Re: changing from default journals to external journals

["Snider, Tim" <Tim.Snider@xxxxxxxxxx>]

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.bauer@xxxxxxxxxxxx]
Sent: Monday, October 21, 2013 10:16 AM
To: Snider, Tim
Cc: ceph-users@xxxxxxxxxxxxxx
Subject: Re: 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:sage@xxxxxxxxxxx] 

Sent: Thursday, October 17, 2013 11:02 AM

To: Snider, Tim

Cc: ceph-users@xxxxxxxxxxxxxx

Subject: RE:  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:sage@xxxxxxxxxxx]

Sent: Wednesday, October 16, 2013 5:02 PM

To: Snider, Tim

Cc: ceph-users@xxxxxxxxxxxxxx

Subject: Re:  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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