[Pacemaker] Replacing sbd devices in running cluster

[emmanuel segura]

from one of two:

/dev/sdX and /dev/sdY

sbd -d "/dev/sdX;/dev/sdY" message node1 exit
sbd -d "/dev/sdX;/dev/sdY" message node2 exit

sbd -d /dev/sdA create && sbd -d /dev/sdB create

Now in every cluster node

sbd -d "/dev/sdA;/dev/sdB" -D -W watch


If you speficy your sbd devices in /etc/sysconfig/sbd, you don't need
to use "params sbd_device="/dev/sdX;/dev/sdY"

2015-01-29 19:00 GMT+01:00 Gregory House <raintown.us at gmail.com>:
> Hi Pacemaker Experts
>
> I have inherited a pacemaker cluster running on the SLES11SP1 stack.
> Sadly there is no support contract any more.
>
> # rpm -qa | egrep 'pacemaker'
> pacemaker-mgmt-2.0.0-0.5.5
> pacemaker-mgmt-client-2.0.0-0.5.5
> pacemaker-1.1.5-5.9.11.1
> libpacemaker3-1.1.5-5.9.11.1
> drbd-pacemaker-8.3.11-0.3.1
>
> I need to migrate both SBD devices.  I.e. /dev/sdX and /dev/sdY. to
> /dev/sdA and /dev/sdB
>
> It is required to do this without service downtime.
>
> The sbd resource is running OK:
>
> # crm_mon -1 | grep sbd
>  stonith_sbd_is (stonith:external/sbd): Started node1
>
> and is configured as follows
>
> # crm configure show | grep sbd
> primitive stonith_sbd_is stonith:external/sbd \
>         params sbd_device="/dev/sdX;/dev/sdY"
>
> and sbd processes are running from this config
>
> # cat /etc/sysconfig/sbd
> SBD_DEVICE="/dev/sdX;/dev/sdY"
> SBD_OPTS="-W"
>
> pstree -halp | grep sbd
>   |-sbd,8797
>   |   |-sbd,8798
>   |   `-sbd,8799
>
> (similarly on node2)
>
> The resources are all running, and both nodes are OK
>
> # crm_mon
> Last updated: Thu Jan 29 18:52:53 2015
> Stack: openais
> Current DC: s987l1020 - partition with quorum
> Version: 1.1.5-5bd2b9154d7d9f86d7f56fe0a74072a5a6590c60
> 2 Nodes configured, 2 expected votes
> 61 Resources configured.
> ============
>
> Online: [ node1 node2]
>
> stonith_sbd_is  (stonith:external/sbd): Started node1
> ....
>
>
> Is this change possible without stopping the cluster? If so, how
> should I best implement?
>
> With downtime I guess all I would need to do is change the
> /etc/sysconfig/sbd file, change the settings within the cluster via
> crm, and restart everything. But I cannot see the cluster surviving
> this without a downtime?
>
> Best
> GH
>
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