Date: Wed, 20 Jun 2007 20:02:09 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Espen Skoglund <esk@ira.uka.de> Cc: freebsd-fs@freebsd.org Subject: Re: Snapshot usage guidelines (to avoid stability issues) Message-ID: <20070620170209.GY2268@deviant.kiev.zoral.com.ua> In-Reply-To: <20070620165746.GX2268@deviant.kiev.zoral.com.ua> References: <18041.21810.297355.202403@gargle.gargle.HOWL> <20070620165746.GX2268@deviant.kiev.zoral.com.ua>
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--QfPW8fNxh+WKMpMU Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jun 20, 2007 at 07:57:46PM +0300, Kostik Belousov wrote: > On Wed, Jun 20, 2007 at 06:26:26PM +0200, Espen Skoglund wrote: > > Hi, > >=20 > > 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. > >=20 > > 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. > >=20 > > 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. > >=20 > > 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_snapshot.= c. >=20 > If it is less then 1.103.2.24, see developers handbook for instruction on shall be "equal to 1.103.2.24" > reporting deadlocks. >=20 --QfPW8fNxh+WKMpMU Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFGeV2QC3+MBN1Mb4gRAqlQAJ0ZYgIE+XLOWMzQrsfgDhphwXBQiACgjebD SV3Ga92+mDnqApRLi5vYLRw= =TnPy -----END PGP SIGNATURE----- --QfPW8fNxh+WKMpMU--
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