[Gluster-users] Rebalance + VM corruption - current status and request for feedback

[Mahdi Adnan]

Good morning,


So i have tested the new Gluster 3.10.2, and after starting rebalance two VMs were paused due to storage error and third one was not responding.

After rebalance completed i started the VMs and it did not boot, and throw an XFS wrong inode error into the screen.


My setup:

4 nodes running CentOS7.3 with Gluster 3.10.2

4 bricks in distributed replica with group set to virt.

I added the volume to ovirt and created three VMs, i ran a loop to create 5GB file inside the VMs.

Added new 4 bricks to the existing nodes.

Started rebalane "with force to bypass the warning message"

VMs started to fail after rebalancing.



--

Respectfully
Mahdi A. Mahdi

________________________________
From: Krutika Dhananjay <kdhananj at redhat.com>
Sent: Wednesday, May 17, 2017 6:59:20 AM
To: gluster-user
Cc: Gandalf Corvotempesta; Lindsay Mathieson; Kevin Lemonnier; Mahdi Adnan
Subject: Rebalance + VM corruption - current status and request for feedback

Hi,

In the past couple of weeks, we've sent the following fixes concerning VM corruption upon doing rebalance - https://review.gluster.org/#/q/status:merged+project:glusterfs+branch:master+topic:bug-1440051

These fixes are very much part of the latest 3.10.2 release.

Satheesaran within Red Hat also verified that they work and he's not seeing corruption issues anymore.

I'd like to hear feedback from the users themselves on these fixes (on your test environments to begin with) before even changing the status of the bug to CLOSED.

Although 3.10.2 has a patch that prevents rebalance sub-commands from being executed on sharded volumes, you can override the check by using the 'force' option.

For example,

# gluster volume rebalance myvol start force

Very much looking forward to hearing from you all.

Thanks,
Krutika
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