[Gluster-users] Out of space, rebalance and possibly split-brain issues

Lysa Milch Lysa.Milch at blackboard.com
Mon Mar 17 19:04:51 UTC 2014


Great.   Given this information, is it safe/recommended to run the rebalance on the second peer while the first one is still going?

From: Kaushal M <kshlmster at gmail.com<mailto:kshlmster at gmail.com>>
Date: Tue, 18 Mar 2014 00:05:52 +0530
To: Chris Dixon <lysa.milch at blackboard.com<mailto:lysa.milch at blackboard.com>>
Cc: "gluster-users at gluster.org<mailto:gluster-users at gluster.org>" <gluster-users at gluster.org<mailto:gluster-users at gluster.org>>
Subject: Re: [Gluster-users] Out of space, rebalance and possibly split-brain issues

Rebalance in gluster-3.2 isn't distributed. The rebalance process is
started only on the peer where the rebalance start command was run.
This is unlike, gluster-3.3 and above where rebalance is distributed
and a rebalance process is started on all peers having bricks of a
volume.

~kaushal

On Mon, Mar 17, 2014 at 11:58 PM, Lysa Milch <Lysa.Milch at blackboard.com<mailto:Lysa.Milch at blackboard.com>> wrote:
All,

This morning I noticed that although my gluster vol was only at 60%, two
individual bricks ( one on each replication server) were at 100%.  I ran a
re-balance on the first server, and am seeing ( what I hope to be ) good
progress.

/dev/xvdc                                          1.0T  399G  626G  39%
/brick1
/dev/xvdf                                          1.0T  398G  627G  39%
/brick3
/dev/xvdg                                          1.0T  299G  726G  30%
/brick5

brick5 was initially at 100%, so this is all well.

My question is, the 100% brick on my second gluster server is still at 100%
and if I run a:

volume rebalance myvol status

On the second box, no rebalance is running.

1)  Is this normal, or do I have another problem I am not aware of?
2)  Should I start a rebalance on the second box while the first is running,
or should I wait?

Thank you for any information you can share.
gluster --version
glusterfs 3.2.5 built on Jan 31 2012 07:39:59


gluster peer  status
Number of Peers: 1

Hostname: myhost.domain.com
Uuid: 00000000-0000-0000-0000-000000000000
State: Establishing Connection (Connected)


gluster volume info

Volume Name: myvol
Type: Distributed-Replicate
Status: Started
Number of Bricks: 3 x 2 = 6
Transport-type: tcp
Bricks:
Brick1: host1.domain.com:/brick1
Brick2: host2.domain.com:/brick2
Brick3: host1.domain.com:/brick3
Brick2: host2.domain.com:/brick4
Brick1: host1.domain.com:/brick5
Brick2: host2.domain.com:/brick6


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