Re: Using device mapper with journal on separate partition

Adrien Gillard <gillard.adrien@xxxxxxxxx> · Sun, 3 Apr 2016 17:30:57 +0200

Hi, 

As you create your journal partition manually, you need to set a proper ceph partition GUID for the partition to be configured with correct ownership (ie ceph).

The issue has been faced by others before (including me), please refer to previous threads on the mailing list [0] [1] and you should be fine.

[0] http://thread.gmane.org/gmane.comp.file-systems.ceph.user/27856
[1] http://thread.gmane.org/gmane.comp.file-systems.ceph.user/25734

On Fri, Apr 1, 2016 at 10:22 PM, Andrus, Brian Contractor <bdandrus@xxxxxxx> wrote:

All,

I am trying to use ceph-deploy to create an OSD on a multipath device but put the journal partition on the SSD the system boots from.
I have created a partition on the SSD (/dev/sda5) but ceph-deploy does not seem to like it.

I am trying:
ceph-deploy osd create ceph01:/dev/mapper/mpathb:/dev/sda5

It runs through and ends with:
[INFO  ] Running command: ceph --cluster=ceph osd stat --format=json
[WARNIN] there is 1 OSD down
[WARNIN] there is 1 OSD out

So I try to activate it:
                ceph-deploy disk activate ceph-1-35a:/dev/mapper/mpathb1:/dev/sda5

But that gives me an error:
[WARNIN] 2016-04-01 13:07:55.519488 7fecdd044800 -1  ** ERROR: error creating empty object store in /var/lib/ceph/tmp/mnt.VTxcYn: (13) Permission denied

It works fine if I only specify the single multipath device.
It works fine if I point to a disk for the journal, but not a partition.
It seems ceph-deploy is not set up to use an existing partition on a separate disk for a journal?

Is there a way to get ceph-deploy to use an existing partition for a journal?

Brian Andrus
ITACS/Research Computing
Naval Postgraduate School
Monterey, California
voice: 831-656-6238

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