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тАО01-27-2011 10:35 AM
тАО01-27-2011 10:35 AM
Serviceguard 11.19 on 2 Itanium 11iv3 nodes - quorum
Only node 1 has a package running. Im want to add a configure a new package on second node.
With the cluster up, etc, when i run checkconf the new package, will it complain about the quorum server being down?? Will it allow me to proceed and 'apply' my package?
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тАО01-27-2011 10:45 AM
тАО01-27-2011 10:45 AM
Re: Serviceguard 11.19 on 2 Itanium 11iv3 nodes - quorum
If all else fails, why not quickly install the QS software on another server, set it up, and add the origional QS ip address using ifconfig lanx:1
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тАО01-27-2011 11:47 AM
тАО01-27-2011 11:47 AM
Re: Serviceguard 11.19 on 2 Itanium 11iv3 nodes - quorum
The only time you will have a problem is if the cluster goes 'down', then it will require the Quorum server to come backup. Or as Melvyn suggests, you could set up another device as a quorum server.
Rgrds,
Rita
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тАО01-27-2011 04:04 PM
тАО01-27-2011 04:04 PM
Re: Serviceguard 11.19 on 2 Itanium 11iv3 nodes - quorum
IF you have LVM volume groups being used by packages why dont you configure a lock disk or a locklun if you have a unused lun.
A lock disk costs nothing if you have LVM volume groups.
A 2 node cluster is risky if your quorum server is down for a long time.
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тАО01-28-2011 01:06 AM
тАО01-28-2011 01:06 AM
Re: Serviceguard 11.19 on 2 Itanium 11iv3 nodes - quorum
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тАО01-28-2011 04:37 AM
тАО01-28-2011 04:37 AM
Re: Serviceguard 11.19 on 2 Itanium 11iv3 nodes - quorum
The Quorum server is what provides arbitration when bringing a cluster up, be it as a result of first turning it on or bringing it back up after a failure. At least that is how I read the following from the QS ver 4 document page 9:
"If the Quorum Server is not available or reachable, it will not adversely affect any clusters using
it, unless a cluster needs to reform and requires the Quorum Server├в s arbitration to do so.
As of Serviceguard A.11.19, you can change from one quorum server to another, or to or from
another quorum method, while the cluster is running."
Since Tom is at version 11.19, he could make the change to a different QS, as was mentioned, and he can make changes to his running cluster. But if he goes down, then he needs QS to get back up.
Hope this helps,
Rita
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тАО01-28-2011 06:02 AM
тАО01-28-2011 06:02 AM
Re: Serviceguard 11.19 on 2 Itanium 11iv3 nodes - quorum
1. So i can shutdown (not a failure) one of the nodes and the cluster will remain up? (should!!)
2. I read the 11.19 guide but didnt see where you can change to another quorum server online??!!
3. We are looking to implement Quorum Server on a Linux host. I can halt everything and reconfigure (cmquerycl -q quorumserver....) using a new quorum name.
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тАО01-28-2011 06:07 AM
тАО01-28-2011 06:07 AM
Re: Serviceguard 11.19 on 2 Itanium 11iv3 nodes - quorum
Rgrds,
Rita
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тАО01-29-2011 05:55 AM
тАО01-29-2011 05:55 AM
Re: Serviceguard 11.19 on 2 Itanium 11iv3 nodes - quorum
"The Quorum server is what provides arbitration when bringing a cluster up, be it as a result of first turning it on or bringing it back up after a failure. At least that is how I read the following from the QS ver 4 document page 9: "
when a cluster is first started by doing a cmruncl, NO arbitration "device" (be it Cluster Lock Disk, LockLun or Quorum Server)is required.
The ONLY time an arbitration device is required is when a FAILURE is experienced, and this results in there being EXACTLY 50% left to try to re-form as a cluster.
This is a good document to refer to:
http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02056095/c02056095.pdf
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тАО01-30-2011 08:37 AM
тАО01-30-2011 08:37 AM
Re: Serviceguard 11.19 on 2 Itanium 11iv3 nodes - quorum
Hmmmm, yes the cluster lock and quorum server are the two methodologies that help in "cluster reformation" when one of the nodes fail. The cmcld always checks for 100% node attendance and if heartbeat messages are not being received within node_timeout then communication is lost between the nodes which divides the system into 2 "seperate subclusters" (in case of a 2 node cluster). And as of my knowledge this is the most momentous requirement for a "cluster lock" or a "quorum server" as it helps in "cluster reformation". Only difference being the quorum server is outside the serviceguard environment for the cluster we are concerned with. "Tie breaker" is one of the terms used when you talk about this concept but few HPUX administrators don't like that term. :)
Regards
Ismail Azad