Date: Mon, 27 Jun 2005 08:18:26 -0500 From: Eric Anderson <anderson@centtech.com> To: Skylar Thompson <skylar@cs.earlham.edu> Cc: fs@freebsd.org Subject: Re: Snapshot problems Message-ID: <42BFFCA2.1060206@centtech.com> In-Reply-To: <20050626182031.GA5268@quark.cs.earlham.edu> References: <20050626182031.GA5268@quark.cs.earlham.edu>
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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. ------------------------------------------------------------------------
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