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DB
Move DB to bigger storage
I.e: to move from 4GB partition to 30GB partition in case of BlueFS spillover detected
lvdisplay --- Logical volume --- LV Path /dev/ceph-66ad9fa6-0f65-4fc0-baeb-41089a509347/osd-block-4a9e142e-ed4d-4890-a018-5651c36071a5 LV Name osd-block-4a9e142e-ed4d-4890-a018-5651c36071a5 --- Logical volume --- LV Path /dev/ceph-ffd9911c-2d6c-43aa-b637-bec8a2092a30/osd-db-ad0a2108-bcca-4f15-9747-29d86624b911 LV Name osd-db-ad0a2108-bcca-4f15-9747-29d86624b911 VG Name ceph-ffd9911c-2d6c-43aa-b637-bec8a2092a30 LV Size 4,00 GiB Current LE 1024 vgdisplay --- Volume group --- VG Name ceph-ffd9911c-2d6c-43aa-b637-bec8a2092a30 VG Size 4,00 GiB PE Size 4,00 MiB Total PE 1025 Alloc PE / Size 1024 / 4,00 GiB Free PE / Size 1 / 4,00 MiB pvdisplay --- Physical volume --- PV Name /dev/nvme0n1p5 VG Name ceph-ffd9911c-2d6c-43aa-b637-bec8a2092a30 PV Size <4,01 GiB / not usable 2,00 MiB Allocatable yes PE Size 4,00 MiB Total PE 1025 Free PE 1 Allocated PE 1024 PV UUID pjYGgY-SS26-m8Sc-aWyQ-3zzY-f7Iz-XGoI90
Create new 41GB partition (/dev/nvme0n1p6)
pvcreate /dev/nvme0n1p6 vgcreate ceph-db-40gb /dev/nvme0n1p6 lvcreate -n db-40db -l 100%FREE ceph-db-40gb
ceph osd set noout systemctl stop ceph-osd@3.service cat /var/lib/ceph/osd/ceph-3/fsid ceph-volume lvm migrate --osd-id 3 --osd-fsid 4a9e142e-ed4d-4890-a018-5651c36071a5 --from db --target ceph-db-40gb/db-40gb systemctl start ceph-osd@3.service ceph osd unset noout
Move DB disks
In case of replace (full copy by dd
) NVM drive where partition for OSD's DB is located, OSD service cannot start.
Reason is that CEPH doesn't have permission to access device owned by root
. To repair everything with one command:
ceph-volume lvm activate --all
draft
$ systemctl stop ceph-osd@68 $ ceph-bluestore-tool --path /var/lib/ceph/osd/ceph-68 --devs-source /var/lib/ceph/osd/ceph-68/block --dev-target /var/lib/ceph/osd/ceph-68/block.db bluefs-bdev-migrate $ systemctl start ceph-osd@68