Move data to new harddisk (fs-type and options, config)

[Thomas Schlosser]

Thanks Simon,
this helped me a lot.
I will now create 2 disk partitions (in an extended part I think) one for
configdirectory and one for partition-default and mount them to their old
loacions.
I will use rsync -aH instead of cp

btw I forgot to mention that this is a SUSE box (9.2, 2.6 kernel) where
Reiser is the default FS.

Cheers
Thomas

2006/6/18, Simon Matter <simon.matter at ch.sauter-bc.com>:
>
> > Hi,
> > I am about to move my IMAP storage to a new harddisk (old HD gets too
> > small
> > and may fail in the near future).
> > Cyrus  serves a small group of people (about 5), running on old hardware
> > (PII,300) with a new 80GB IDE HD. No performance issues.
> > I have several questions about details of the migration:
> >
> > 1. a) FS-type: any recommendations (I would have used reiserfs, but ext3
> > or
> > ext2 could be options as well)?
>
> Okay, this lets us know that you are running Linux. I'm using XFS and ext3
> and it seems that reiserfs also performs well with cyrus. I think you can
> choose any of them, however not every FS is well integrated in any distro.
>
> > b) FS options: should I use specials options when generating the FS
> (there
> > may be a lot of files in folders as we all know), eg inodes,...
>
> I don't think you have to care about that for a small 80G cyrus message
> store. Of course that's something else in the multi Terabyte range...
>
> > c) any mount-options I should use?
> > FYI: the new harddisk will be mounted to /data and will have directories
> > imap/part and imap/conf directories for the partition and configdir)
>
> I'm usually using noatime for /var/spool/imap with ext3.
>
> >
> > 2. Which parts should I move:
> > a) Of course I want to move the partition (partition-default, which ist
> > /var/spool/imap currently)
> > b) I would like to move configdirectory (/var/lib/imap) as well - is the
> > recommendable?
> >
> > 3. How to do the migration
> > I intended to
> > - stop postfix and imapd
> > - copy all files with "cp --preserve --recursive" to the new location
> (are
> > there links to be taken care of)?
>
> Yes, there may be hardlinks when using single instance store, "rsync -aH"
> is better anyway.
>
> > - change /etc/imapd.conf regarding the two settings (partition-default
> and
> > configdirectory)
>
> I don't suggest putting configdirectory and partition-default on the same
> filesystem if you want to use noatime option.
>
> > - start imapd and postfix again
> > Will this work or is this not the preferred way to to it
>
> This will work but why not simply move the data to filesystems on the new
> disk and then mount them to the old locations?
>
> Simon
>
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