I am trying to get qdisk going in a 2-node RHCS 4.4 cluster with EMC
PowerPath
I was able to format the device:
mkqdisk -c /dev/emcpowera1 -l quorum_disk_1
this command shows multiple copies (4 paths, native devices, and one EMC
pseudo device)
[jabbah:~]# mkqdisk -L
mkqdisk v0.5
/dev/sdc1:
Magic: eb7a62c2
Label: quorum_disk_1
Created: Mon Oct 30 16:15:57 2006
Host: sargas.telkomsa.net
/dev/sdd1:
Magic: eb7a62c2
Label: quorum_disk_1
Created: Mon Oct 30 16:15:57 2006
Host: sargas.telkomsa.net
/dev/sdg1:
Magic: eb7a62c2
Label: quorum_disk_1
Created: Mon Oct 30 16:15:57 2006
Host: sargas.telkomsa.net
/dev/sdh1:
Magic: eb7a62c2
Label: quorum_disk_1
Created: Mon Oct 30 16:15:57 2006
Host: sargas.telkomsa.net
/dev/emcpowera1:
Magic: eb7a62c2
Label: quorum_disk_1
Created: Mon Oct 30 16:15:57 2006
Host: sargas.telkomsa.net
Here is my stanza from cluster.conf
<quorumd interval="1" tko="10" votes="2" device="/dev/emcpowera1"
label="quorum_disk_1">
<heuristic program="ping 192.168.222.254 -c1 -t1" score="2" interval="2"/>
</quorumd>
I tell it to use /dev/emcpowera1 but it insists on using the first path,
/dev/sdc1
[jabbah:~]# cat /proc/cluster/nodes
Node Votes Exp Sts Name
0 2 0 M /dev/sdc1
1 1 2 M jabbah
2 1 2 M sargas
Is there any way to blacklist /dev/sd* devices from being scanned
(similar to what is done for LVM)? or force qdisk to use /dev/emcpowera1?
using the native device is bad for obvious reasons (if you lose the
path, you lose the node or even the whole quorum disk, depending on
where the path failure is)
qdisk seems somewhat unreliable with my setup, with intermittent
messages like this:
Oct 31 10:22:57 sargas qdiskd[18712]: <crit> Critical Error: More than
one master found!
Oct 31 10:22:58 sargas qdiskd[11964]: <crit> A master exists, but it's
not me?!
Also, "mkqdisk -f" does not "Find the cluster quorum disk with the given
label" but instead just displays the version number
[jabbah:~]# mkqdisk -f quorum_disk_1
mkqdisk v0.5
is this a bug? I logged it as
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=213218
greetings
Riaan
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