Hi, Pierre, On Wed, Jun 08, 2005 at 02:31:37PM +0200, Pierre DAVID wrote: > Hi, > > we are setting up a mail server for ~50 000 users, with around 1.8TB > on a DAS storage (HP MSA 500). > > We were planning to use FreeBSD (5.4-RELEASE), as with all other > servers in our machine room. > > However, we are encountering a show stopper: after an unclean > shutdown, the snapshot that fsck creates is taking too much time > (more than 20 minutes). During the most part of this time, all I/O > are frozen on this large disk, so the server cannot serve our > clients. Our SLA constraints do not allow us to have these recovery > times.
Would you please provide a bit more of information so we can investigate
what was happening, like:
- first few lines dumpfs(8) output from your storage filesystem
- df -i on your storag filesystem
- dmesg.boot from your /var/run
I think the delay is too long. Taking a snapshot on a large volume
is slow, but should not be that slow :-) We run similiar mail server
at company, but with ~10x of users and 2x storage (divided into two
RAID groups). Hope I would be able to provide some help.
Cheers,
--
Xin LI <delphij frontfree net> http://www.delphij.net/
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