Hi,
1) I believe the correct way to fix this is by following the 5 step
method in the documentation; Get, Decompile, Edit, Recompile, Set.
Is that correct and is the line I should change 'choose_firstn' to
'chooseleaf_firstn'? Do I only make this change on 1 mon and it will
propagate it to all other mons and osds?
first remove the entry from ceph.conf. ;-) You can paste your current
ruleset here if you like others to take a look first, it would be
easier to confirm knowing the rest.
But those are the required steps, yes. And don't forget to test the
modified rule before setting it (change rule id and num-rep to your
needs):
crushtool -i crushmap.bin --test --rule 2 --num-rep 6 --show-mappings
crushtool -i crushmap.bin --test --rule 2 --num-rep 6 --show-bad-mappings
and modify until you get the expected distribution of PGs.
2) Does the process start immediately following the setcrushmap command?
Yes.
3) Any files to backup prior to this operation? This is production
data so we can not have any data loss.
To be able to rollback you can or should always backup the crushmap
you're about to change.
4) Any other notes/things to be aware of?
Test the new rule before applying it.
Regards,
Eugen
Zitat von Matt Dunavant <mdunavant@xxxxxxxxxxxxxxxxxx>:
Hi all,
We have a 12 OSD node cluster in which I just recently found out
that 'osd_crush_chooseleaf_type = 0' made it's way into our
ceph.conf file, probably from previous testing. I believe this is
the reason a recent maintenance on an OSD node caused data to stop
flowing. In researching how to fix this, I just wanted to confirm a
few things and see if anybody who has done this before has any
perspective or things to look out for.
1) I believe the correct way to fix this is by following the 5 step
method in the documentation; Get, Decompile, Edit, Recompile, Set.
Is that correct and is the line I should change 'choose_firstn' to
'chooseleaf_firstn'? Do I only make this change on 1 mon and it will
propagate it to all other mons and osds?
2) Does the process start immediately following the setcrushmap command?
3) Any files to backup prior to this operation? This is production
data so we can not have any data loss.
4) Any other notes/things to be aware of?
Thank you
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