Describe when someone would need this information. For example "when connecting to wi-fi for the first time".
Let's suppose that osd.14 (/dev/vdd) is broken.
Let's verify that this is a Bluestore OSD:
# ceph osd metadata 14 | grep osd_ob
"osd_objectstore": "bluestore",
Let's find the relevant devices:
[root@c-osd-5 /]# ceph-bluestore-tool show-label --path /var/lib/ceph/osd/ceph-14/
infering bluefs devices from bluestore path
{
"/var/lib/ceph/osd/ceph-14//block": {
"osd_uuid": "d14443ed-2f7d-4bbc-8cdf-f55c7e00a9b5",
"size": 107369988096,
"btime": "2019-01-30 16:33:54.429292",
"description": "main",
"bluefs": "1",
"ceph_fsid": "7a8cb8ff-562b-47da-a6aa-507136587dcf",
"kv_backend": "rocksdb",
"magic": "ceph osd volume v026",
"mkfs_done": "yes",
"osd_key": "AQDWw1Fc6g0zARAAy97VirlJ+wC7FmjlM0w3aQ==",
"ready": "ready",
"whoami": "14"
},
"/var/lib/ceph/osd/ceph-14//block.db": {
"osd_uuid": "d14443ed-2f7d-4bbc-8cdf-f55c7e00a9b5",
"size": 53687091200,
"btime": "2019-01-30 16:33:54.432415",
"description": "bluefs db"
}
}
Let's find the volume groups used for the block and block.db:
[root@c-osd-5 /]# ls -l /var/lib/ceph/osd/ceph-14//block
lrwxrwxrwx 1 ceph ceph 27 May 13 15:34 /var/lib/ceph/osd/ceph-14//block -> /dev/ceph-block-14/block-14
[root@c-osd-5 /]# ls -l /var/lib/ceph/osd/ceph-14//block.db
lrwxrwxrwx 1 ceph ceph 24 May 13 15:34 /var/lib/ceph/osd/ceph-14//block.db -> /dev/ceph-db-12-15/db-14
[root@c-osd-5 /]#
Let's verify that vdd is indeed the physical volume used for this OSD:
[root@c-osd-5 /]# vgdisplay -v ceph-block-14
--- Volume group ---
VG Name ceph-block-14
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 15
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size <100.00 GiB
PE Size 4.00 MiB
Total PE 25599
Alloc PE / Size 25599 / <100.00 GiB
Free PE / Size 0 / 0
VG UUID lcEfNK-P7gw-ddeH-ijGC-2d6z-WuUo-hqI1H2
--- Logical volume ---
LV Path /dev/ceph-block-14/block-14
LV Name block-14
VG Name ceph-block-14
LV UUID hu4Xop-481K-BJyP-b473-PjEW-OQFT-oziYnc
LV Write Access read/write
LV Creation host, time c-osd-5.novalocal, 2019-01-30 11:22:24 +0100
LV Status available
# open 4
LV Size <100.00 GiB
Current LE 25599
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 252:14
--- Physical volumes ---
PV Name /dev/vdd
PV UUID 2ab6Mn-8c5b-rN1H-zclU-uhnF-YJmF-e0ITMt
PV Status allocatable
Total PE / Free PE 25599 / 0
[root@c-osd-5 /]#
The following operations should be done to remove it from ceph:
ceph osd crush reweight osd.14 0
This will trigger a data movement from that OSD (ceph status will report many objects misplaced)
Wait until there are no more objects misplaced
Then:
ceph osd out osd.14
Verifichiamo che si possa "rimuovere" l'OSD
[root@ceph-mon-01 ~]# ceph osd safe-to-destroy 14
OSD(s) 14 are safe to destroy without reducing data durability.
[root@ceph-osd-02 ~]# systemctl kill ceph-osd@14
[root@ceph-osd-02 ~]# ceph osd destroy 14 --yes-i-really-mean-it
[root@ceph-osd-02 ~]# umount /var/lib/ceph/osd/ceph-14
Cancelliamo il volume group:
[root@c-osd-5 /]# vgremove ceph-block-14
Do you really want to remove volume group "ceph-block-14" containing 1 logical volumes? [y/n]: y
Do you really want to remove active logical volume ceph-block-14/block-14? [y/n]: y
Logical volume "block-14" successfully removed
Volume group "ceph-block-14" successfully removed
[root@c-osd-5 /]#
Sostituiamo il disco. Supponiamo che quello nuovo si chiami sempre vdd.
Ricreo volume group e logical volume:
[root@c-osd-5 /]# vgcreate ceph-block-14 /dev/vdd
Physical volume "/dev/vdd" successfully created.
Volume group "ceph-block-14" successfully created
[root@c-osd-5 /]# lvcreate -l 100%FREE -n block-14 ceph-block-14
Logical volume "block-14" created.
[root@c-osd-5 /]#
Alla fine ricreiamo l'OSD:
ceph osd set norebalance
ceph osd set nobackfill
[root@c-osd-5 /]# ceph-volume lvm create --bluestore --data ceph-block-14/block-14 --block.db ceph-db-12-15/db-14 --osd-id 14
Dopo un po`, quando non ci sono piu` pg in peering:
ceph osd crush reweight osd.14 5.45609
ceph osd unset nobackfill
ceph osd unset norebalance
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