Re: Distributed re-balance issue

[Mohammed Rafi K C <rkavunga@xxxxxxxxxx>]

On 05/23/2017 08:53 PM, Mahdi Adnan wrote:

Hi,

I have a distributed volume with 6 bricks, each have 5TB and it's hosting large qcow2 VM disks (I know it's reliable but it's not important data)

I started with 5 bricks and then added another one, started the re balance process, everything went well, but now im looking at the bricks free space and i found one brick is around 82% while others ranging from 20% to 60%.

The brick with highest utilization is hosting more qcow2 disk than other bricks, and whenever i start re balance it just complete in 0 seconds and without moving any data.

How much is your average file size in the cluster? And number of files (roughly) .

What will happen with the brick became full ?

Once brick contents goes beyond 90%, new files won't be created in the brick. But existing files can grow.

Can i move data manually from one brick to the other ?

Nop.It is not recommended, even though gluster will try to find the file, it may break.

Why re balance not distributing data evenly on all bricks ?

Rebalance works based on layout, so we need to see how layouts are distributed. If one of your bricks has higher capacity, it will have larger layout.

Nodes runing CentOS 7.3

Gluster 3.8.11

Volume info;

Volume Name: ctvvols

Type: Distribute

Volume ID: 1ecea912-510f-4079-b437-7398e9caa0eb

Status: Started

Snapshot Count: 0

Number of Bricks: 6

Transport-type: tcp

Bricks:

Brick1: ctv01:/vols/ctvvols

Brick2: ctv02:/vols/ctvvols

Brick3: ctv03:/vols/ctvvols

Brick4: ctv04:/vols/ctvvols

Brick5: ctv05:/vols/ctvvols

Brick6: ctv06:/vols/ctvvols

Options Reconfigured:

nfs.disable: on

performance.readdir-ahead: on

transport.address-family: inet

performance.quick-read: off

performance.read-ahead: off

performance.io-cache: off

performance.stat-prefetch: off

performance.low-prio-threads: 32

network.remote-dio: enable

cluster.eager-lock: enable

cluster.quorum-type: none

cluster.server-quorum-type: server

cluster.data-self-heal-algorithm: full

cluster.locking-scheme: granular

cluster.shd-max-threads: 8

cluster.shd-wait-qlength: 10000

features.shard: off

user.cifs: off

network.ping-timeout: 10

storage.owner-uid: 36

storage.owner-gid: 36

re balance log:

[2017-05-23 14:45:12.637671] I [dht-rebalance.c:2866:gf_defrag_process_dir] 0-ctvvols-dht: Migration operation on dir /31e0b341-4eeb-4b71-b280-840eba7d6940/images/690c728d-a83e-4c79-ac7d-1f3f17edf7f0 took 0.00 secs

[2017-05-23 14:45:12.640043] I [MSGID: 109081] [dht-common.c:4202:dht_setxattr] 0-ctvvols-dht: fixing the layout of /31e0b341-4eeb-4b71-b280-840eba7d6940/images/091402ba-dc90-4206-848a-d73e85a1cc35

[2017-05-23 14:45:12.641516] I [dht-rebalance.c:2652:gf_defrag_process_dir] 0-ctvvols-dht: migrate data called on /31e0b341-4eeb-4b71-b280-840eba7d6940/images/091402ba-dc90-4206-848a-d73e85a1cc35

[2017-05-23 14:45:12.642421] I [dht-rebalance.c:2866:gf_defrag_process_dir] 0-ctvvols-dht: Migration operation on dir /31e0b341-4eeb-4b71-b280-840eba7d6940/images/091402ba-dc90-4206-848a-d73e85a1cc35 took 0.00 secs

[2017-05-23 14:45:12.645610] I [MSGID: 109081] [dht-common.c:4202:dht_setxattr] 0-ctvvols-dht: fixing the layout of /31e0b341-4eeb-4b71-b280-840eba7d6940/images/be1e2276-d38f-4d90-abf5-de757dd04078

[2017-05-23 14:45:12.647034] I [dht-rebalance.c:2652:gf_defrag_process_dir] 0-ctvvols-dht: migrate data called on /31e0b341-4eeb-4b71-b280-840eba7d6940/images/be1e2276-d38f-4d90-abf5-de757dd04078

[2017-05-23 14:45:12.647589] I [dht-rebalance.c:2866:gf_defrag_process_dir] 0-ctvvols-dht: Migration operation on dir /31e0b341-4eeb-4b71-b280-840eba7d6940/images/be1e2276-d38f-4d90-abf5-de757dd04078 took 0.00 secs

[2017-05-23 14:45:12.653291] I [dht-rebalance.c:3838:gf_defrag_start_crawl] 0-DHT: crawling file-system completed

[2017-05-23 14:45:12.653323] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 23

[2017-05-23 14:45:12.653508] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 24

[2017-05-23 14:45:12.653536] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 25

[2017-05-23 14:45:12.653556] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 26

[2017-05-23 14:45:12.653580] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 27

[2017-05-23 14:45:12.653603] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 28

[2017-05-23 14:45:12.653623] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 29

[2017-05-23 14:45:12.653638] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 30

[2017-05-23 14:45:12.653659] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 31

[2017-05-23 14:45:12.653677] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 32

[2017-05-23 14:45:12.653692] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 33

[2017-05-23 14:45:12.653711] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 34

[2017-05-23 14:45:12.653723] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 35

[2017-05-23 14:45:12.653739] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 36

[2017-05-23 14:45:12.653759] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 37

[2017-05-23 14:45:12.653772] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 38

[2017-05-23 14:45:12.653789] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 39

[2017-05-23 14:45:12.653800] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 40

[2017-05-23 14:45:12.653811] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 41

[2017-05-23 14:45:12.653822] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 42

[2017-05-23 14:45:12.653836] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 43

[2017-05-23 14:45:12.653870] I [dht-rebalance.c:2246:gf_defrag_task] 0-DHT: Thread wokeup. defrag->current_thread_count: 44

[2017-05-23 14:45:12.654413] I [MSGID: 109028] [dht-rebalance.c:4079:gf_defrag_status_get] 0-ctvvols-dht: Rebalance is completed. Time taken is 0.00 secs

[2017-05-23 14:45:12.654428] I [MSGID: 109028] [dht-rebalance.c:4083:gf_defrag_status_get] 0-ctvvols-dht: Files migrated: 0, size: 0, lookups: 15, failures: 0, skipped: 0

[2017-05-23 14:45:12.654552] W [glusterfsd.c:1327:cleanup_and_exit] (-->/lib64/libpthread.so.0(+0x7dc5) [0x7ff40ff88dc5] -->/usr/sbin/glusterfs(glusterfs_sigwaiter+0xe5) [0x7ff41161acd5] -->/usr/sbin/glusterfs(cleanup_and_exit+0x6b) [0x7ff41161ab4b] ) 0-: received signum (15), shutting down

Appreciate your help

--

Respectfully
Mahdi A. Mahdi

_______________________________________________
Gluster-users mailing list
Gluster-users@xxxxxxxxxxx
http://lists.gluster.org/mailman/listinfo/gluster-users

_______________________________________________
Gluster-users mailing list
Gluster-users@xxxxxxxxxxx
http://lists.gluster.org/mailman/listinfo/gluster-users