30 Aug
2019
30 Aug
'19
3:22 p.m.
Hi,
did you not read my answers?
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
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.
Zitat von 74cmonty(a)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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