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Date: Sun, 18 Mar 2007 17:34:55 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Garrett Cooper <youshi10@u.washington.edu>
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Cc: Drew Jenkins <drewjenkinsjr@yahoo.com>, freebsd-questions@freebsd.org
Subject: Re: Corrupted OS
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On Sat, 17 Mar 2007 13:09:12 -0700 Garrett Cooper wrote:
 > Drew Jenkins wrote:
 > > /etc/fstab says ufs. Is there a better way to check if its ufs2?
 > > Drew2
 > > 
 > > Garrett Cooper <youshi10@u.washington.edu> wrote: On Mar 16, 2007, at 7:34 PM, Drew Jenkins wrote:
 > > 
 > >> How large is "large"? Why filesystem are you using with what  
 > >> options?The MySQL database was just under a gigabyte, and the Zope  
 > >> Data.fs file/database was somewhere under 2 gigabytes. Options? No  
 > >> options. I had symlinks from where these dbases were supposed to  
 > >> live on the SCSI drives to the 500 GB drive. Then suddenly, poof!  
 > >> They were gone.
 > >> Drew
 > > 
 > > Well, I was curious because I thought it could be something to deal  
 > > with the 2GB file limit. You still haven't answered my question about  
 > > the filesystem though: are you using UFS2 or something else?
 > > 
 > > Thanks,
 > > -Garrett
 > 
 > The easiest way to figure out if you're running UFS2 is to go to the 
 > disk label feature within sysinstall, and define a mount point for the 
 > slice. Make sure _not_ to make any changes though as you'll be thrusting 
 > yourself in the middle of a system upgrade (CTRL-C is your friend).

Perhaps even a bit easier:

paqi% dumpfs /dev/ad0s2a | head -1
magic   19540119 (UFS2) time    Sun Mar 18 15:48:35 2007

Also, 'dumpfs <device> | head -20' provides far more than anyone wants
to know but including maxfilesize, flags (eg none or soft-updates) and
fsmnt (last mounted on).  Works on unmounted or mounted drives.

Cheers, Ian