Hi Dan, thanks for pointing me to this. Yes, it looks like a/the bug, the shadow tree is not changed although it should be updated as well. This is not even shown in the crush map I exported with getcrushmap. The option --show-shadow did the trick. Will `ceph osd crush reweight-all` actually remove these shadow leafs or just set the weight to 0? I need to link this host later again and I would like a solution as clean as possible. What would, for example, happen if I edit the crush map and execute setcrushmap? Will it recompile the correct crush map from the textual definition, or will these hanging leafs persist? Thanks! ================= Frank Schilder AIT Risø Campus Bygning 109, rum S14 ________________________________________ From: Dan van der Ster <dvanders@xxxxxxxxx> Sent: 18 May 2022 12:04:07 To: Frank Schilder Cc: ceph-users Subject: Re: No rebalance after ceph osd crush unlink Hi Frank, Did you check the shadow tree (the one with tilde's in the name, seen with `ceph osd crush tree --show-shadow`)? Maybe the host was removed in the outer tree, but not the one used for device-type selection. There were bugs in this area before, e.g. https://tracker.ceph.com/issues/48065 In those cases, the way to make the crush tree consistent again was `ceph osd crush reweight-all`. Cheers, Dan On Wed, May 18, 2022 at 11:51 AM Frank Schilder <frans@xxxxxx> wrote: > > Dear all, > > I have a strange problem. I have some hosts linked under an additional logical data center and needed to unlink two of the hosts. After unlinking the first host with > > ceph osd crush unlink ceph-18 MultiSite > > the crush map for this data center is updated correctly: > > datacenter MultiSite { > id -148 # do not change unnecessarily > id -149 class hdd # do not change unnecessarily > id -150 class ssd # do not change unnecessarily > id -236 class rbd_meta # do not change unnecessarily > id -200 class rbd_data # do not change unnecessarily > id -320 class rbd_perf # do not change unnecessarily > # weight 643.321 > alg straw2 > hash 0 # rjenkins1 > item ceph-04 weight 79.691 > item ceph-05 weight 81.474 > item ceph-06 weight 79.691 > item ceph-07 weight 79.691 > item ceph-19 weight 81.695 > item ceph-20 weight 81.695 > item ceph-21 weight 79.691 > item ceph-22 weight 79.691 > } > > The host is gone. However, nothing happened. The pools with the crush rule > > rule ms-ssd { > id 12 > type replicated > min_size 1 > max_size 10 > step take MultiSite class rbd_data > step chooseleaf firstn 0 type host > step emit > } > > should now move data away from OSDs on this host, but nothing is happening. A pool with crush rule ms-ssd is: > > # ceph osd pool get sr-rbd-meta-one all > size: 3 > min_size: 2 > pg_num: 128 > pgp_num: 128 > crush_rule: ms-ssd > hashpspool: true > nodelete: true > nopgchange: false > nosizechange: false > write_fadvise_dontneed: false > noscrub: false > nodeep-scrub: false > use_gmt_hitset: 1 > auid: 0 > fast_read: 0 > > However, its happily keeping data on the OSDs of host ceph-18. For example, one of the OSDs on this host has ID 1076. There are 4 PGs using this OSD: > > # ceph pg ls-by-pool sr-rbd-meta-one | grep 1076 > 1.33 250 0 0 0 756156481 7834 125 3073 active+clean 2022-05-18 10:54:41.840097 757122'10112944 757122:84604327 [574,286,1076]p574 [574,286,1076]p574 2022-05-18 04:24:32.900261 2022-05-11 19:56:32.781889 > 1.3d 259 0 0 0 796239360 3380 64 3006 active+clean 2022-05-18 10:54:41.749090 757122'24166942 757122:57010202 [1074,1076,1052]p1074 [1074,1076,1052]p1074 2022-05-18 06:16:35.605026 2022-05-16 19:37:56.829763 > 1.4d 249 0 0 0 713678948 5690 105 3070 active+clean 2022-05-18 10:54:41.738918 757119'5861104 757122:45718157 [1072,262,1076]p1072 [1072,262,1076]p1072 2022-05-18 06:50:04.731194 2022-05-18 06:50:04.731194 > 1.70 272 0 0 0 814317398 4591 76 3007 active+clean 2022-05-18 10:54:41.743604 757122'11849453 757122:72537747 [268,279,1076]p268 [268,279,1076]p268 2022-05-17 15:43:46.512941 2022-05-17 15:43:46.512941 > > I don't understand why these are not remapped and rebalancing. Any ideas? > > Version is mimic latest. > > Thanks and best regards, > ================= > Frank Schilder > AIT Risø Campus > Bygning 109, rum S14 > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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