Re: Rebalance failed on Distributed Disperse volume based on 3.12.14 version

Ashish Pandey <aspandey@xxxxxxxxxx> · Wed, 26 Sep 2018 08:51:10 -0400 (EDT)

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@xxxxxxx>
To: "Ashish Pandey" <aspandey@xxxxxxxxxx>
Cc: "gluster-users" <gluster-users@xxxxxxxxxxx>
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@xxxxxxxxxx> 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/brickBrick38: 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@xxxxxxx>
To: "gluster-users" <gluster-users@xxxxxxxxxxx>
Sent: Wednesday, September 26, 2018 3:38:35 PM
Subject:  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@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@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-thread-count: 16
disperse.cpu-extensions: auto
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@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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