[Gluster-users] Distributed re-balance issue

Wed May 24 17:24:27 UTC 2017

Well yes and no, when i start the re-balance and check it's status, it just tells me it completed the re-balance, but it really did not move any data and the volume is not evenly distributed.

right now brick6 is full, brick 5 is going to be full in few hours or so.

--

Respectfully
Mahdi A. Mahdi

________________________________
From: Nithya Balachandran <nbalacha at redhat.com>
Sent: Wednesday, May 24, 2017 8:16:53 PM
To: Mahdi Adnan
Cc: Mohammed Rafi K C; gluster-users at gluster.org
Subject: Re: [Gluster-users] Distributed re-balance issue

On 24 May 2017 at 22:45, Nithya Balachandran <nbalacha at redhat.com<mailto:nbalacha at redhat.com>> wrote:

On 24 May 2017 at 21:55, Mahdi Adnan <mahdi.adnan at outlook.com<mailto:mahdi.adnan at outlook.com>> wrote:

Hi,

Thank you for your response.

I have around 15 files, each is 2TB qcow.

One brick reached 96% so i removed it with "brick remove" and waited until it goes for around 40% and stopped the removal process with brick remove stop.

The issue is brick1 drain it's data to brick6 only, and when brick6 reached around 90% i did the same thing as before and it drained the data to brick1 only.

now brick6 reached 99% and i have only a few gigabytes left which will fill in the next half hour or so.

attached are the logs for all 6 bricks.

Hi,

Just to clarify, did you run a rebalance (gluster volume rebalance <vol> start) or did you only run remove-brick  ?

On re-reading your original email, I see you did run a rebalance. Did it complete? Also which bricks are full at the moment?

--

Respectfully
Mahdi A. Mahdi

________________________________
From: Nithya Balachandran <nbalacha at redhat.com<mailto:nbalacha at redhat.com>>
Sent: Wednesday, May 24, 2017 6:45:10 PM
To: Mohammed Rafi K C
Cc: Mahdi Adnan; gluster-users at gluster.org<mailto:gluster-users at gluster.org>
Subject: Re: [Gluster-users] Distributed re-balance issue

On 24 May 2017 at 20:02, Mohammed Rafi K C <rkavunga at redhat.com<mailto:rkavunga at redhat.com>> wrote:

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.

That is correct. As Rafi said, the layout matters here. Can you please send across all the rebalance logs from all the 6 nodes?

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

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