Hi,
don´t be afraid! ;)
It´s straight forward, important is only not to use the same ip and name
on the host, then there will be no problems. No need to keep any config
- setup the osds again, moving them is a thing I did not try and seems
to be to much of an effort, easier to reinstall.
best regards
Ralf
Am 12/07/2021 um 09:01 schrieb Christoph Weber:
Thanks for your advice, Ralf and Eneko ,
@Ralph
please read the documentation about removing/replacing a Node carefully
- you may not reinstall it with the same IP and/or Name as this will crash your
whole cluster!
This is my bigges fear ...
Thanks for pointing me to the manual - there is in fact an detailed explanation which
files to keep before reinstalling the node under "Re-installing a cluster node".
This is excactly what I was looking for, with detailed step-by-step walktrough.
Though I'm not sure if I will give it a try - looks a bit risky to mess things
up in one of the many manual steps.
For the boot disks we use 2 or 3 mirrored zfs disks to be sure...
Sounds like a good idea in retrospect ;-)
Until now I just was under the impression that the system disk does not contain
very important data and can easily be replaced ...
@Eneko Lacunza
Do you have Ceph OSD journal/DB/WALs on system disk?
No, we have everything belonging to one OSDs on the corresponding SSD drive.
Moving OSDs from node3 to node6 would trigger data movement, but I'd go
Will it? I thought it might just relocate the ODSs location in the crush map
from node3 to node6 when I shut down the prodve3, remove the disks and reinsert
them in node 6? At least that was my impression in a thread here on the
mailinglist a few weeks ago.
node3, "pvecm delnode" it, reinstall with new system disk and rejoin cluster.
This seems to be the best solution.
Maybe we will just discontinue the node, as it is getting near its planned
lifetime ...
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