Your reply seems to contradict the reply from Sage:
> Sage -
> The journal device needs a file system created does that device need to
be mounted?
Yes.. the mkjournal step needs to writes to the journal (wehther it's a
file or block device).
Tim
From: Kurt Bauer [mailto:kurt.ba...@univie.ac.at]
Sent: Monday, October 21, 2013 10:16 AM
To: Snider, Tim
Cc: ceph-users@lists.ceph.com
Subject: Re: [ceph-users] changing from default journals to external journals
Hi,
neither do you need a filesystem on the partition, nor does it have to be
mounted. You can link the journal against the raw partition.
Best regards,
Kurt
Snider, Tim schrieb:
Sage -
The journal device needs a file system created does that device need to be
mounted?
Tim
-----Original Message-----
From: Sage Weil [mailto:s...@inktank.com]
Sent: Thursday, October 17, 2013 11:02 AM
To: Snider, Tim
Cc: ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com>
Subject: RE: [ceph-users] changing from default journals to external journals
On Thu, 17 Oct 2013, Snider, Tim wrote:
/var/lib/ceph/osd/ceph-NNN/journal is a "real" file on my system:
ls -l /var/lib/ceph/osd/ceph-0/journal
-rw-r--r-- 1 root root 1073741824 Oct 17 06:47
/var/lib/ceph/osd/ceph-0/journal
Any problems with my proposed added steps (3 - 5)?
1. stop a ceph-osd daemon
2. ceph-osd --flush-journal -i NNN
3. (+) cp /var/lib/ceph/osd/ceph-NNN/journal
/var/lib/ceph/osd/ceph-NNN/journal.saved
4. (+) create a new empty journal file:
touch /mount/sdzNNN/journal
5. (+) Create the symbolic link for Ceph:
ln -s /mount/sdzNNN/journal var/lib/ceph/osd/ceph-NNN/journal
3. mv journal journal.old
4. ln -s /dev/whatever journal
(you're better off using a raw partition or other block device than a
file.) or,
4. touch /new/path
5. ln -s /other/path journal
6. ceph-osd --mkjournal -i NNN
7. start ceph-osd
Tim
-----Original Message-----
From: Sage Weil [mailto:s...@inktank.com]
Sent: Wednesday, October 16, 2013 5:02 PM
To: Snider, Tim
Cc: ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com>
Subject: Re: [ceph-users] changing from default journals to external
journals
On Wed, 16 Oct 2013, Snider, Tim wrote:
I configured my cluster using the default journal location for my
osds. Can I migrate the default journals to explicit separate
devices without a complete cluster teardown and reinstallation? How?
- stop a ceph-osd daemon, then
- ceph-osd --flush-journal -i NNN
- set/adjust the journal symlink at /var/lib/ceph/osd/ceph-NNN/journal to
point wherever you want
- ceph-osd --mkjournal -i NNN
- start ceph-osd
This won't set up the udev magic on the journal device, but that doesn't really
matter if you're not hotplugging devices.
sage
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