Date: Wed, 24 Sep 2008 00:04:25 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Laszlo Nagy <gandalf@shopzeus.com> Cc: freebsd-questions@freebsd.org, Tony Nagy - SHOPZEUS <tony@shopzeus.com> Subject: Re: dovecot, maildir, UFS 2 performance Message-ID: <20080923235932.U55719@wojtek.tensor.gdynia.pl> In-Reply-To: <48D95A19.8030700@shopzeus.com> References: <48D95A19.8030700@shopzeus.com>
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> dir goes to SATA. > > The secondary task for this server is to be an IMAP and mail server. We will > be using dovecot, and shared maildir folders with ten thousands of messages. > I'm not sure where to put the maildir folders, and what options to use for unless you have tens of thousands of mail users, put it anywhere ;) it will work fine. > #1 maildir stores each message in a separate file. I think I need to dedicate > a separate disk slice for maildirs and decrease block size on it. How big > should the blocksize be? i have everything (/) on single partition on most of my servers, including those having lots of mail. i too use dovecot and maildirs. default fragment size of 2K is fine, average mailfile size is not that small to bother making smaller fragments. > #2 searching in messages is a common operation. Possibly read speed is very > most important. But since there will be thousands of files to open, seek > operation is also important. On which RAID array should I put mail dirs? dovecot do make indexes and scans all files only when rebuilding them. > Small SAS or bigger SATA array? assuming you configured your RAID1+0 properly it will give you MUCH more performance from 10 disks, than RAID1 on 2 - a bit faster - drives. IMHO you wasted money for SAS drives, simply having SATA only system could be enough. just keep your SAS drives for OS, ports, sources, logs, whatever, while /home on your big RAID1+0 volume.
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