Mike Denka <[EMAIL PROTECTED]> wrote:
> Could you, or anyone else who would care to join this discussion, please be
> more specific re: "Suns filesystems and qmails file operations"?
I've done a lot tweaking squid proxies (Sun U2) and
therefore had a lot to do with filesystems. You can see
the difference, when you let squid create it's cache-dirs
on a Sun and on e. g. a Linux box.
There are several possibilities to increase the
performance of Suns ufs.
1. use more spindles (that's why I asked for the number of
disks in the A1000) - we used multipacks with 2 GB
disks.
2. mount the filesystems with options ufs-logging and
no-atime (if you're lucky and run Solaris 7).
3. try fastfs (not really recommended for mail servers)
4. read the tuning books (Porsche and others)
> We are load balancing a pair of Sun E250's sharing one
> disk array via NFS. All Maildirs are on the NFS share.
> So far (roughly 10,000 mailboxes) I don't notice any
> real problems. But I would be very interested in more
> detail regarding these two issues (Sun filesystems and qmail file operations)
> in case I do begin to notice I/O issues on the NFS server.
Sorry, I've no experience with shared-storage on NFS.
Maybe there are other issues with this ...
> Can you give a detailed explanation or perhaps point me
> to some appropriate docs for more detail?
It's always the (a)synchronous update of metadata on the
disk, buffering, etc.
There's a nice paper about the soft-updates, which are
used with FreeBSD ...
By
Töns
--
Linux. The dot in /.
