Looking for advice on migration to new Cyrus-IMAPd server

Bron Gondwana brong at fastmail.fm
Sat Mar 12 08:35:05 EST 2011

On Sat, Mar 12, 2011 at 02:20:04PM +0100, Simon Matter wrote:
> > 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.

Cyrus won't move them for you, and I don't think there is even a tool
to do it.  Sorry.
> > 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.

I am biased here ;)  I think 2.4 is a lot better, but not as
"battle tested".  There are some known bugs I'm hoping to fix
with another 2.4 release very soon.


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