PG export import - ceph-users

18 Mar 2021

Hi,

I’ve tried to save some pg from a dead osd, I made this:

Picked on the same server an osd which is not really used and stopped that osd and import
the exported one from the dead one.

root@server:~# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-33 --no-mon-config
--pgid 44.c0s0 --op export --file ./pg44c0s0
Exporting 44.c0s0 info 44.c0s0( empty local-lis/les=0/0 n=0 ec=192123/175799
lis/c=4865474/4851556 les/c/f=4865475/4851557/0 sis=4865493)
Export successful

root@server:~# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-34 --no-mon-config
--op import --file ./pg44c0s0
get_pg_num_history pg_num_history pg_num_history(e5583546 pg_nums
{20={173213=256},21={219434=64},22={220991=64},24={219240=32},25={1446965=128},42={175793=32},43={197388=64},44={192123=512}}
deleted_pools )
Importing pgid 44.c0s0
write_pg epoch 4865498 info 44.c0s0( empty local-lis/les=0/0 n=0 ec=192123/175799
lis/c=4865474/4851556 les/c/f=4865475/4851557/0 sis=4865493)
Import successful

Started back 34 and it says the osd is running but in the cluster map it is down :/

root@server:~# systemctl status ceph-osd@34 -l
● ceph-osd@34.service<mailto:ceph-osd@34.service> - Ceph object storage daemon
osd.34
     Loaded: loaded
(/lib/systemd/system/ceph-osd@.service<mailto:/lib/systemd/system/ceph-osd@.service>;
enabled-runtime; vendor preset: enabled)
     Active: active (running) since Thu 2021-03-18 10:38:00 CET; 8min ago
    Process: 45388 ExecStartPre=/usr/lib/ceph/ceph-osd-prestart.sh --cluster ${CLUSTER}
--id 34 (code=exited, sta>
   Main PID: 45392 (ceph-osd)
      Tasks: 60
     Memory: 856.2M
     CGroup: /system.slice/system-ceph\x2dosd.slice/ceph-osd(a)34.service
             └─45392 /usr/bin/ceph-osd -f --cluster ceph --id 34 --setuser ceph --setgroup
ceph

Mar 18 10:38:00 server systemd[1]: Starting Ceph object storage daemon osd.34...
Mar 18 10:38:00 server systemd[1]: Started Ceph object storage daemon osd.34.
Mar 18 10:38:21 server ceph-osd[45392]: 2021-03-18T10:38:21.817+0100 7f41738d5dc0 -1
osd.34 5583546 log_to_mon>
Mar 18 10:38:21 server ceph-osd[45392]: 2021-03-18T10:38:21.825+0100 7f41738d5dc0 -1
osd.34 5583546 mon_cmd_ma>

Any idea?

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