Dear Igor, Is the ceph-volume lvm migrate command smart enough in octopus 15.2.14 to be able to remove the db (included the wall) from the nvme even if it is spilledover? I can’t compact back to normal many disk to not show spillover warning.
I think Christian has the truth of the issue, my Nvme with 30k rand write iops backing 3x ssd with 67k rand write iops each … Istvan Szabo Senior Infrastructure Engineer --------------------------------------------------- Agoda Services Co., Ltd. e: istvan.sz...@agoda.com<mailto:istvan.sz...@agoda.com> --------------------------------------------------- On 2021. Oct 1., at 11:47, Szabo, Istvan (Agoda) <istvan.sz...@agoda.com> wrote: 3x SSD osd /nvme Istvan Szabo Senior Infrastructure Engineer --------------------------------------------------- Agoda Services Co., Ltd. e: istvan.sz...@agoda.com --------------------------------------------------- -----Original Message----- From: Igor Fedotov <ifedo...@suse.de> Sent: Friday, October 1, 2021 4:35 PM To: ceph-users@ceph.io Subject: [ceph-users] Re: is it possible to remove the db+wal from an external device (nvme) Email received from the internet. If in doubt, don't click any link nor open any attachment ! ________________________________ And how many OSDs are per single NVMe do you have? On 10/1/2021 9:55 AM, Szabo, Istvan (Agoda) wrote: I have my dashboards and I can see that the db nvmes are always running on 100% utilization (you can monitor with iostat -x 1) and it generates all the time iowaits which is between 1-3. I’m using nvme in front of the ssds. Istvan Szabo Senior Infrastructure Engineer --------------------------------------------------- Agoda Services Co., Ltd. e: istvan.sz...@agoda.com<mailto:istvan.sz...@agoda.com> --------------------------------------------------- From: Victor Hooi <victorh...@yahoo.com> Sent: Friday, October 1, 2021 5:30 AM To: Eugen Block <ebl...@nde.ag> Cc: Szabo, Istvan (Agoda) <istvan.sz...@agoda.com>; 胡 玮文 <huw...@outlook.com>; ceph-users <ceph-users@ceph.io> Subject: Re: [ceph-users] Re: is it possible to remove the db+wal from an external device (nvme) Email received from the internet. If in doubt, don't click any link nor open any attachment ! ________________________________ Hi, I'm curious - how did you tell that the separate WAL+DB volume was slowing things down? I assume you did some benchmarking - is there any chance you'd be willing to share results? (Or anybody else that's been in a similar situation). What sorts of devices are you using for the WAL+DB, versus the data disks? We're using NAND SSDs, with Optanes for the WAL+DB, and on some systems I am seeing slowly than expected behaviour - need to dive deeper into it In my case, I was running with 4 or 2 OSDs per Optane volume: https://www.reddit.com/r/ceph/comments/k2lef1/how_many_waldb_partition s_can_you_run_per_optane/ but I couldn't seem to get the results I'd expected - so curious what people are seeing in the real world - and of course, we might need to follow the steps here to remove them as well. Thanks, Victor On Thu, 30 Sept 2021 at 16:10, Eugen Block <ebl...@nde.ag<mailto:ebl...@nde.ag>> wrote: Yes, I believe for you it should work without containers although I haven't tried the migrate command in a non-containerized cluster yet. But I believe this is a general issue for containerized clusters with regards to maintenance. I haven't checked yet if there are existing tracker issues for this, but maybe this should be worth creating one? Zitat von "Szabo, Istvan (Agoda)" <istvan.sz...@agoda.com<mailto:istvan.sz...