running mksnap_ffs

[Willem Jan Withagen]

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?

--WjW