Hello,
On Fri, 22 Apr 2016 06:20:17 +0200 Martin Wilderoth wrote:
> I have a ceph cluster and I will change my journal devices to new SSD's.
>
> In some instructions of doing this they refer to a journal file (link to
> UUID of journal )
>
> In my OSD folder this journal don’t exist.
>
If your cluster is "years old" and not created with ceph-disk, then yes,
that's not surprising.
Mind, I created a recent one of mine manually and still used that scheme:
--- ls -la /var/lib/ceph/osd/ceph-12/
total 80
drwxr-xr-x 4 root root 4096 Mar 1 14:44 .
drwxr-xr-x 8 root root 4096 Sep 10 2015 ..
-rw-r--r-- 1 root root 37 Sep 10 2015 ceph_fsid
drwxr-xr-x 320 root root 24576 Mar 2 20:24 current
-rw-r--r-- 1 root root 37 Sep 10 2015 fsid
lrwxrwxrwx 1 root root 44 Sep 10 2015 journal -> /dev/disk/by-id/wwn-0x55cd2e404b77573c-part5
-rw------- 1 root root 57 Sep 10 2015 keyring
---
Ceph isn't magical, so if that link isn't there, you probably have
something like this in your ceph.conf, preferably with UUID instead of thet
possibly changing device name:
---
[osd.0]
host = ceph-01
osd journal = /dev/sdc3
---
Yes that is my setup, Would that mean i could either create symlink journal -> /dev/disk/......
remove the osd journal in ceph.conf.
or change my ceph.conf with osd journal = /dev/....
And the recommended way is actually to use journal symlink ?
> This instructions is renaming the UUID of new device to the old UUID not
> to break anything.
>
> i was planning to use the command ceph-osd --mkjournal and update the
> ceph. conf accordingly.
>
> Do I need to take care of my missing journal symlink, i think it is a
> symlink ?
> Why is it there, and how is it used ?.
>
> I actually don’t remember the command i used to create the disk but it's
> some years ago and i doubt i used ceph-disk.
>
> I found the following process in this list, that seemed good. But its
> still not clear to me if i can skip this journal link ?
>
> *set noout*
> *stop the osds*
> *flush the journal*
> *replace journal SSDs*
> recreate journal partitions
> update ceph.conf to reflect new journal device names
Either that or remove the location and create the symlink.
In both cases UUID is the fail-safe way to go.
> *recreate the journal (for the existing osds)*
> *start the osds*
> *unset noout*
I dont really need to keep the old uuid as long as im using the correct uuid in my config (symlink) ?
To check what journal an osd is using what is the command ?
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