@agoda.com>>: Actually I don't have containerized deployment, my is normal one. So it should work the lvm migrate. Istvan Szabo Senior Infrastructure Engineer --------------------------------------------------- Agoda Services Co., Ltd. e: istvan.sz...@agoda.com<mailto:istvan.sz...@agoda.com> --------------------------------------------------- -----Original Message----- From: Eugen Block <ebl...@nde.ag<mailto:ebl...@nde.ag>> Sent: Wednesday, September 29, 2021 8:49 PM To: 胡 玮文 <huw...@outlook.com<mailto:huw...@outlook.com>> Cc: Igor Fedotov <ifedo...@suse.de<mailto:ifedo...@suse.de>>; Szabo, Istvan (Agoda) <istvan.sz...@agoda.com<mailto:istvan.sz...@agoda.com>>; ceph-users@ceph.io<mailto:ceph-users@ceph.io> Subject: Re: is it possible to remove the db+wal from an external device (nvme) Email received from the internet. If in doubt, don't click any link nor open any attachment ! ________________________________ That's what I did and pasted the results in my previous comments. Zitat von 胡 玮文 <huw...@outlook.com<mailto:huw...@outlook.com>>: Yes. And “cephadm shell” command does not depend on the running daemon, it will start a new container. So I think it is perfectly fine to stop the OSD first then run the “cephadm shell” command, and run ceph-volume in the new shell. 发件人: Eugen Block<mailto:ebl...@nde.ag<mailto:ebl...@nde.ag>> 发送时间: 2021年9月29日 21:40 收件人: 胡 玮文<mailto:huw...@outlook.com<mailto:huw...@outlook.com>> 抄送: Igor Fedotov<mailto:ifedo...@suse.de<mailto:ifedo...@suse.de>>; Szabo, Istvan (Agoda)<mailto:istvan.sz...@agoda.com<mailto:istvan.sz...@agoda.com> ; ceph-users@ceph.io<mailto:ceph-users@ceph.io><mailto:ceph-users@ceph .io<mailto:ceph-users@ceph.io>> 主题: Re: is it possible to remove the db+wal from an external device (nvme) The OSD has to be stopped in order to migrate DB/WAL, it can't be done live. ceph-volume requires a lock on the device. Zitat von 胡 玮文 <huw...@outlook.com<mailto:huw...@outlook.com>>: I’ve not tried it, but how about: cephadm shell -n osd.0 then run “ceph-volume” commands in the newly opened shell. The directory structure seems fine. $ sudo cephadm shell -n osd.0 Inferring fsid e88d509a-f6fc-11ea-b25d-a0423f3ac864 Inferring config /var/lib/ceph/e88d509a-f6fc-11ea-b25d-a0423f3ac864/osd.0/config Using recent ceph image cr.example.com/infra/ceph@sha256:8a0f6f285edcd6488e2c91d3f9fa43534d 37<http://cr.example.com/infra/ceph@sha256:8a0f6f285edcd6488e2c91d3 f9fa43534d37> d7a9b37db1e0ff6691aae6466530 root@host0:/# ll /var/lib/ceph/osd/ceph-0/ total 68 drwx------ 2 ceph ceph 4096 Sep 20 04:15 ./ drwxr-x--- 1 ceph ceph 4096 Sep 29 13:32 ../ lrwxrwxrwx 1 ceph ceph 24 Sep 20 04:15 block -> /dev/ceph-hdd/osd.0.data lrwxrwxrwx 1 ceph ceph 23 Sep 20 04:15 block.db -> /dev/ubuntu-vg/osd.0.db -rw------- 1 ceph ceph 37 Sep 20 04:15 ceph_fsid -rw------- 1 ceph ceph 387 Jun 21 13:24 config -rw------- 1 ceph ceph 37 Sep 20 04:15 fsid -rw------- 1 ceph ceph 55 Sep 20 04:15 keyring -rw------- 1 ceph ceph 6 Sep 20 04:15 ready -rw------- 1 ceph ceph 3 Apr 2 01:46 require_osd_release -rw------- 1 ceph ceph 10 Sep 20 04:15 type -rw------- 1 ceph ceph 38 Sep 17 14:26 unit.configured -rw------- 1 ceph ceph 48 Nov 9 2020 unit.created -rw------- 1 ceph ceph 35 Sep 17 14:26 unit.image -rw------- 1 ceph ceph 306 Sep 17 14:26 unit.meta -rw------- 1 ceph ceph 1317 Sep 17 14:26 unit.poststop -rw------- 1 ceph ceph 3021 Sep 17 14:26 unit.run -rw------- 1 ceph ceph 142 Sep 17 14:26 unit.stop -rw------- 1 ceph ceph 2 Sep 20 04:15 whoami 发件人: Eugen Block<mailto:ebl...@nde.ag<mailto:ebl...@nde.ag>> 发送时间: 2021年9月29日 21:29 收件人: Igor Fedotov<mailto:ifedo...@suse.de<mailto:ifedo...@suse.de>> 抄送: 胡 玮文<mailto:huw...@outlook.com<mailto:huw...@outlook.com>>; Szabo, Istvan (Agoda)<mailto:istvan.sz...