Hi,
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
I think you're trying the wrong option. 'man bluefs-bdev-new-db' says:
bluefs-bdev-new-db --path osd path --dev-target new-device
Adds DB device to BlueFS, fails if DB device already exists.
If you want to move an existing DB you should use bluefs-bdev-migrate
instead. I haven't tried it yet, though.
How can I increase the DB size later in case it's insufficient?
There's also a bluefs-bdev-expand command to resize the db if the
underlying device has more space available. It depends on your ceph
version, of course. This was not possible in Luminous, I'm not sure
about Mimic but it works in Nautilus.
Regards,
Eugen
Zitat von 74cmonty@xxxxxxxxx:
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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