System hanging during dump

Peter Jeremy peterjeremy at
Wed Oct 15 01:58:47 PDT 2008

On 2008-Oct-15 01:35:38 -0700, Jeremy Chadwick <koitsu at> 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.

No, my problem is not mentioned in your Wiki.  You mention:
* dump process frequently hangs
  In my case, the dump was progressing normally.  The _rest_ of the
  system was hung.

* 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.

* Filesystems not cleanly shut down if reboot performed while dump(8) still running
  Not applicable.

Peter Jeremy
Please excuse any delays as the result of my ISP's inability to implement
an MTA that is either RFC2821-compliant or matches their claimed behaviour.
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