@agoda.com<mailto:istvan.sz...@agoda.com ; ceph-users@ceph.io<mailto:ceph-users@ceph.io><mailto:ceph-users@cep h.io<mailto:ceph-users@ceph.io>> 主题: Re: [ceph-users] Re: 回复: [ceph-users] Re: is it possible to remove the db+wal from an external device (nvme) Hi Igor, thanks for your input. I haven't done this in a prod env yet either, still playing around in a virtual lab env. I tried the symlink suggestion but it's not that easy, because it looks different underneath the ceph directory than ceph-volume expects it. These are the services underneath: ses7-host1:~ # ll /var/lib/ceph/152fd738-01bc-11ec-a7fd-fa163e672db2/ insgesamt 48 drwx------ 3 root root 4096 16. Sep 16:11 alertmanager.ses7-host1 drwx------ 3 ceph ceph 4096 29. Sep 09:03 crash drwx------ 2 ceph ceph 4096 16. Sep 16:39 crash.ses7-host1 drwx------ 4 messagebus lp 4096 16. Sep 16:23 grafana.ses7-host1 drw-rw---- 2 root root 4096 24. Aug 10:00 home drwx------ 2 ceph ceph 4096 16. Sep 16:37 mgr.ses7-host1.wmgyit drwx------ 3 ceph ceph 4096 16. Sep 16:37 mon.ses7-host1 drwx------ 2 nobody nobody 4096 16. Sep 16:37 node-exporter.ses7-host1 drwx------ 2 ceph ceph 4096 29. Sep 08:43 osd.0 drwx------ 2 ceph ceph 4096 29. Sep 15:11 osd.1 drwx------ 4 root root 4096 16. Sep 16:12 prometheus.ses7-host1 While the directory in a non-containerized deployment looks like this: nautilus:~ # ll /var/lib/ceph/osd/ceph-0/ insgesamt 24 lrwxrwxrwx 1 ceph ceph 93 29. Sep 12:21 block -> /dev/ceph-a6d78a29-637f-494b-a839-76251fcff67e/osd-block-39340a48-5 4b 3-4689-9896-f54d005c535d -rw------- 1 ceph ceph 37 29. Sep 12:21 ceph_fsid -rw------- 1 ceph ceph 37 29. Sep 12:21 fsid -rw------- 1 ceph ceph 55 29. Sep 12:21 keyring -rw------- 1 ceph ceph 6 29. Sep 12:21 ready -rw------- 1 ceph ceph 10 29. Sep 12:21 type -rw------- 1 ceph ceph 2 29. Sep 12:21 whoami But even if I create the symlink to the osd directory it fails because I only have ceph-volume within the containers where the symlink is not visible to cephadm. ses7-host1:~ # ll /var/lib/ceph/osd/ceph-1 lrwxrwxrwx 1 root root 57 29. Sep 15:08 /var/lib/ceph/osd/ceph-1 -> /var/lib/ceph/152fd738-01bc-11ec-a7fd-fa163e672db2/osd.1/ ses7-host1:~ # cephadm ceph-volume lvm migrate --osd-id 1 --osd-fsid b4c772aa-07f8-483d-ae58-0ab97b8d0cc4 --from db --target ceph-b1ddff4b-95e8-4b91-b451-a3ea35d16ec0/osd-block-b4c772aa-07f8-4 83 d-ae58-0ab97b8d0cc4 Inferring fsid 152fd738-01bc-11ec-a7fd-fa163e672db2 [...] /usr/bin/podman: stderr --> Migrate to existing, Source: ['--devs-source', '/var/lib/ceph/osd/ceph-1/block.db'] Target: /var/lib/ceph/osd/ceph-1/block /usr/bin/podman: stderr stdout: inferring bluefs devices from bluestore path /usr/bin/podman: stderr stderr: can't migrate /var/lib/ceph/osd/ceph-1/block.db, not a valid bluefs volume /usr/bin/podman: stderr --> Failed to migrate device, error code:1 /usr/bin/podman: stderr --> Undoing lv tag set /usr/bin/podman: stderr Failed to migrate to : ceph-b1ddff4b-95e8-4b91-b451-a3ea35d16ec0/osd-block-b4c772aa-07f8-4 83 d-ae58-0ab97b8d0cc4 Traceback (most recent call last): File "/usr/sbin/cephadm", line 6225, in <module> r = args.func() File "/usr/sbin/cephadm", line 1363, in _infer_fsid return func() File "/usr/sbin/cephadm", line 1422, in _infer_image return func() File "/usr/sbin/cephadm", line 3687, in command_ceph_volume out, err, code = call_throws(c.run_cmd(), verbosity=CallVerbosity.VERBOSE) File "/usr/sbin/cephadm", line 1101, in call_throws raise RuntimeError('Failed command: %s' % ' '.join(command)) [...] I could install the package ceph-osd (where ceph-volume is packaged in) but it's not available by default (as you see this is a SES 7 environment). I'm not sure what the design is here, it feels like the ceph-volume migrate command is not applicable to containers yet. Regards, Eugen Zitat von Igor Fedotov <ifedo...