20 > Do you think that 1.103.2.24 might solve this > http://lists.freebsd.org/pipermail/freebsd-fs/2007-May/003161.html ? I very much doubt it. AFAIR, I asked at least ddb backtrace for the crash, and you did not answered. --Vwd26Opu41siI++W Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFGej7kC3+MBN1Mb4gRAifUAJ46RwdwbsbAWtavTgZpb7NzC2psPQCgqLny 0G0/tpm9ALfalyHgHAYr3WY= =3+qz -----END PGP SIGNATURE----- --Vwd26Opu41siI++W--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20070621090333.GA2268>