[Gluster-users] Rebalance failed on Distributed Disperse volume based on 3.12.14 version

Mauro Tridici mauro.tridici at cmcc.it
Wed Sep 26 13:24:19 UTC 2018


Hi Ashish,

in attachment you can find the rebalance log file and the last updated brick log file (the other files in /var/log/glusterfs/bricks directory seem to be too old).
I just stopped the running rebalance (as you can see at the bottom of the rebalance log file).
So, if exists a safe procedure to correct the problem I would like execute it.

I don’t know if I can ask you it, but, if it is possible, could you please describe me step by step the right procedure to remove the newly added bricks without losing the data that have been already rebalanced?

The following outputs show the result of “df -h” command executed on one of the first 3 nodes (s01, s02, s03) already existing  and on one of the last 3 nodes (s04, s05, s06) added recently.

[root at s06 bricks]# df -h
File system                          Dim. Usati Dispon. Uso% Montato su
/dev/mapper/cl_s06-root              100G  2,1G     98G   3% /
devtmpfs                              32G     0     32G   0% /dev
tmpfs                                 32G  4,0K     32G   1% /dev/shm
tmpfs                                 32G   26M     32G   1% /run
tmpfs                                 32G     0     32G   0% /sys/fs/cgroup
/dev/mapper/cl_s06-var               100G  2,0G     99G   2% /var
/dev/mapper/cl_s06-gluster           100G   33M    100G   1% /gluster
/dev/sda1                           1014M  152M    863M  15% /boot
/dev/mapper/gluster_vgd-gluster_lvd  9,0T  807G    8,3T   9% /gluster/mnt3
/dev/mapper/gluster_vgg-gluster_lvg  9,0T  807G    8,3T   9% /gluster/mnt6
/dev/mapper/gluster_vgc-gluster_lvc  9,0T  807G    8,3T   9% /gluster/mnt2
/dev/mapper/gluster_vge-gluster_lve  9,0T  807G    8,3T   9% /gluster/mnt4
/dev/mapper/gluster_vgj-gluster_lvj  9,0T  887G    8,2T  10% /gluster/mnt9
/dev/mapper/gluster_vgb-gluster_lvb  9,0T  807G    8,3T   9% /gluster/mnt1
/dev/mapper/gluster_vgh-gluster_lvh  9,0T  887G    8,2T  10% /gluster/mnt7
/dev/mapper/gluster_vgf-gluster_lvf  9,0T  807G    8,3T   9% /gluster/mnt5
/dev/mapper/gluster_vgi-gluster_lvi  9,0T  887G    8,2T  10% /gluster/mnt8
/dev/mapper/gluster_vgl-gluster_lvl  9,0T  887G    8,2T  10% /gluster/mnt11
/dev/mapper/gluster_vgk-gluster_lvk  9,0T  887G    8,2T  10% /gluster/mnt10
/dev/mapper/gluster_vgm-gluster_lvm  9,0T  887G    8,2T  10% /gluster/mnt12
tmpfs                                6,3G     0    6,3G   0% /run/user/0

