Re: File Corruption with shards - 100% reproducable

[Krutika Dhananjay <kdhananj@xxxxxxxxxx>]

The logs are at /var/log/glusterfs/<hyphenated-path-to-the-mountpoint>.log

OK. So what do you observe when you set group virt to on?

# gluster volume set <VOL> group virt

-Krutika

---

From: "Lindsay Mathieson" <lindsay.mathieson@xxxxxxxxx>
To: "Krutika Dhananjay" <kdhananj@xxxxxxxxxx>
Cc: "gluster-users" <gluster-users@xxxxxxxxxxx>
Sent: Friday, November 13, 2015 11:57:15 AM
Subject: Re: File Corruption with shards - 100% reproducable

On 12 November 2015 at 15:46, Krutika Dhananjay <kdhananj@xxxxxxxxxx> wrote:

OK. What do the client logs say?

Dumb question - Which logs are those? 

Could you share the exact steps to recreate this, and I will try it locally on my setup?

I'm running this on a 3 node proxmox cluster, which makes the vm creation & migration easy to test.

Steps:

- Create 3 node gluster datastore using proxmox vm host nodes

- Add gluster datastore as a storage dvice to proxmox

  * qemu vms use the gfapi to access the datastore

  * proxmox also adds a fuse mount for easy acces

- create a VM on the gluster storage, QCOW2 format. I just created a simple debain Mate vm

- start the vm, open a console to it.

- live migrate the VM to a another node

- It will rapdily barf itself with disk errors

- stop the VM

- qemu will show file corruption (many many errors)

  * qemu-img check <vm disk image>
  * qemu-img info <vm disk image>

Repeating the process with sharding off has no errors.

 

Also, want to see the output of 'gluster volume info'.

I've trimmed settings down to a bare minimum. This is a test gluster cluster so I can do with it as I wish.

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:
performance.strict-write-ordering: on
performance.readdir-ahead: off
cluster.quorum-type: auto
features.shard: on

--

Lindsay

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