Version: 2.0

Remove a failed hard disk

Story: If you have found a hard disk is failed, You need to remove it from your cluster and recover your storage pool health.#

checking storage status before start#

as shown below, We has 2 osds down due to a failed hard disk, osd no.56,58 on node hostname (s3)

s1:storage> status  cluster:    id:     c6e64c49-09cf-463b-9d1c-b6645b4b3b85    health: HEALTH_WARN            2 osds down            Degraded data redundancy: 1611/44204 objects degraded (3.644%), 106 pgs degraded
  services:    mon: 3 daemons, quorum s1,s2,s3    mgr: s1(active), standbys: s2, s3    mds: cephfs-1/1/1 up  {0=s3=up:active}, 2 up:standby    osd: 60 osds: 58 up, 60 in    rgw: 3 daemons active
  data:    pools:   22 pools, 5488 pgs    objects: 21.59k objects, 82.8GiB    usage:   232GiB used, 92.3TiB / 92.6TiB avail    pgs:     1611/44204 objects degraded (3.644%)             4873 active+clean             509  active+undersized             106  active+undersized+degraded
  io:    client:   0B/s rd, 1.88MiB/s wr, 2.74kop/s rd, 64op/s wr    recovery: 5B/s, 0objects/s    cache:    0op/s promote
+----+------+-------+-------+--------+---------+--------+---------+-----------+| id | host |  used | avail | wr ops | wr data | rd ops | rd data |   state   |+----+------+-------+-------+--------+---------+--------+---------+-----------+| 0  |  s1  | 1597M |  445G |    0   |     0   |    0   |  4096   | exists,up || 1  |  s1  | 1543M |  445G |    0   |   819   |    0   |  1638   | exists,up |~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ | 54 |  s3  | 4562M | 1858G |    2   |  64.0k  |    8   |  32.8k  | exists,up || 55 |  s2  | 3784M | 1859G |    6   |   119k  |  429   |  1717k  | exists,up || 56 |  s3  | 3552M | 1859G |    0   |     0   |    0   |     0   |   exists  || 57 |  s2  | 5285M | 1857G |    3   |  49.6k  |   12   |  76.8k  | exists,up || 58 |  s3  | 4921M | 1858G |    0   |     0   |    0   |     0   |   exists  || 59 |  s2  | 3865M | 1859G |    1   |  17.6k  |    2   |  9011   | exists,up |+----+------+-------+-------+--------+---------+--------+---------+-----------+

Remove disk#

connect to the host s3

$ ssh [email protected]Warning: Permanently added '192.168.1.x' (ECDSA) to the list of known hosts.Password:

use CLI storage> remove_disk it show /dev/sdj is associated with id 56,58 on index 10.
then we remove /dev/sdj from the ceph pool.

Remove the Hard disk from the nodes

s3> storages3:storage> remove_disk  index          name      size   storage ids--      1      /dev/sda    894.3G         21 23      2      /dev/sdb    894.3G         25 27      3      /dev/sdc      3.7T         29 31      4      /dev/sdd      3.7T         33 35      5      /dev/sde      3.7T         36 38      6      /dev/sdf      3.7T         41 42      7      /dev/sdg      3.7T         44 46      8      /dev/sdh      3.7T         48 50      9      /dev/sdi      3.7T         52 54     10      /dev/sdj      3.7T         56 58--Enter the index of disk to be removed: 10Enter 'YES' to confirm: YESRemove disk /dev/sdj successfully.

let's check the status of our storage pool, as you see, ceph is recover the data automatically

 s3:storage> status   cluster:     id:     c6e64c49-09cf-463b-9d1c-b6645b4b3b85     health: HEALTH_WARN             276/44228 objects misplaced (0.624%)             Degraded data redundancy: 908/44228 objects degraded (2.053%), 68 pgs degraded    services:     mon: 3 daemons, quorum s1,s2,s3     mgr: s1(active), standbys: s3, s2     mds: cephfs-1/1/1 up  {0=s3=up:active}, 2 up:standby     osd: 58 osds: 58 up, 58 in; 7 remapped pgs     rgw: 3 daemons active    data:     pools:   22 pools, 5488 pgs     objects: 21.60k objects, 82.9GiB     usage:   227GiB used, 88.7TiB / 88.9TiB avail     pgs:     908/44228 objects degraded (2.053%)              276/44228 objects misplaced (0.624%)              5409 active+clean              61   active+recovery_wait+degraded              7    active+recovering+degraded              4    active+recovering              4    active+remapped+backfill_wait              3    active+undersized+remapped+backfill_wait    io:     client:   273KiB/s rd, 34.7KiB/s wr, 318op/s rd, 4op/s wr     recovery: 135MiB/s, 0keys/s, 37objects/s

Results#

wait for a while and check the storage> status again
We had successfully remove the failed hard disk and the health status are OK

s1:storage> status  cluster:    id:     c6e64c49-09cf-463b-9d1c-b6645b4b3b85    health: HEALTH_OK
  services:    mon: 3 daemons, quorum s1,s2,s3    mgr: s1(active), standbys: s2, s3    mds: cephfs-1/1/1 up  {0=s3=up:active}, 2 up:standby    osd: 58 osds: 58 up, 58 in    rgw: 3 daemons active
  data:    pools:   22 pools, 5488 pgs    objects: 21.59k objects, 82.8GiB    usage:   229GiB used, 88.7TiB / 88.9TiB avail    pgs:     5488 active+clean
  io:    client:   132KiB/s rd, 5.44KiB/s wr, 159op/s rd, 0op/s wr+----+------+-------+-------+--------+---------+--------+---------+-----------+| id | host |  used | avail | wr ops | wr data | rd ops | rd data |   state   |+----+------+-------+-------+--------+---------+--------+---------+-----------+| 0  |  s1  | 1594M |  445G |    0   |     0   |    0   |     0   | exists,up || 1  |  s1  | 1536M |  445G |    0   |     0   |    0   |     0   | exists,up |~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ | 54 |  s3  | 4665M | 1858G |    3   |  29.6k  |    0   |     0   | exists,up || 55 |  s2  | 3769M | 1859G |    0   |     0   |    0   |     0   | exists,up || 57 |  s2  | 5366M | 1857G |    0   |   819   |    0   |     0   | exists,up || 59 |  s2  | 3851M | 1859G |    0   |     0   |    0   |     0   | exists,up |+----+------+-------+-------+--------+---------+--------+---------+-----------+