[root at s01 ~]# df -h
File system                          Dim. Usati Dispon. Uso% Montato su
/dev/mapper/cl_s01-root              100G  5,3G     95G   6% /
devtmpfs                              32G     0     32G   0% /dev
tmpfs                                 32G   39M     32G   1% /dev/shm
tmpfs                                 32G   26M     32G   1% /run
tmpfs                                 32G     0     32G   0% /sys/fs/cgroup
/dev/mapper/cl_s01-var               100G   11G     90G  11% /var
/dev/md127                          1015M  151M    865M  15% /boot
/dev/mapper/cl_s01-gluster           100G   33M    100G   1% /gluster
/dev/mapper/gluster_vgi-gluster_lvi  9,0T  5,5T    3,6T  61% /gluster/mnt7
/dev/mapper/gluster_vgm-gluster_lvm  9,0T  5,4T    3,6T  61% /gluster/mnt11
/dev/mapper/gluster_vgf-gluster_lvf  9,0T  5,7T    3,4T  63% /gluster/mnt4
/dev/mapper/gluster_vgl-gluster_lvl  9,0T  5,8T    3,3T  64% /gluster/mnt10
/dev/mapper/gluster_vgj-gluster_lvj  9,0T  5,5T    3,6T  61% /gluster/mnt8
/dev/mapper/gluster_vgn-gluster_lvn  9,0T  5,4T    3,6T  61% /gluster/mnt12
/dev/mapper/gluster_vgk-gluster_lvk  9,0T  5,8T    3,3T  64% /gluster/mnt9
/dev/mapper/gluster_vgh-gluster_lvh  9,0T  5,6T    3,5T  63% /gluster/mnt6
/dev/mapper/gluster_vgg-gluster_lvg  9,0T  5,6T    3,5T  63% /gluster/mnt5
/dev/mapper/gluster_vge-gluster_lve  9,0T  5,7T    3,4T  63% /gluster/mnt3
/dev/mapper/gluster_vgc-gluster_lvc  9,0T  5,6T    3,5T  62% /gluster/mnt1
/dev/mapper/gluster_vgd-gluster_lvd  9,0T  5,6T    3,5T  62% /gluster/mnt2
tmpfs                                6,3G     0    6,3G   0% /run/user/0
s01-stg:tier2                        420T  159T    262T  38% /tier2

As you can see, used space value of each brick of the last servers is about 800GB.

