running mksnap_ffs

Kostik Belousov kostikbel at gmail.com
Wed Jan 3 02:40:03 PST 2007


On Wed, Jan 03, 2007 at 12:05:26AM +0100, Willem Jan Withagen wrote:
> Gary Palmer wrote:
> >On Tue, Jan 02, 2007 at 09:06:24PM +0100, Willem Jan Withagen wrote:
> >>Hi,
> >>
> >>I got the following Filesystem:
> >>Filesystem    Size    Used   Avail Capacity iused     ifree %iused 
> >>/dev/da0a     1.3T    422G    823G    34%  565952 182833470    0%
> >>
> >>Running of a 3ware 9550, on a dual core Opteron 242 with 1Gb.
> >>The system is used as SMB/NFS server for my other systems here.
> >>
> >>I would like to make weekly snapshots, but manually running mksnap_ffs 
> >>freezes access to the disk (I sort of expected that) but the process 
> >>never terminates. So I let is sit overnight, but looking a gstat did not 
> >>reveil any activity what so ever...
> >>The disk was not released, mksnap_ffs could not be terminated.
> >>And things resulted in me rebooting the system.
> >>
> >>So:
> >> - How long should I expect making a snapshot to take:
> >>	5, 15, 30min, 1, 2 hour or even more???
> >> - How do I diagnose the reason why it is not terminating?
> >
> >You forgot to mention what revision of FreeBSD you are running, and
> >if you are using quotas or anything else on the filesystem that
> >could impact this.
> 
> Yes, I pressed send somewhat to fast:
> 
> [~] wjw at bigsurf> uname -a
> FreeBSD bigsurf.digiware.nl 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #3: Wed 
> Sep 27 15:57:20 CEST 2006     
> wjw at bigsurf.digiware.nl:/usr/obj/usr/src/sys/BIGSURF amd64

See
http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html
for instruction how to gather information needed to debug the problem.
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