@suse.de<mailto:ifedo...@suse.de>>: Hi Eugen, indeed this looks like an issue related to containerized deployment, "ceph-volume lvm migrate" expects osd folder to be under /var/lib/ceph/osd: stderr: 2021-09-29T06:56:24.787+0000 7fde05b96180 -1 bluestore(/var/lib/ceph/osd/ceph-1) _lock_fsid failed to lock /var/lib/ceph/osd/ceph-1/fsid (is another ceph-osd still running?)(11) Resource temporarily unavailable As a workaround you might want to try to create a symlink to your actual location before issuing the migrate command: /var/lib/ceph/osd -> /var/lib/ceph/152fd738-01bc-11ec-a7fd-fa163e672db2/ More complicated (and more general IMO) way would be to run the migrate command from within a container deployed similarly (i.e. with all the proper subfolder mappings) to ceph-osd one. Just speculating - not a big expert in containers and never tried that with properly deployed production cluster... Thanks, Igor On 9/29/2021 10:07 AM, Eugen Block wrote: Hi, I just tried with 'ceph-volume lvm migrate' in Octopus but it doesn't really work. I'm not sure if I'm missing something here, but I believe it's again the already discussed containers issue. To be able to run the command for an OSD the OSD has to be offline, but then you don't have access to the block.db because the path is different from outside the container: ---snip--- [ceph: root@host1 /]# ceph-volume lvm migrate --osd-id 1 --osd-fsid b4c772aa-07f8-483d-ae58-0ab97b8d0cc4 --from db --target ceph-b1ddff4b-95e8-4b91-b451-a3ea35d16ec0/osd-block-b4c772aa-07f8 -4 83d-ae58-0ab97b8d0cc4 --> Migrate to existing, Source: ['--devs-source', '/var/lib/ceph/osd/ceph-1/block.db'] Target: /var/lib/ceph/osd/ceph-1/block stdout: inferring bluefs devices from bluestore path stderr: /home/abuild/rpmbuild/BUILD/ceph-15.2.14-84-gb6e5642e260/src/os/b lu estore/BlueStore.cc: In function 'int BlueStore::_mount_for_bluefs()' thread 7fde05b96180 time 2021-09-29T06:56:24.790161+0000 stderr: /home/abuild/rpmbuild/BUILD/ceph-15.2.14-84-gb6e5642e260/src/os/b lu estore/BlueStore.cc: 6876: FAILED ceph_assert(r == 0) stderr: 2021-09-29T06:56:24.787+0000 7fde05b96180 -1 bluestore(/var/lib/ceph/osd/ceph-1) _lock_fsid failed to lock /var/lib/ceph/osd/ceph-1/fsid (is another ceph-osd still running?)(11) Resource temporarily unavailable # path outside host1:~ # ll /var/lib/ceph/152fd738-01bc-11ec-a7fd-fa163e672db2/osd.1/ insgesamt 60 lrwxrwxrwx 1 ceph ceph 93 29. Sep 08:43 block -> /dev/ceph-b1ddff4b-95e8-4b91-b451-a3ea35d16ec0/osd-block-b4c772aa-07f8-483d-ae58-0ab97b8d0cc4 lrwxrwxrwx 1 ceph ceph 90 29. Sep 08:43 block.db -> /dev/ceph-6f1b8f49-daf2-4631-a2ef-12e9452b01ea/osd-db-69b11aa0-af 96 -443e-8f03-5afa5272131f ---snip--- But if I shutdown the OSD I can't access the block and block.db devices. I'm not even sure how this is supposed to work with cephadm. Maybe I'm misunderstanding, though. Or is there a way to provide the offline block.db path to 'ceph-volume lvm migrate'? Zitat von 胡 玮文 <huw...@outlook.com<mailto:huw...@outlook.com>>: You may need to use `ceph-volume lvm migrate’ [1] instead of ceph-bluestore-tool. If I recall correctly, this is a pretty new feature, I’m not sure whether it is available to your version. If you use ceph-bluestore-tool, then you need to modify the LVM tags manually. Please refer to the previous threads, e.g. [2] and some more. [1]: https://docs.ceph.com/en/latest/man/8/ceph-volume/#migrate [2]: https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/ VX 23NQ66P3PPEX36T3PYYMHPLBSFLMYA/#JLNDFGXR4ZLY27DHD3RJTTZEDHRZJO4Q 发件人: Szabo, Istvan (Agoda)<mailto:istvan.sz...