[Linux-cluster] multipathed quorum disk

[Darrin De Groot <d degroot griffith edu au>]

Hi,

I am running a 4 node cluster with a
multipathed quorum disk, configured to use the path /dev/dm-1. The problem
that I am having is that if I lose one path to the disk (am testing by
pulling one fibre), the node is almost always fenced (one node, once, managed
to stay up, out of more than 10 attempts). Is there some timeout that needs
changing to give qdiskd the time to realise that a path is down? I have
tried an interval of 3 seconds with at TKO of 10, with no success, and
a token timeout set at 45000ms:

<totem consensus="4800"
join="60" token="45000" token_retransmits_before_loss_const="20"/>
        <quorumd
device="/dev/dm-1" interval="3" min_score="1"
tko="10" votes="3"/>

output of mkqdisk -L:

[root host3 ~]# mkqdisk -L
mkqdisk v0.5.1
/dev/sdc1:
        Magic:
  eb7a62c2
        Label:
  cms_qdisk
        Created:
Mon May 26 14:24:29 2008
        Host:
   host3

/dev/sdd1:
        Magic:
  eb7a62c2
        Label:
  cms_qdisk
        Created:
Mon May 26 14:24:29 2008
        Host:
   host3

/dev/dm-1:
        Magic:
  eb7a62c2
        Label:
  cms_qdisk
        Created:
Mon May 26 14:24:29 2008
        Host:
   host3

When the node subsequently boots, with
only one path, everything works just fine, so it can obviously use both
paths.

Is anyone able to offer any advice on
why this is happening (and how to stop it)?

Regards,

Darrin.