I created a ceph cluster for test, here's mistake I made:
Add a second mds: mds.ab, executed 'ceph mds set_max_mds 2', then
removed the mds just added;
Then 'ceph mds set_max_mds 1', the first mds.aa crashed, and became laggy.
As I can't repair mds.aa, so did 'ceph mds newfs metadata data
--yes-i-really-mean-it';
mds.aa was back, but 1TB data was in cluster lost, but disk space
still used, by 'ceps -s'.
Is there any chance I can get my data back? If can't, how can I
retrieve back the disk space.
Now it looks like:
log3 ~ # ceph -s
health HEALTH_OK
monmap e1: 1 mons at {log3=10.205.119.2:6789/0}, election epoch 0,
quorum 0 log3
osdmap e1555: 28 osds: 20 up, 20 in
pgmap v56518: 960 pgs: 960 active+clean; 1134 GB data, 2306 GB
used, 51353 GB / 55890 GB avail
mdsmap e703: 1/1/1 up {0=aa=up:active}, 1 up:standby
log3 ~ # df | grep osd |sort
/dev/sdb1 2.8T 124G 2.5T 5% /ceph/osd.0
/dev/sdc1 2.8T 104G 2.6T 4% /ceph/osd.1
/dev/sdd1 2.8T 84G 2.6T 4% /ceph/osd.2
/dev/sde1 2.8T 117G 2.6T 5% /ceph/osd.3
/dev/sdf1 2.8T 105G 2.6T 4% /ceph/osd.4
/dev/sdg1 2.8T 84G 2.6T 4% /ceph/osd.5
/dev/sdh1 2.8T 140G 2.5T 6% /ceph/osd.6
/dev/sdi1 2.8T 134G 2.5T 5% /ceph/osd.8
/dev/sdj1 2.8T 112G 2.6T 5% /ceph/osd.7
/dev/sdk1 2.8T 159G 2.5T 6% /ceph/osd.9
/dev/sdl1 2.8T 126G 2.5T 5% /ceph/osd.10
osd on another host didn't show.
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