@agoda.com<mailto:Istvan.Szabo@agoda. com>> 发送时间: 2021年9月28日 18:20 收件人: Eugen Block<mailto:ebl...@nde.ag<mailto:ebl...@nde.ag>>; ceph-users@ceph.io<mailto:ceph-users@ceph.io><mailto:ceph-users@ ceph.io<mailto:ceph-users@ceph.io>> 主题: [ceph-users] Re: is it possible to remove the db+wal from an external device (nvme) Gave a try of it, so all the 3 osds finally failed :/ Not sure what went wrong. Do the normal maintenance things, ceph osd set noout, ceph osd set norebalance, stop the osd and run this command: ceph-bluestore-tool bluefs-bdev-migrate --dev-target /var/lib/ceph/osd/ceph-0/block --devs-source /var/lib/ceph/osd/ceph-8/block.db --path /var/lib/ceph/osd/ceph-8/ Output: device removed:1 /var/lib/ceph/osd/ceph-8/block.db device added: 1 /dev/dm-2 When tried to start I got this in the log: osd.8 0 OSD:init: unable to mount object store ** ERROR: osd init failed: (13) Permission denied set uid:gid to 167:167 (ceph:ceph) ceph version 15.2.13 (c44bc49e7a57a87d84dfff2a077a2058aa2172e2) octopus (stable), process ceph-osd, pid 1512261 pidfile_write: ignore empty --pid-file From the another 2 osds the block.db removed and I can start it back. I've zapped the db drive just to be removed from the device completely and after machine restart none of these 2 osds came back, I guess missing the db device. Is there any steps missing? 1.Noout+norebalance 2. Stop osd 3. migrate with the above command the block.db to the block. 4. do on the other osds which is sharing the same db device that want to remove. 5. zap the db device 6. start back the osds. Istvan Szabo Senior Infrastructure Engineer --------------------------------------------------- Agoda Services Co., Ltd. e: istvan.sz...@agoda.com<mailto:istvan.sz...@agoda.com> --------------------------------------------------- -----Original Message----- From: Eugen Block <ebl...@nde.ag<mailto:ebl...@nde.ag>> Sent: Monday, September 27, 2021 7:42 PM To: ceph-users@ceph.io<mailto:ceph-users@ceph.io> Subject: [ceph-users] Re: is it possible to remove the db+wal from an external device (nvme) Email received from the internet. If in doubt, don't click any link nor open any attachment ! ________________________________ Hi, I think 'ceph-bluestore-tool bluefs-bdev-migrate' could be of use here. I haven't tried it in a production environment yet, only in virtual labs. Regards, Eugen Zitat von "Szabo, Istvan (Agoda)" <istvan.sz...@agoda.com<mailto:istvan.sz...@agoda.com>>: Hi, Seems like in our config the nvme device as a wal+db in front of the ssd slowing down the ssds osds. I'd like to avoid to rebuild all the osd-, is there a way somehow migrate to the "slower device" the wal+db without reinstall? Ty _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io<mailto:ceph-users@ceph.io> To unsubscribe send an email to ceph-users-le...@ceph.io<mailto:ceph-users-le...@ceph.io> _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io<mailto:ceph-users@ceph.io> To unsubscribe send an email to ceph-users-le...@ceph.io<mailto:ceph-users-le...@ceph.io> _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io<mailto:ceph-users@ceph.io> To unsubscribe send an email to ceph-users-le...@ceph.io<mailto:ceph-users-le...@ceph.io> _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io<mailto:ceph-users@ceph.io> To unsubscribe send an email to ceph-users-le...@ceph.io<mailto:ceph-users-le...@ceph.io> _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io<mailto:ceph-users@ceph.io> To unsubscribe send an email to ceph-users-le...@ceph.io<mailto:ceph-users-le...@ceph.io> _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
