Sorry, I misread, your option is correct, of course since there was no
external db device.
This worked for me:
ceph-2:~ # CEPH_ARGS="--bluestore-block-db-size 1048576"
ceph-bluestore-tool --path /var/lib/ceph/osd/ceph-1 bluefs-bdev-new-db
--dev-target /dev/sdb
inferring bluefs devices from bluestore path
DB device added /dev/sdb
ceph-2:~ # ll /var/lib/ceph/osd/ceph-1/block*
lrwxrwxrwx 1 ceph ceph 93 31. Jul 15:04 /var/lib/ceph/osd/ceph-1/block
->
/dev/ceph-d1f349d6-70ba-40d3-a510-3e5afb585782/osd-block-7523a676-a9de-4ed9-890c-197c6cd2d6d1
lrwxrwxrwx 1 root root 8 29. Aug 12:14
/var/lib/ceph/osd/ceph-1/block.db -> /dev/sdb
Regards,
Eugen
Zitat von 74cmo...@gmail.com:
Hi,
I have created OSD on HDD w/o putting DB on faster drive.
In order to improve performance I have now a single SSD drive with 3.8TB.
I modified /etc/ceph/ceph.conf by adding this in [global]:
bluestore_block_db_size = 53687091200
This should create RockDB with size 50GB.
Then I tried to move DB to a new device (SSD) that is not formatted:
root@ld5505:~# ceph-bluestore-tool bluefs-bdev-new-db –-path
/var/lib/ceph/osd/ceph-76 --dev-target /dev/sdbk
too many positional options have been specified on the command line
Checking the content of /var/lib/ceph/osd/ceph-76 it appears that
there's no link to block.db:
root@ld5505:~# ls -l /var/lib/ceph/osd/ceph-76/
insgesamt 52
-rw-r--r-- 1 ceph ceph 418 Aug 27 11:08 activate.monmap
lrwxrwxrwx 1 ceph ceph 93 Aug 27 11:08 block ->
/dev/ceph-8cd045dc-9eb2-47ad-9668-116cf425a66a/osd-block-9c51bde1-3c75-4767-8808-f7e7b58b8f97
-rw-r--r-- 1 ceph ceph 2 Aug 27 11:08 bluefs
-rw-r--r-- 1 ceph ceph 37 Aug 27 11:08 ceph_fsid
-rw-r--r-- 1 ceph ceph 37 Aug 27 11:08 fsid
-rw------- 1 ceph ceph 56 Aug 27 11:08 keyring
-rw-r--r-- 1 ceph ceph 8 Aug 27 11:08 kv_backend
-rw-r--r-- 1 ceph ceph 21 Aug 27 11:08 magic
-rw-r--r-- 1 ceph ceph 4 Aug 27 11:08 mkfs_done
-rw-r--r-- 1 ceph ceph 41 Aug 27 11:08 osd_key
-rw-r--r-- 1 ceph ceph 6 Aug 27 11:08 ready
-rw-r--r-- 1 ceph ceph 3 Aug 27 11:08 require_osd_release
-rw-r--r-- 1 ceph ceph 10 Aug 27 11:08 type
-rw-r--r-- 1 ceph ceph 3 Aug 27 11:08 whoami
root@ld5505:~# more /var/lib/ceph/osd/ceph-76/bluefs
1
Questions:
How can I add DB device for every single existing OSD to this new SSD drive?
How can I increase the DB size later in case it's insufficient?
THX
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