[Gluster-users] distribute remove-brick has started migrating the wrong brick (glusterfs 3.8.13)
Nithya Balachandran
nbalacha at redhat.com
Wed Dec 12 03:07:20 UTC 2018
This is the current behaviour of rebalance and nothing to be concerned
about - it will migrate data on all bricks on the nodes which host the
bricks being removed. The data on the removed bricks will be moved to other
bricks, some of the data on the other bricks on the node will just be
moved to other bricks based on the new directory layouts.
I will fix this in the near future but you don't need to to stop the
remove-brick operation.
Regards,
Nithya
On Wed, 12 Dec 2018 at 06:36, Stephen Remde <stephen.remde at gaist.co.uk>
wrote:
> I requested a brick be removed from a distribute only volume and it seems to be migrating data from the wrong brick... unless I am reading this wrong which I doubt because the disk usage is definitely decreasing on the wrong brick.
>
> gluster> volume status
> Status of volume: video-backup
> Gluster process TCP Port RDMA Port Online Pid
> ------------------------------------------------------------------------------
> Brick 10.0.0.41:/export/md0/brick 49172 0 Y 5306
> Brick 10.0.0.42:/export/md0/brick 49172 0 Y 3651
> Brick 10.0.0.43:/export/md0/brick 49155 0 Y 2826
> Brick 10.0.0.41:/export/md1/brick 49173 0 Y 5311
> Brick 10.0.0.42:/export/md1/brick 49173 0 Y 3656
> Brick 10.0.0.41:/export/md2/brick 49174 0 Y 5316
> Brick 10.0.0.42:/export/md2/brick 49174 0 Y 3662
> Brick 10.0.0.41:/export/md3/brick 49175 0 Y 5322
> Brick 10.0.0.42:/export/md3/brick 49175 0 Y 3667
> Brick 10.0.0.43:/export/md1/brick 49156 0 Y 4836
>
> Task Status of Volume video-backup
> ------------------------------------------------------------------------------
> Task : Rebalance
> ID : 7895be7c-4ab9-440d-a301-c11dae0dd9e1
> Status : completed
>
> gluster> volume remove-brick video-backup 10.0.0.43:/export/md1/brick start
> volume remove-brick start: success
> ID: f666a196-03c2-4940-bd38-45d8383345a4
>
> gluster> volume status
> Status of volume: video-backup
> Gluster process TCP Port RDMA Port Online Pid
> ------------------------------------------------------------------------------
> Brick 10.0.0.41:/export/md0/brick 49172 0 Y 5306
> Brick 10.0.0.42:/export/md0/brick 49172 0 Y 3651
> Brick 10.0.0.43:/export/md0/brick 49155 0 Y 2826
> Brick 10.0.0.41:/export/md1/brick 49173 0 Y 5311
> Brick 10.0.0.42:/export/md1/brick 49173 0 Y 3656
> Brick 10.0.0.41:/export/md2/brick 49174 0 Y 5316
> Brick 10.0.0.42:/export/md2/brick 49174 0 Y 3662
> Brick 10.0.0.41:/export/md3/brick 49175 0 Y 5322
> Brick 10.0.0.42:/export/md3/brick 49175 0 Y 3667
> Brick 10.0.0.43:/export/md1/brick 49156 0 Y 4836
>
> Task Status of Volume video-backup
> ------------------------------------------------------------------------------
> Task : Remove brick
> ID : f666a196-03c2-4940-bd38-45d8383345a4
> Removed bricks:
> 10.0.0.43:/export/md1/brick
> Status : in progress
>
>
> But when I check the rebalance log on the host with the brick being removed, it is actually migrating data from the other brick on the same host 10.0.0.43:/export/md0/brick
>
>
> .....
> [2018-12-11 11:59:52.572657] I [MSGID: 109086] [dht-shared.c:297:dht_parse_decommissioned_bricks] 0-video-backup-dht: *decommissioning subvolume video-backup-client-9*
> ....
> 29: volume video-backup-client-2
> 30: type protocol/client
> 31: option clnt-lk-version 1
> 32: option volfile-checksum 0
> 33: option volfile-key rebalance/video-backup
> 34: option client-version 3.8.15
> 35: option process-uuid node-dc4-03-25536-2018/12/11-11:59:47:551328-video-backup-client-2-0-0
> 36: option fops-version 1298437
> 37: option ping-timeout 42
> 38: option remote-host 10.0.0.43
> 39: option remote-subvolume /export/md0/brick
> 40: option transport-type socket
> 41: option transport.address-family inet
> 42: option username 9e7fe743-ecd7-40aa-b3db-e112086b2fc7
> 43: option password dab178d6-ecb4-4293-8c1d-6281ec2cafc2
> 44: end-volume
> ...
