Re: File Corruption with shards - 100% reproducable

[Krutika Dhananjay <kdhananj@xxxxxxxxxx>]

Sorry, that was a typo. :( It is supposed to be moved into /var/lib/glusterd/groups/virt.

I am suspecting stat-prefetch to be the culprit.

So to start with, just disable performance.stat-prefetch and leave the rest of the options as they were before and run the test case.

Thank you very much for your help. :)

-Krutika

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From: "Lindsay Mathieson" <lindsay.mathieson@xxxxxxxxx>
To: "Krutika Dhananjay" <kdhananj@xxxxxxxxxx>
Cc: "gluster-users" <gluster-users@xxxxxxxxxxx>
Sent: Saturday, November 14, 2015 4:56:39 PM
Subject: Re: File Corruption with shards - 100% reproducable

On 14 November 2015 at 17:30, Krutika Dhananjay <kdhananj@xxxxxxxxxx> wrote:

You should be able to find a file named group-virt.example under /etc/glusterfs/

Copy that as /var/lib/glusterd/virt.

Doesn't seem to exist in the debian jessie apt repo, but I copied it from here:

  https://raw.githubusercontent.com/gluster/glusterfs/master/extras/group-virt.example

And I think it needed to go here:

  /var/lib/glusterd/virt/group

However the good news is, I applied it and seems to have made the difference. Freely migrating my test VM now with no corruption. Will stress test it a bit more.

current settings are now:
gluster volume info

Volume Name: datastore1
Type: Replicate
Volume ID: 238fddd0-a88c-4edb-8ac5-ef87c58682bf
Status: Started
Number of Bricks: 1 x 3 = 3
Transport-type: tcp
Bricks:
Brick1: vnb.proxmox.softlog:/mnt/ext4
Brick2: vng.proxmox.softlog:/mnt/ext4
Brick3: vna.proxmox.softlog:/mnt/ext4
Options Reconfigured:
cluster.server-quorum-type: server
network.remote-dio: enable
cluster.eager-lock: enable
performance.stat-prefetch: off
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off
cluster.quorum-type: auto
performance.readdir-ahead: off
features.shard: on
features.shard-block-size: 128MB
performance.strict-write-ordering: on

Thanks for all the help. If you like I can start unsetting setting until we discover which one does the trick.

--

Lindsay

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