You can certainly use a similarly named device to back an OSD journal if the OSDs are on separate hosts. If you want to take a single SSD device and utilize it as a journal for many OSDs on the same machine then you would want to partition the SSD device and use a different partition for each OSD journal. You might consider using /dev/disk/by-id/foo instead of /dev/fioa1 to avoid potential device reordering issues after a reboot. Hope that helps, sorry if I misunderstood.
On Wed, Oct 9, 2013 at 7:03 AM, Andreas Bluemle <andreas.bluemle@xxxxxxxxxxx> wrote:
Hi,
to avoid confusion: the configuration did *not* contain
multiple osds referring to the same journal device (or file).
The snippet from ceph.conf suggests osd.214 and osd.314
both use the same journal -
but it doesn't show that these osds run on different hosts.
Regards
Andreas Bluemle
--
On Wed, 9 Oct 2013 11:23:18 +0200
Andreas Friedrich <andreas.friedrich@xxxxxxxxxxxxxx> wrote:
> Hello,
>
> I have a Ceph test cluster with 88 OSDs running well.
>
> In ceph.conf I found multiple OSDs that are using the same SSD block
> device (without a file system) for their journal:
>
> [osd.214]
> osd journal = /dev/fioa1
> ...
> [osd.314]
> osd journal = /dev/fioa1
> ...
>
> Is this a allowed configuration?
>
> Regards
> Andreas Friedrich
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>
Andreas Bluemle mailto:Andreas.Bluemle@xxxxxxxxxxx
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