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List:       veritas-ha
Subject:    Re: [Veritas-ha] Service group dependency.
From:       "James T. Wonder" <wonder () aip ! org>
Date:       2004-04-05 13:11:55
Message-ID: 40715B1B.5010608 () aip ! org
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John,

    I am new to the cluster filesystem and did not know that this was 
advisable.  After looking at it a bit, it seemed as if the CVM and CFS 
needed to be seperate service groups, but I guess in my configuration 
where all the systems mount the same disks anyway it would make sense.

    This is the easy way to do it, but I think I would still like to see 
a "Service Group Proxy" agent available.  If I get time I will write it. 
  Unless anyone thinks it is bad I am joining the two SG's together.

						James



John Muth wrote:
> Hi James,
> 
> I agree with Duncan. If it were me, I'd merge the separate CVM and 
> CFS SG's before I'd think about writing a custom agent. 
> 
> -John Muth
> 
> 
>>From: Duncan Bradey <duncan.bradey@veritas.com>
>>To: "'James T. Wonder'" <wonder@aip.org>, 
>>veritas-ha@mailman.eng.auburn.edu
>>Subject: RE: [Veritas-ha] Service group dependency.
>>Date: Fri, 2 Apr 2004 14:33:25 +1000 
>>
>>Putting the CFS SG resources in the CVM SG, and setting up resource
>>dependencies?
>>
>>
>>
>>-----Original Message-----
>>From: James T. Wonder [mailto:wonder@aip.org] 
>>Sent: Friday, 2 April 2004 2:04 PM
>>To: veritas-ha@mailman.eng.auburn.edu; wonder@aip.org
>>Subject: [Veritas-ha] Service group dependency.
>>
>>
>>Hello,
>>
>>    I have what I feel is an interesting problem and thought I would 
>>share it with the list.  I am running BEA and I have an interesting 
>>service group dependency issue.  I have two application servers with 
>>managed servers on each using a clustered environment setup 
>>by BEA.  I 
>>am running SANpoint foundation suite HA on both systems 
>>sharing the data 
>>directories.
>>
>>1) The BEA administration server can only run on one server at a time.
>>
>>2) Both servers need to have the administration server 
>>running in order 
>>to start the managed servers.
>>
>>3) I already have the maximum level of SG dependencies with 
>>the CVM and 
>>CFS groups.
>>
>>
>>My setup is as follows:
>>
>>CVM SG - The Cluster volume manager service group.
>>	Parallel service group.
>>
>>CFS SG - The cluster file system and mount service group.
>>	Parallel service group.
>>
>>APP1 SG - The first application server SG with managed servers.
>>	Runs on server "app1" only.
>>
>>APP2 SG - The second application server SG with managed servers.
>>	Runs on server "app2" only.
>>
>>AdminServer SG - The administration server SG that starts the
>>	administration server on either app server and fails it
>>	over on machine down or failure event.
>>	Runs on servers "app1" and "app2".
>>
>>
>>My group dependencies are now:
>>
>>CVM  -> CFS  ->  APP1
>>              ->  APP2
>>
>>Because APP1 and APP2 both require the disks that are started 
>>in CVM and 
>>CFS.
>>
>>SG hierarchy levels have been reached, I cannot create any 
>>more levels.
>>
>>
>>Problem:
>>
>>How to make the starting of APP1 and APP2 SG's dependant on the 
>>AdminServer SG without using a SG dependency.  I tried the 
>>proxy agent, 
>>and if the group is not a parallel group you need to specify 
>>the target 
>>machine, which I cannot because it will go back and forth.
>>
>>
>>My possible solution:
>>
>>Please tell me what you think.  My current thought is to 
>>create an agent 
>>that checks to make sure the AdminServer SG is online on either node. 
>>If it is it comes back as online.  I wouldn't care which node 
>>it is on, 
>>just so it is on.  I would set the tolerance limit of the 
>>agent to 1 or 
>>2 to ensure that the admin server could failover without bringing the 
>>agent offline.  I may even mark the agent non-critical because it is 
>>needed to start and stop the managed servers instead of day to day 
>>activities.
>>
>>Can anyone think of any other solutions?
>>
>>					James
>>
>>
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