[Dovecot] dovecot Digest, Vol 93, Issue 41

[Alan Brown]

 > From: Stan Hoeppner <stan at hardwarefreak.com>
 > Subject: Re: [Dovecot] SSD drives are really fast running Dovecot
 >
 >
 > Yes.  Go with a cluster filesystem such as OCFS or GFS2 and an 
inexpensive SAN
 > storage unit that supports mixed SSD and spinning storage such as the 
Nexsan
 > SATABoy with 2GB cache:  http://www.nexsan.com/sataboy.php

I can't speak for OCFS2, but after several years' experience with the 
filesystem I strongly recommend NOT using GFS/GFS2. Its locking model is 
incredibly slow (500 locks/second on a filesystem mounted with quotas 
enabled and noatime) and results in dire performance - plus there's a 
known crash vulnerability if files are repeatedly renamed in large 
directories (this bites us regularly...)

GFS2 isn't an "enterprise" filesystem by any stretch of the imagination, 
despite what a number of enthusiastic salespeople might try to convince 
you of. We're lucky to keep the GFS servers up for more than a week at a 
time.