Fwd: dump hangs on 7.1

[Balázs Mátéffy]

Hi,

I had a similar error with 7.0, and found reference that there was
problem(as far as I can remember there was an issue with large disk I/O and
creating snapshots on the partition).
Dump was creating the files, and it hanged, sometimes it finishes like once
in ten for small partitions. Every time hangs at pass 4, but for me
sometimes it was unable to get back to the shell with ctrl + c, I had to
close my ssh session, but I could fine the dump session in ps -ax.

I had the generic kernel, and I user freebsd-update to update to 7.2, now
it's working like a charm!

Because you don't have dump, please backup your system with another utility
before even thinking about the update, or you can still wait for the others
to tell you something useful.

Maybe some vmstat / gstat detail could be helpful to look up the resource
usage when dump hangs?

Best Regards,

Balázs.



2009/7/12 Len Conrad <LConrad at go2france.com>


> >On Friday 10 July 2009 08:29:01 Len Conrad wrote:
> >> FreeBSD 7.1-RELEASE #0: Thu Jan  1 14:37:25 UTC 2009
> >> root at logan.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
> >>
> >> CPU: Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz (2496.26-MHz
> 686-class
> >> CPU) Origin = "GenuineIntel"  Id = 0x1067a  Stepping = 10
> >>   AMD Features=0x20100000<NX,LM>
> >>   AMD Features2=0x1<LAHF>
> >>   Cores per package: 4
> >> real memory  = 3484745728 (3323 MB)
> >> avail memory = 3405537280 (3247 MB)
> >> ACPI APIC Table: <DELL   PE_SC3  >
> >> FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
> >>  cpu0 (BSP): APIC ID:  0
> >>  cpu1 (AP): APIC ID:  1
> >>  cpu2 (AP): APIC ID:  2
> >>  cpu3 (AP): APIC ID:  3
> >>
> >>
> >> /sbin/dump -0uanL -f - / | ssh dump_images at xxx.net dd
> >> of=/var/ftp/dump_images/mx1-root-test
> >>
> >> dump has completed only once. Several other dumps have all gotten under
> >> way, target file is created and increases until the hang.
> >>
> >> CTRL-C gets back to shell,eg:
> >>
> >>   DUMP: Date of this level 0 dump: Fri Jul 10 10:25:33 2009
> >>   DUMP: Date of last level 0 dump: the epoch
> >>   DUMP: Dumping snapshot of /dev/da0s1d (/usr) to standard output
> >>   DUMP: mapping (Pass I) [regular files]
> >>   DUMP: mapping (Pass II) [directories]
> >>   DUMP: estimated 1713942 tape blocks.
> >>   DUMP: dumping (Pass III) [directories]
> >>   DUMP: dumping (Pass IV) [regular files]
> >> ^C  DUMP: Interrupt received.
> >>   DUMP: Do you want to abort dump?: ("yes" or "no") Killed by signal 2.
> >>   DUMP: Broken pipe
> >>   DUMP: The ENTIRE dump is aborted.
> >>
> >> Hangs always in Pass IV
> >
> >What's the output ps -auwwx|grep dump at the time of the dump.
>
> when the dump hangs:
>
> ps auxww | grep dump
>
> root    61360  0.0  0.0  3128  1168  p0  I+    1:47PM   0:00.06 /sbin/dump
> -0uanL -f - / (dump)
>
> root    61361  0.0  0.1  5560  2768  p0  I+    1:47PM   0:03.65 ssh
> xxx at xxx.net dd of=/var/ftp/dump_images/mx1-root-test
>
> root    61364  0.0  0.0  3128  1528  p0  I+    1:47PM   0:00.36 dump:
> /dev/da0s1a: pass 4: 92.66% done, finished in 0:00 at Sun Jul 12 13:47:52
> 2009 (dump)
>
> root    61365  0.0  0.0  3128  1184  p0  I+    1:47PM   0:00.29 /sbin/dump
> -0uanL -f - / (dump)
>
> root    61366  0.0  0.0  3128  1184  p0  I+    1:47PM   0:00.29 /sbin/dump
> -0uanL -f - / (dump)
>
> root    61367  0.0  0.0  3128  1184  p0  I+    1:47PM   0:00.29 /sbin/dump
> -0uanL -f - / (dump)
>
> root    61382  0.0  0.0  1660   900  p1  R+    1:48PM   0:00.00 grep dump
>
> ========
>
> btw, with dump and dar failing, I tried rdiff-backup which succeeded.
>
> Thanks
> Len
>
>
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