> 112: volume video-backup-client-9
> 113: type protocol/client
> 114: option ping-timeout 42
> 115: option remote-host 10.0.0.43
> 116: option remote-subvolume /export/md1/brick
> 117: option transport-type socket
> 118: option transport.address-family inet
> 119: option username 9e7fe743-ecd7-40aa-b3db-e112086b2fc7
> 120: option password dab178d6-ecb4-4293-8c1d-6281ec2cafc2
> 121: end-volume
> ...
> [2018-12-11 11:59:52.608698] I [dht-rebalance.c:3668:gf_defrag_start_crawl] 0-video-backup-dht: gf_defrag_start_crawl using commit hash 3766302106
> [2018-12-11 11:59:52.609478] I [MSGID: 109081] [dht-common.c:4198:dht_setxattr] 0-video-backup-dht: fixing the layout of /
> [2018-12-11 11:59:52.615348] I [MSGID: 0] [dht-rebalance.c:3746:gf_defrag_start_crawl] 0-video-backup-dht: local subvols are video-backup-client-2
> [2018-12-11 11:59:52.615378] I [MSGID: 0] [dht-rebalance.c:3746:gf_defrag_start_crawl] 0-video-backup-dht: local subvols are video-backup-client-9
> ...
> [2018-12-11 11:59:52.616554] I [dht-rebalance.c:2652:gf_defrag_process_dir] 0-video-backup-dht: migrate data called on /
> [2018-12-11 11:59:54.000363] I [dht-rebalance.c:1230:dht_migrate_file] 0-video-backup-dht: /symlinks.txt: attempting to move from video-backup-client-2 to video-backup-client-4
> [2018-12-11 11:59:55.110549] I [MSGID: 109022] [dht-rebalance.c:1703:dht_migrate_file] 0-video-backup-dht: completed migration of /symlinks.txt from subvolume video-backup-client-2 to video-backup-client-4
> [2018-12-11 11:59:58.100931] I [MSGID: 109081] [dht-common.c:4198:dht_setxattr] 0-video-backup-dht: fixing the layout of /A6
> [2018-12-11 11:59:58.107389] I [dht-rebalance.c:2652:gf_defrag_process_dir] 0-video-backup-dht: migrate data called on /A6
> [2018-12-11 11:59:58.132138] I [dht-rebalance.c:2866:gf_defrag_process_dir] 0-video-backup-dht: Migration operation on dir /A6 took 0.02 secs
> [2018-12-11 11:59:58.330393] I [MSGID: 109081] [dht-common.c:4198:dht_setxattr] 0-video-backup-dht: fixing the layout of /A6/2017
> [2018-12-11 11:59:58.337601] I [dht-rebalance.c:2652:gf_defrag_process_dir] 0-video-backup-dht: migrate data called on /A6/2017
> [2018-12-11 11:59:58.493906] I [dht-rebalance.c:1230:dht_migrate_file] 0-video-backup-dht: /A6/2017/57c81ed09f31cd6c1c8990ae20160908101048: attempting to move from video-backup-client-2 to video-backup-client-4
> [2018-12-11 11:59:58.706068] I [dht-rebalance.c:1230:dht_migrate_file] 0-video-backup-dht: /A6/2017/57c81ed09f31cd6c1c8990ae20160908120734132317: attempting to move from video-backup-client-2 to video-backup-client-4
> [2018-12-11 11:59:58.783952] I [dht-rebalance.c:1230:dht_migrate_file] 0-video-backup-dht: /A6/2017/584a8bcdaca0515f595dff8820161124091841: attempting to move from video-backup-client-2 to video-backup-client-4
> [2018-12-11 11:59:58.843315] I [dht-rebalance.c:1230:dht_migrate_file] 0-video-backup-dht: /A6/2017/584a8bcdaca0515f595dff8820161124135453: attempting to move from video-backup-client-2 to video-backup-client-4
> [2018-12-11 11:59:58.951637] I [dht-rebalance.c:1230:dht_migrate_file] 0-video-backup-dht: /A6/2017/584a8bcdaca0515f595dff8820161122111252: attempting to move from video-backup-client-2 to video-backup-client-4
> [2018-12-11 11:59:59.005324] I [dht-rebalance.c:2866:gf_defrag_process_dir] 0-video-backup-dht: Migration operation on dir /A6/2017 took 0.67 secs
> [2018-12-11 11:59:59.005362] I [dht-rebalance.c:1230:dht_migrate_file] 0-video-backup-dht: /A6/2017/58906aaaaca0515f5994104d20170213154555: attempting to move from video-backup-client-2 to video-backup-client-4
>
> etc...
>
> Can I stop/cancel it without data loss? How can I make gluster remove the correct brick?
>
> Thanks
>
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