Thank you,
Mauro



> Il giorno 26 set 2018, alle ore 14:51, Ashish Pandey <aspandey at redhat.com> ha scritto:
> 
> Hi Mauro,
> 
> rebalance and brick logs should be the first thing we should go through.
> 
> There is a procedure to correct the configuration/setup but the situation you are in is difficult to follow that procedure.
> You should have added the bricks hosted on s04-stg, s05-stg and s06-stg the same way you had the previous configuration.
> That means 2 bricks on each node for one subvolume.
> The procedure will require a lot of replace bricks which will again need healing and all. In addition to that we have to wait for re-balance to complete.
> 
> I would suggest that if whole data has not been rebalanced and if you can stop the rebalance and remove these newly added bricks properly then you should remove these newly added bricks.
> After that, add these bricks so that you have 2 bricks of each volume on 3 newly added nodes.
> 
> Yes, it is like undoing whole effort but it is better to do it now then facing issues in future when it will be almost impossible to correct these things if you have lots of data.
> 
> ---
> Ashish
> 
> 
> 
> From: "Mauro Tridici" <mauro.tridici at cmcc.it>
> To: "Ashish Pandey" <aspandey at redhat.com>
> Cc: "gluster-users" <gluster-users at gluster.org>
> Sent: Wednesday, September 26, 2018 5:55:02 PM
> Subject: Re: [Gluster-users] Rebalance failed on Distributed Disperse volume        based on 3.12.14 version
> 
> 
> Dear Ashish,
> 
> thank you for you answer.
> I could provide you the entire log file related to glusterd, glusterfsd and rebalance.
> Please, could you indicate which one you need first?
> 
> Yes, we added the last 36 bricks after creating vol. Is there a procedure to correct this error? Is it still possible to do it?
> 
> Many thanks,
> Mauro
> 
> Il giorno 26 set 2018, alle ore 14:13, Ashish Pandey <aspandey at redhat.com <mailto:aspandey at redhat.com>> ha scritto:
> 
> 
> I think we don't have enough logs to debug this so I would suggest you to provide more logs/info.
> I have also observed that the configuration and setup of your volume is not very efficient.
> 
> For example: 
> Brick37: s04-stg:/gluster/mnt1/brick
> Brick38: s04-stg:/gluster/mnt2/brick
> Brick39: s04-stg:/gluster/mnt3/brick
> Brick40: s04-stg:/gluster/mnt4/brick
> Brick41: s04-stg:/gluster/mnt5/brick
> Brick42: s04-stg:/gluster/mnt6/brick
> Brick43: s04-stg:/gluster/mnt7/brick
> Brick44: s04-stg:/gluster/mnt8/brick
> Brick45: s04-stg:/gluster/mnt9/brick
> Brick46: s04-stg:/gluster/mnt10/brick
> Brick47: s04-stg:/gluster/mnt11/brick
> Brick48: s04-stg:/gluster/mnt12/brick
> 
> These 12 bricks are on same node and the sub volume made up of these bricks will be of same subvolume, which is not good. Same is true for the bricks hosted on s05-stg and s06-stg
> I think you have added these bricks after creating vol. The probability of disruption in connection of these bricks will be higher in this case.
> 
> ---
> Ashish
> 
> From: "Mauro Tridici" <mauro.tridici at cmcc.it <mailto:mauro.tridici at cmcc.it>>
> To: "gluster-users" <gluster-users at gluster.org <mailto:gluster-users at gluster.org>>
> Sent: Wednesday, September 26, 2018 3:38:35 PM
> Subject: [Gluster-users] Rebalance failed on Distributed Disperse volume        based on 3.12.14 version
> 
> Dear All, Dear Nithya,
> 
> after upgrading from 3.10.5 version to 3.12.14, I tried to start a rebalance process to distribute data across the bricks, but something goes wrong.
> Rebalance failed on different nodes and the time value needed to complete the procedure seems to be very high.
> 
> [root at s01 ~]# gluster volume rebalance tier2 status
>                                     Node Rebalanced-files          size       scanned      failures       skipped               status  run time in h:m:s
>                                ---------      -----------   -----------   -----------   -----------   -----------         ------------     --------------
>                                localhost               19       161.6GB           537             2             2          in progress        0:32:23
