Date: Wed, 15 Oct 2008 02:08:48 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Peter Jeremy <peterjeremy@optushome.com.au> Cc: freebsd-stable@FreeBSD.org Subject: Re: System hanging during dump Message-ID: <20081015090848.GA72852@icarus.home.lan> In-Reply-To: <20081015085843.GF26536@server.vk2pj.dyndns.org> References: <20081015082428.GE26536@server.vk2pj.dyndns.org> <20081015083538.GA72190@icarus.home.lan> <20081015085843.GF26536@server.vk2pj.dyndns.org>
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On Wed, Oct 15, 2008 at 07:58:43PM +1100, Peter Jeremy wrote: > On 2008-Oct-15 01:35:38 -0700, Jeremy Chadwick <koitsu@FreeBSD.org> wrote: > >On Wed, Oct 15, 2008 at 07:24:28PM +1100, Peter Jeremy wrote: > >> Last night, I attempted a full, compressed backup of my 181GB /home > >> (on a PATA disk) to a remote system. The backup started at 2159 and > >> everything appeared normal until about 0040 when the system became > >> non-responsive and this lasted until the dump completed at 1033. This > >> is the first full backup of /home I've made for several years (due to > >> lack of space). > ... > >It's a known problem documented in my Wiki -- see "dump/restore". Note > >the part about UFS2 snapshot generation. I'm almost certain this is > >what you're describing. > > * UFS2 snapshot generation (mksnap_ffs, dump -L) takes too long; system is unusable during this time > In my case, snapshot creation took ~4 minutes. The system was > running normally for 2.6 hours after snapshot creation completed > before it froze. Did you read the References, including the one from myself? Snapshot generation in some cases took only minutes, but *removal* of the generated the snapshot took 1.5 hours or more, hanging the system until the removal was complete. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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