Date: Thu, 23 Mar 2006 16:39:41 -0500 From: Kris Kennaway <kris@obsecurity.org> To: Julien Gabel <julien.gabel@thilelli.net> Cc: Eugene <genie@geniechka.ru>, freebsd-fs@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: UFS2 Snapshots in 6.1-Beta4 - Confirmed Problems. Message-ID: <20060323213941.GA88109@xor.obsecurity.org> In-Reply-To: <50319.192.168.1.101.1143148607.squirrel@webmail.thilelli.net> References: <20060322120033.E5B8916A44B@hub.freebsd.org> <007801c64eb9$3db4c050$1b12c055@genie> <50319.192.168.1.101.1143148607.squirrel@webmail.thilelli.net>
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On Thu, Mar 23, 2006 at 10:16:47PM +0100, Julien Gabel wrote: > > While we're on the topic of snapshots, I recently posted this follow-up to > > the PR kern/66270 "[hang] dump causes machine freeze" > > >> I wonder what is the status of this PR? > >> I seem to have the same problem with 5.3-RELEASE. > >> > >> Before this started, system worked nicely for more than a year and then > >> it > >> started to hang during dump (seemingly just after mksnap_ffs) first > >> intermittently and now reproducibly (might increase in data size be a > >> factor? though disk is only about 18% full). > >> Originally it hanged and console had complains about increasing > >> PMAP_SHPGPERPROC and maxproc. > >> After some talk in freebsd-fs, I adjusted these parameters and now it > >> just hangs without complaining =(( > >> > >> Any suggestions? > > > In addition to this PR, I found a couple of similar threads in different > > lists but they all just have some initial talk and preliminary analysis, > > and then it just stops. Was that snapshot problem fixed or is it the same > > as we are talking now? I can't believe I am the only one in almost 2 > > years who is (trying to be) doing automated backups... > > So, if it was fixed, when (which version)? If not, then when it might be > > and -- in the meantime -- is there any workaround for backups? (The system > > is the production server on the colocation so doing backups in single-user > > mode is not practical). > > Interesting. I used dump/restore without problem on i386 using a file > system of 120Go. I swiched two weeks ago on amd64 using a file system of > 260Go and encountered the very same behaviour (hang, freeze). Don't know > if it is related to the new processor architecture or the bigger fs size, > but i didn't observe this hang on smallest file system before. > > Because i am a big fan of dump, i currently choose to use it without the > '-L' switch, back to the old (classical?) behaviour, i.e. not doing a > snapshot before doing the dump. It is always better than not having > complete system backup at all (YMMV, though). > > I am currently running 6.1-PRERELEASE build Wed Mar 22 03:55:42 CET 2006. Let us know if it recurs with your updated kernel. Kris
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