Re: Luminous BlueStore OSD - Still a way to pinpoint an object?

[Gregory Farnum <gfarnum@xxxxxxxxxx>]

The ceph-objectstore-tool also has an (experimental?) mode to mount the OSD store as a FUSE Filesystems regardless of the backend. But I have to assume what you’re really after here is repairing individual objects, and the way that works is enough different in BlueStore I really wouldn’t worry about it. The advantage of looking at the raw FileStore filesystem was you could fix issues the FS had caused, but obviously BlueStore doesn’t experience those.
-Greg

On Thu, Jun 28, 2018 at 1:54 PM Igor Fedotov <ifedotov@xxxxxxx> wrote:

You can access offline OSD using ceph-objectstore-tool which allows to enumerate and access specific objects.

Not sure this makes sense for any purposes other than low-level debugging though..

Thanks,

Igor

On 6/28/2018 5:42 AM, Yu Haiyang wrote:

Hi All,

Previously I read this article about how to locate an object on the OSD disk.

Apparently it was on a FileStore-back disk partition.

Now I have upgraded my Ceph to Luminous and hosted my OSDs on BlueStore partition, the OSD directory structure has completely changed.

The data is mapped to a block device as below and that’s as far as I can trace.

lrwxrwxrwx 1 ceph ceph   93 Jun 24 17:03 block -> /dev/ceph-0ec01ce9-d397-43e7-ad62-93cd1c62f75a/osd-block-f590b656-e40c-42f7-8cf9-ca846632d046

Hence is there still a way to pinpoint an object on a BlueStore disk partition?

Best,

Haiyang

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