Re: Ceph object recovery

[Daniel K <sathackr@xxxxxxxxx>]

So I'm not sure if this was the best or right way to do this but --

using rados I confirmed the unfound object was in the cephfs_data pool

# rados -p cephfs_data ls|grep 001c0ed4

using the osdmap tool I found the pg/osd the unfound object was in -- 

# osdmaptool --test-map-object 10000000062.001c0ed4 osdmap

(previously exported osdmap to file "osdmap")

>  object '10000000062.001c0ed4' -> 1.21 -> [4]

then told ceph to just delete the unfound object

ceph pg 1.21 mark_unfound_lost delete

and then used rados to put the object back (from the file I had extracted previously)

# rados -p cephfs_data put 10000000062.001c0ed4 10000000062.001c0ed4.obj

Still have more recovery to do but this seems to have fixed my unfound object problem.

On Tue, Jul 25, 2017 at 12:54 PM, Daniel K <sathackr@xxxxxxxxx> wrote:

I did some bad things to my cluster, broke 5 OSDs and wound up with 1 unfound object.

I mounted one of the OSD drives, used ceph-objectstore-tool to find and exported the object:

ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-10 10000000062.001c0ed4 get-bytes filename.obj

What's the best way to bring this object back into the active cluster?

Do I need to bring an OSD offline, mount it and do the reverse of the above command?

Something like: 

ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-22 10000000062.001c0ed4 set-bytes filename.obj

Is there some way to do this without bringing down an osd?

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