We seem to have a fundamental incompatibility between the TSA MP samadapter and OCFS2, due to both of them needing to use the Linux Watchdog timer,
Has anyone else experienced problems in this area?
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4 replies Latest Post - 2012-09-26T11:46:06Z by SteveIves
Pinned topic Unable to run TSA Multiplatforms and OCFS2 on the same node?
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Updated on 2012-09-26T11:46:06Z at 2012-09-26T11:46:06Z by SteveIves
Re: Unable to run TSA Multiplatforms and OCFS2 on the same node?2012-09-18T14:26:22Z in response to SteveIvesApparently the conflict is between the RSCT Watchdog, which is used when the samadapter is automated, to monitor the IBM.ServiceIP resources, and the OCFS2 SBD Watchdog. It would appear that the two cannot co-exist.
Enrico_Joedecke 0100003SD5103 PostsACCEPTED ANSWER
Re: Unable to run TSA Multiplatforms and OCFS2 on the same node?2012-09-18T16:26:09Z in response to SteveIvesHello Steve,
the cluster infrastructure (RSCT) uses the watchdog provided with the SuSE Linux, there is no 'own' RSCT watchdog. This watchdog however can only be used by one entity, but it is already used by OCFS2. When RSCT tries to enable it, it detects it already in use. An attempt to un-load the watchdog fails, and so RSCT can't use it, and finally is stuck.
The watchdog is used for 'critical resource protection'. A critical resource is any resource that must never run on more than one node at any time, e.g. an IP address. The samadapter resource is also defined as 'critical', the information is specified within the resource attribute 'ProtectionMode', which is 1 for critical resources, and 0 for non-critical resources.
Re: Unable to run TSA Multiplatforms and OCFS2 on the same node?2012-09-18T19:07:24Z in response to Enrico_JoedeckeThanks Enrico,
So the only options we hare are:
Disable samadapter automation on these machines, exposing us to a failure of the node the samadapter is running on, whereby we'd have to manually restart the samadapter on another node
Create a pair of machines for each TSA MP domain on which the samadapter is automated, which don't have any OCFS2 filesystems attached.
Re: Unable to run TSA Multiplatforms and OCFS2 on the same node?2012-09-26T11:46:06Z in response to SteveIvesProblem solved:
Make the samadapter and samadapter-ip non-critical:
sudo chrsrc -s "Name like 'samadapter' & ResourceType=1" IBM.Application ProtectionMode=0
sudo chrsrc -s "Name like 'samadapter-ip' & ResourceType=1" IBM.ServiceIP ProtectionMode=0
Not ideal, but all that we can apparently do in this situation.