I don't think that there's a feasible way to do this in a controlled manner. I would just change it and trust Ceph's remapping mechanism to work properly.
You could use crushtool to calculate what the new mapping is and then do something crazy with upmaps (move them manually to the new locations one by one and then remove all upmaps and change the rule)... but that's quite annoying to do and probably doesn't really help.
Paul
--
Paul Emmerich
Looking for help with your Ceph cluster? Contact us at https://croit.io
croit GmbH
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81247 München
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Paul Emmerich
Looking for help with your Ceph cluster? Contact us at https://croit.io
croit GmbH
Freseniusstr. 31h
81247 München
www.croit.io
Tel: +49 89 1896585 90
On Tue, Nov 19, 2019 at 11:11 AM Maarten van Ingen <maarten.vaningen@xxxxxxxxxxx> wrote:
_______________________________________________Hi,I have a small but impacting error in my crush rules.For unknown reasons the rules are not using host but osd to place the data and thus we have some nodes with all three copies instead of three different nodes.We noticed this when rebooting a node and a pg became stale.My crush rule:{"rule_id": 0,"rule_name": "replicated_rule","ruleset": 0,"type": 1,"min_size": 1,"max_size": 10,"steps": [{"op": "take","item": -2,"item_name": "default~hdd"},{"op": "chooseleaf_firstn","num": 0,"type": "osd"},{"op": "emit"}]},Type should be host of course. And I want to alter this and move pg's such that all is as should.How can I best proceed in correcting this issue? I do like to throttle the remapping of the data so ceph itself won't be unavailable while the data is redistributed.We are running on Mimic (13.2.6), and this environment has been installed freshly as Mimic while using ceph-ansible.Current ceph -s output:cluster:
id: <<fsid>
health: HEALTH_OK
services:
mon: 3 daemons, quorum mon01,mon02,mon03
mgr: mon01(active), standbys: mon02, mon03
mds: cephfs-2/2/2 up {0=mon03=up:active,1=mon01=up:active}, 1 up:standby
osd: 502 osds: 502 up, 502 in
data:
pools: 18 pools, 8192 pgs
objects: 28.74 M objects, 100 TiB
usage: 331 TiB used, 2.3 PiB / 2.6 PiB avail
pgs: 8192 active+clean
Cheers,
Maarten van Ingen
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