>                                  s02-stg               25       212.7GB           526             5             2          in progress        0:32:25
>                                  s03-stg                4        69.1GB           511             0             0          in progress        0:32:25
>                                  s04-stg                4      484Bytes         12283             0             3          in progress        0:32:25
>                                  s05-stg               23      484Bytes         11049             0            10          in progress        0:32:25
>                                  s06-stg                3         1.2GB          8032            11             3               failed        0:17:57
> Estimated time left for rebalance to complete :     3601:05:41
> volume rebalance: tier2: success
> 
> When rebalance processes fail, I can see the following kind of errors in /var/log/glusterfs/tier2-rebalance.log
> 
> Error type 1)
> 
> [2018-09-26 08:50:19.872575] W [MSGID: 122053] [ec-common.c:269:ec_check_status] 0-tier2-disperse-10: Operation failed on 2 of 6 subvolumes.(up=111111, mask=100111, remaining=
> 000000, good=100111, bad=011000)
> [2018-09-26 08:50:19.901792] W [MSGID: 122053] [ec-common.c:269:ec_check_status] 0-tier2-disperse-11: Operation failed on 1 of 6 subvolumes.(up=111111, mask=111101, remaining=
> 000000, good=111101, bad=000010)
> 
> Error type 2)
> 
> [2018-09-26 08:53:31.566836] W [socket.c:600:__socket_rwv] 0-tier2-client-53: readv on 192.168.0.55:49153 failed (Connection reset by peer)
> 
> Error type 3)
> 
> [2018-09-26 08:57:37.852590] W [MSGID: 122035] [ec-common.c:571:ec_child_select] 0-tier2-disperse-9: Executing operation with some subvolumes unavailable (10)
> [2018-09-26 08:57:39.282306] W [MSGID: 122035] [ec-common.c:571:ec_child_select] 0-tier2-disperse-9: Executing operation with some subvolumes unavailable (10)
> [2018-09-26 09:02:04.928408] W [MSGID: 109023] [dht-rebalance.c:1013:__dht_check_free_space] 0-tier2-dht: data movement of file {blocks:0 name:(/OPA/archive/historical/dts/MRE
> A/Observations/Observations/MREA14/Cs-1/CMCC/raw/CS013.ext)} would result in dst node (tier2-disperse-5:2440190848) having lower disk space than the source node (tier2-dispers
> e-11:71373083776).Skipping file.
> 
> Error type 4)
> 
> W [rpc-clnt-ping.c:223:rpc_clnt_ping_cbk] 0-tier2-client-7: socket disconnected
> 
> Error type 5)
> 
> [2018-09-26 09:07:42.333720] W [glusterfsd.c:1375:cleanup_and_exit] (-->/lib64/libpthread.so.0(+0x7e25) [0x7f0417e0ee25] -->/usr/sbin/glusterfs(glusterfs_sigwaiter+0xe5) [0x55
> 90086004b5] -->/usr/sbin/glusterfs(cleanup_and_exit+0x6b) [0x55900860032b] ) 0-: received signum (15), shutting down
> 
> Error type 6)
> 
> [2018-09-25 08:09:18.340658] C [rpc-clnt-ping.c:166:rpc_clnt_ping_timer_expired] 0-tier2-client-4: server 192.168.0.52:49153 has not responded in the last 42 seconds, disconnecting.
> 
> It seems that there are some network or timeout problems, but the network usage/traffic values are not so high.
> Do you think that, in my volume configuration, I have to modify some volume options related to thread and/or network parameters?
> Could you, please, help me to understand the cause of the problems above?
> 
> You can find below our volume info:
> (volume is implemented on 6 servers; each server configuration:  2 cpu 10-cores, 64GB RAM, 1 SSD dedicated to the OS, 12 x 10TB HD)
> 
> [root at s04 ~]# gluster vol info
>  
> Volume Name: tier2
> Type: Distributed-Disperse
> Volume ID: a28d88c5-3295-4e35-98d4-210b3af9358c
> Status: Started
> Snapshot Count: 0
> Number of Bricks: 12 x (4 + 2) = 72
> Transport-type: tcp
> Bricks:
> Brick1: s01-stg:/gluster/mnt1/brick
> Brick2: s02-stg:/gluster/mnt1/brick
> Brick3: s03-stg:/gluster/mnt1/brick
> Brick4: s01-stg:/gluster/mnt2/brick
> Brick5: s02-stg:/gluster/mnt2/brick
> Brick6: s03-stg:/gluster/mnt2/brick
> Brick7: s01-stg:/gluster/mnt3/brick
> Brick8: s02-stg:/gluster/mnt3/brick
> Brick9: s03-stg:/gluster/mnt3/brick
> Brick10: s01-stg:/gluster/mnt4/brick
> Brick11: s02-stg:/gluster/mnt4/brick
> Brick12: s03-stg:/gluster/mnt4/brick
