System hanging during dump
koitsu at FreeBSD.org
Wed Oct 15 02:08:51 PDT 2008
On Wed, Oct 15, 2008 at 07:58:43PM +1100, Peter Jeremy wrote:
> On 2008-Oct-15 01:35:38 -0700, Jeremy Chadwick <koitsu at 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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