[Gluster-users] Failures during rebalance on gluster distributed disperse volume

[Mauro Tridici]

Dear All,

I recently added 3 servers (each one with 12 bricks) to an existing Gluster Distributed Disperse Volume.
Volume extension has been completed without error and I already executed the rebalance procedure with fix-layout option with no problem.
I just launched the rebalance procedure without fix-layout option, but, as you can see in the output below, I noticed that some failures have been detected.

[root at s01 glusterfs]# gluster v rebalance tier2 status
                                    Node Rebalanced-files          size       scanned      failures       skipped               status  run time in h:m:s
                               ---------      -----------   -----------   -----------   -----------   -----------         ------------     --------------
                               localhost            71176         3.2MB       2137557       1530391          8128          in progress       13:59:05
                                 s02-stg                0        0Bytes             0             0             0            completed       11:53:28
                                 s03-stg                0        0Bytes             0             0             0            completed       11:53:32
                                 s04-stg                0        0Bytes             0             0             0            completed        0:00:06
                                 s05-stg               15        0Bytes         17055             0            18            completed       10:48:01
                                 s06-stg                0        0Bytes             0             0             0            completed        0:00:06
Estimated time left for rebalance to complete :        0:46:53
volume rebalance: tier2: success

In the volume rebalance log file, I detected a lot of error messages similar to the following ones:

[2018-09-12 13:15:50.756703] E [MSGID: 0] [dht-rebalance.c:1696:dht_migrate_file] 0-tier2-dht: Create dst failed on - tier2-disperse-6 for file - /CSP/sp1/CESM/archive/sps_200508_003/atm/hist/postproc/sps_200508_003.cam.h0.2005-12_grid.nc
[2018-09-12 13:15:50.757025] E [MSGID: 109023] [dht-rebalance.c:2733:gf_defrag_migrate_single_file] 0-tier2-dht: migrate-data failed for /CSP/sp1/CESM/archive/sps_200508_003/atm/hist/postproc/sps_200508_003.cam.h0.2005-12_grid.nc
[2018-09-12 13:15:50.759183] E [MSGID: 109023] [dht-rebalance.c:844:__dht_rebalance_create_dst_file] 0-tier2-dht: fallocate failed for /CSP/sp1/CESM/archive/sps_200508_003/atm/hist/postproc/sps_200508_003.cam.h0.2005-09_grid.nc on tier2-disperse-9 (Operation not supported)
[2018-09-12 13:15:50.759206] E [MSGID: 0] [dht-rebalance.c:1696:dht_migrate_file] 0-tier2-dht: Create dst failed on - tier2-disperse-9 for file - /CSP/sp1/CESM/archive/sps_200508_003/atm/hist/postproc/sps_200508_003.cam.h0.2005-09_grid.nc
[2018-09-12 13:15:50.759536] E [MSGID: 109023] [dht-rebalance.c:2733:gf_defrag_migrate_single_file] 0-tier2-dht: migrate-data failed for /CSP/sp1/CESM/archive/sps_200508_003/atm/hist/postproc/sps_200508_003.cam.h0.2005-09_grid.nc
[2018-09-12 13:15:50.777219] E [MSGID: 109023] [dht-rebalance.c:844:__dht_rebalance_create_dst_file] 0-tier2-dht: fallocate failed for /CSP/sp1/CESM/archive/sps_200508_003/atm/hist/postproc/sps_200508_003.cam.h0.2006-01_grid.nc on tier2-disperse-10 (Operation not supported)
[2018-09-12 13:15:50.777241] E [MSGID: 0] [dht-rebalance.c:1696:dht_migrate_file] 0-tier2-dht: Create dst failed on - tier2-disperse-10 for file - /CSP/sp1/CESM/archive/sps_200508_003/atm/hist/postproc/sps_200508_003.cam.h0.2006-01_grid.nc
[2018-09-12 13:15:50.777676] E [MSGID: 109023] [dht-rebalance.c:2733:gf_defrag_migrate_single_file] 0-tier2-dht: migrate-data failed for /CSP/sp1/CESM/archive/sps_200508_003/atm/hist/postproc/sps_200508_003.cam.h0.2006-01_grid.nc

Could you please help me to understand what is happening and how to solve it?

Our Gluster implementation is based on Gluster v.3.10.5

Thank you in advance,
Mauro

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