Looking for advice on migration to new Cyrus-IMAPd server

[Simon Matter]

> I've built a new Cyrus-IMAPd server (hardware).   It has two sets
> of mirrored disks.  The OS is on WD VelociRaptor 450GB drives.  The
> bulk IMAP data will be on WD Black RE-4 2TB drives.  So far, I think
> I want to use ZFS for both mirrors.
>
> I wanted to see what the list recommends for the migration.
>
> The current server is running FreeBSD 8.2, with cyrus-imapd-2.3.16
> on a RAID-5 setup on SCSI-UW with 15000RPM drives.  We get about
> 1.5 - 9MB/s at 80 - 100% busy according to "systat -vm 1" for most
> of the day.
>
> The existing server has no metadata partition.  On the new server,
> I believe that I want to put the config directory and metadata
> partition on the 46050GB drives and the message files on the 2TB drives.
>
> Can I configure the new server's imapd.conf to put data where I
> want it, and simply use the cyrus replication to put the data in
> the right place on the new server?  In other words can the migration
> split my data partition into data and metadata partitions without
> my having to script up shuffling files around then reconfiguring
> and restarting cyrus?

I can't comment on this one. I've tried metadata partitions but never
tried doing it online.

>
> Also, should I install Cyrus-IMAPd 2.3 or 2.4 on the new server?
> I tend to be a late adopter.  I'm wondering if 2.4 is generally
> considered ready for a single server install in a multi-domain ISP
> type environment.

Personally I consider 2.4 as stable as 2.3. It has worked very well for us.

Simon