Well, I'm not paying for it. And I've managed to fix the comedy
stability I've come across so far, but you're right- I haven't really
loaded the system up yet.
My rationale is that I want a filesystem I can share between several
servers, reducing the points of failure as far as I can down. We've got
a large iSCSI SAN we've already bought for other projects, and I'd like
to use that for our storage. So using NFS, I'd have to have another
server in front of my SAN that act as an NFS server (presuambly as a
single point of failuire), and the mail servers as NFS clients. I'd
rather have the servers talk to the SAN directly. Besides, NFS never
really works for me, but I'm sure I could overcome that.
Anyway, I don't think it's a GFS problem so far.
-----Original Message-----
From: dovecot-bounces@dovecot.org
[mailto:dovecot-bounces@dovecot.org] On Behalf Of Justin McAleer
Sent: 05 April 2007 13:37
To: dovecot@dovecot.org
Subject: Re: [Dovecot] Problems using GFS2 and clustered dovecot
David Craigon wrote:
I am trying to use dovecot. I've got a GFS2 shared volume on two
servers with dovecot running on both. On one server at a
time, it works.
Sorry to not answer your question directly, but do you have a
good reason to be using GFS instead of NFS? We experimented
with GFS last year (granted, not GFS2), and found its
performance pretty horrible and its stability comically
bad... had we been paying for it, however, it wouldn't have
been funny. OCFS2 was better, but still unreliable. Lustre
was the best we found (it worked, at least), but it required
a lot of hardware/admin overhead. We tried other clustering
filesystems as well, and none of them was worth the trouble.
The test I am trying is to attach two mail programs (MUA) via IMAPS
(Thunderbird and Evolution as it happens). I've attached one mail
program to each IMAPS server. I am trying to move emails
around in one
program (from folder to folder), and then checking it on the other
program. I'm testing in effect how it would work if my users log on
twice and end up on different servers.
I seem to suffer from never ending index file corruption:
Apr 4 16:55:49 mailstore-b dovecot:
IMAP(david@everybody-loves.craigon.co.uk): Corrupted
transaction log
file
/mnt/mailstore/e/everybody-loves.craigon.co.uk/d/david/.fish/dovecot.i
nd
ex.log:
end_offset (284) > current sync_offset (104) Apr 4 16:55:49
mailstore-b
dovecot:
IMAP(david@everybody-loves.craigon.co.uk): broken sync positions in
index file
/mnt/mailstore/e/everybody-loves.craigon.co.uk/d/david/.fish/dovecot.i
nd
ex
Apr 4 16:55:49 mailstore-b dovecot:
IMAP(david@everybody-loves.craigon.co.uk): fscking index file
/mnt/mailstore/e/everybody-loves.craigon.co.uk/d/david/.fish/dovecot.i
nd
ex
Apr 4 16:55:49 mailstore-b dovecot:
IMAP(david@everybody-loves.craigon.co.uk): Fixed index file
/mnt/mailstore/e/everybody-loves.craigon.co.uk/d/david/.fish/dovecot.i
nd
ex:
log file sync pos 1,284 -> 1, 104
Apr 4 16:55:50 mailstore-b dovecot:
IMAP(david@everybody-loves.craigon.co.uk): Unexpected
transaction log
desync with index
/mnt/mailstore/e/everybody-loves.craigon.co.uk/d/david/.fish/dovecot.i
nd
ex
Apr 4 16:56:18 mailstore-b dovecot:
IMAP(david@everybody-loves.craigon.co.uk): Transaction log file
/mnt/mailstore/e/everybody-loves.craigon.co.uk/d/david/.fish/dovecot.i
nd
ex.log:
marked corrupted
This happens pretty quickly. I can also get message
duplication- if I
move a message from one server to another, I can get a
message in the
original folder and the destination folder.
I am using RC28. I have tried using fcntl locking and
dotlocking with
equal lack of success.
Can anyone offer any advice?
David
Griffin Information Systems Ltd
20 St Christopher's Way,
Pride Park,
Derby
DE24 8JY
www.griffin.com <http://www.griffin.com/>
Registered in England and Wales. Company Registration
Number: 3676297.
VAT Number: 716604053