Snapshot problems

[Eric Anderson]

Skylar Thompson wrote:
> I've discovered a repeatable problem with FreeBSD's UFS2 snapshots. If I
> create several snapshots, and then do heavy disk I/O on the original
> filesystem (deletions, creations, simple touches, etc.) I can cause the I/O
> system to crash. There is no kernel panic, and the machine still answers
> pings, but no disk I/O occurs. I can replicate this on a dual-processor
> beige-box system with a Mylex RAID controller and a RAID-5 set, and also on
> a dual-processor Dell Poweredge 2650 with a PERC 3/i RAID controller and a
> RAID-5 set and RAID-1 set.  FreeBSD 5.4-RELEASE is installed on both
> systems, and SMP is enabled as well, with HTT disabled on the Poweredge. I
> have DDB compiled in, so I can get debug information but I don't know what
> to look for.

If you are able to get into the debugger, can you get a backtrace?  Also 
- you might want to send this to freebsd-stable@, try upgrading to 
-stable, or try installing 6-CURRENT and see if the problem exists there 
(if that's an option).

Eric



-- 
------------------------------------------------------------------------
Eric Anderson        Sr. Systems Administrator        Centaur Technology
A lost ounce of gold may be found, a lost moment of time never.
------------------------------------------------------------------------