Re: libgfapi failover problem on replica bricks

[Fabio Rosati <fabio.rosati@xxxxxxxxxxxxxxxxx>]

Hi Joe,

since I only use GlusterFS in production, I cannot reboot my servers whenever I want (mainly due to this "VM freeze" issue). I'll try it next time I have to reboot them, probably in the next two weeks.

Thank you

Fabio Rosati

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Da: "Joe Julian" <joe@xxxxxxxxxxxxxxxx>
A: "Fabio Rosati" <fabio.rosati@xxxxxxxxxxxxxxxxx>, "Paul Penev" <ppquant@xxxxxxxxx>
Cc: Gluster-users@xxxxxxxxxxx
Inviato: Mercoledì, 9 aprile 2014 16:24:53
Oggetto: Re: [Gluster-users] libgfapi failover problem on replica bricks

I've asked before and not had any luck getting someone to try this:

On the server you're about to reboot, "killall glusterfsd" and let me know if you still see the same problem at the client.

On April 9, 2014 1:19:43 AM PDT, Fabio Rosati <fabio.rosati@xxxxxxxxxxxxxxxxx> wrote:

Hi Paul,

you're not alone. I get the same issue after rebooting a brick belonging to a 2 x 2 volume and the same is true for João P. and Nick M. (added in cc).

[root@networker ~]# gluster volume info gv_pri
 
Volume Name: gv_pri
Type: Distributed-Replicate
Volume ID: 3d91b91e-4d72-484f-8655-e5ed8d38bb28
Status: Started
Number of Bricks: 2 x 2 = 4
Transport-type: tcp
Bricks:
Brick1: nw1glus.gem.local:/glustexp/pri1/brick
Brick2: nw2glus.gem.local:/glustexp/pri1/brick
Brick3: nw3glus.gem.local:/glustexp/pri2/brick
Brick4: nw4glus.gem.local:/glustexp/pri2/brick
Options Reconfigured:
storage.owner-gid: 107
storage.owner-uid: 107
server.allow-insecure: on
network.remote-dio: on
performance.write-behind-window-size: 16MB
performance.cache-size: 128MB

I hope someone will address this problem in the near future since not being able to
shutdown a server hosting a brick is a big limitation.
It seems someone solved the problem using cgroups: http://www.gluster.org/author/andrew-lau/
Anyway, I think it's not easy to implement because cgroups is already configured and in use for libvirt, if I had a test environment and some spare time I would have tried.

Regards,
Fabio Rosati 

----- Messaggio originale -----
Da: "Paul Penev" <ppquant@xxxxxxxxx>
A: Gluster-users@xxxxxxxxxxx
Inviato: Domenica, 6 aprile 2014 17:52:53
Oggetto:  libgfapi failover problem on replica bricks

Hello,

I'm having an issue with rebooting bricks holding images for live KVM
machines (using libgfapi).

I have a replicated+distributed setup of 4 bricks (2x2). The cluster
contains images for a couple of kvm virtual machines.

My problem is that when I reboot
a brick containing a an image of a
VM, the VM will start throwing disk errors and eventually die.

The gluster volume is made like this:

# gluster vol info pool

Volume Name: pool
Type: Distributed-Replicate
Volume ID: xxxxxxxxxxxxxxxxxxxx
Status: Started
Number of Bricks: 2 x 2 = 4
Transport-type: tcp
Bricks:
Brick1: srv10g:/data/gluster/brick
Brick2: srv11g:/data/gluster/brick
Brick3: srv12g:/data/gluster/brick
Brick4: srv13g:/data/gluster/brick
Options Reconfigured:
network.ping-timeout: 10
cluster.server-quorum-type: server
diagnostics.client-log-level: WARNING
auth.allow: 192.168.0.*,127.*
nfs.disable: on

The KVM instances run on the same gluster bricks, with disks mounted
as : file=gluster://localhost/pool/images/vm-xxx-disk-1.raw,.......,cache=writethrough,aio=native

My self-heal backlog is not always 0. It looks like some writes
are
not going to all bricks at the same time (?).

gluster vol heal pool info

sometime shows the images needing sync on one brick, the other or both.

There are no network problems or errors on the wire.

Any ideas what could be causing this ?

Thanks.

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