running mksnap_ffs

[Kris Kennaway]

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???

Yes :) Snapshots were not designed for use in this way (they were
designed to support background fsck and allow faster system recovery
after power failure), so they don't scale as well as you might like on
large filesystems.

Kris
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