> Brick13: s01-stg:/gluster/mnt5/brick
> Brick14: s02-stg:/gluster/mnt5/brick
> Brick15: s03-stg:/gluster/mnt5/brick
> Brick16: s01-stg:/gluster/mnt6/brick
> Brick17: s02-stg:/gluster/mnt6/brick
> Brick18: s03-stg:/gluster/mnt6/brick
> Brick19: s01-stg:/gluster/mnt7/brick
> Brick20: s02-stg:/gluster/mnt7/brick
> Brick21: s03-stg:/gluster/mnt7/brick
> Brick22: s01-stg:/gluster/mnt8/brick
> Brick23: s02-stg:/gluster/mnt8/brick
> Brick24: s03-stg:/gluster/mnt8/brick
> Brick25: s01-stg:/gluster/mnt9/brick
> Brick26: s02-stg:/gluster/mnt9/brick
> Brick27: s03-stg:/gluster/mnt9/brick
> Brick28: s01-stg:/gluster/mnt10/brick
> Brick29: s02-stg:/gluster/mnt10/brick
> Brick30: s03-stg:/gluster/mnt10/brick
> Brick31: s01-stg:/gluster/mnt11/brick
> Brick32: s02-stg:/gluster/mnt11/brick
> Brick33: s03-stg:/gluster/mnt11/brick
> Brick34: s01-stg:/gluster/mnt12/brick
> Brick35: s02-stg:/gluster/mnt12/brick
> Brick36: s03-stg:/gluster/mnt12/brick
> Brick37: s04-stg:/gluster/mnt1/brick
> Brick38: s04-stg:/gluster/mnt2/brick
> Brick39: s04-stg:/gluster/mnt3/brick
> Brick40: s04-stg:/gluster/mnt4/brick
> Brick41: s04-stg:/gluster/mnt5/brick
> Brick42: s04-stg:/gluster/mnt6/brick
> Brick43: s04-stg:/gluster/mnt7/brick
> Brick44: s04-stg:/gluster/mnt8/brick
> Brick45: s04-stg:/gluster/mnt9/brick
> Brick46: s04-stg:/gluster/mnt10/brick
> Brick47: s04-stg:/gluster/mnt11/brick
> Brick48: s04-stg:/gluster/mnt12/brick
> Brick49: s05-stg:/gluster/mnt1/brick
> Brick50: s05-stg:/gluster/mnt2/brick
> Brick51: s05-stg:/gluster/mnt3/brick
> Brick52: s05-stg:/gluster/mnt4/brick
> Brick53: s05-stg:/gluster/mnt5/brick
> Brick54: s05-stg:/gluster/mnt6/brick
> Brick55: s05-stg:/gluster/mnt7/brick
> Brick56: s05-stg:/gluster/mnt8/brick
> Brick57: s05-stg:/gluster/mnt9/brick
> Brick58: s05-stg:/gluster/mnt10/brick
> Brick59: s05-stg:/gluster/mnt11/brick
> Brick60: s05-stg:/gluster/mnt12/brick
> Brick61: s06-stg:/gluster/mnt1/brick
> Brick62: s06-stg:/gluster/mnt2/brick
> Brick63: s06-stg:/gluster/mnt3/brick
> Brick64: s06-stg:/gluster/mnt4/brick
> Brick65: s06-stg:/gluster/mnt5/brick
> Brick66: s06-stg:/gluster/mnt6/brick
> Brick67: s06-stg:/gluster/mnt7/brick
> Brick68: s06-stg:/gluster/mnt8/brick
> Brick69: s06-stg:/gluster/mnt9/brick
> Brick70: s06-stg:/gluster/mnt10/brick
> Brick71: s06-stg:/gluster/mnt11/brick
> Brick72: s06-stg:/gluster/mnt12/brick
> Options Reconfigured:
> network.ping-timeout: 60
> diagnostics.count-fop-hits: on
> diagnostics.latency-measurement: on
> cluster.server-quorum-type: server
> features.default-soft-limit: 90
> features.quota-deem-statfs: on
> performance.io <http://performance.io/>-thread-count: 16
> disperse.cpu-extensions: auto
> performance.io <http://performance.io/>-cache: off
> network.inode-lru-limit: 50000
> performance.md-cache-timeout: 600
> performance.cache-invalidation: on
> performance.stat-prefetch: on
> features.cache-invalidation-timeout: 600
> features.cache-invalidation: on
> cluster.readdir-optimize: on
> performance.parallel-readdir: off
> performance.readdir-ahead: on
> cluster.lookup-optimize: on
> client.event-threads: 4
> server.event-threads: 4
> nfs.disable: on
> transport.address-family: inet
> cluster.quorum-type: auto
> cluster.min-free-disk: 10
> performance.client-io-threads: on
> features.quota: on
> features.inode-quota: on
> features.bitrot: on
> features.scrub: Active
> cluster.brick-multiplex: on
> cluster.server-quorum-ratio: 51%
> 
> If it can help, I paste here the output of “free -m” command executed on all the cluster nodes:
> 
> The result is almost the same on every nodes. In your opinion, the available RAM is enough to support data movement?
> 
> [root at s06 ~]# free -m
>               total        used        free      shared  buff/cache   available
> Mem:          64309       10409         464          15       53434       52998
> Swap:         65535         103       65432
> 
> Thank you in advance.
> Sorry for my long message, but I’m trying to notify you all available information.
> 
> Regards,
> Mauro
> 
> 
> 
> 
> 
> 
> 
> 
> 
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> 
> 
> 
> 
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