System hanging during dump

[Peter Jeremy]

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.

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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