Forum Discussion

IdaWong's avatar
IdaWong
Level 4
12 years ago

restrict the number of vcs service group starting up at the same time during hastart

hi, is there any way to restrict the number of service groups that can be started during hastart?  the service groups all have AutoStartList and there is no group dependency except the network inte...
business continuity
Cluster Server
Tip-How to
  • Wally_Heim's avatar
    Wally_Heim
    12 years ago

    Hi IdaWong,

    There is no way to serialize the service group online without service group dependancies.  However, you can lower the NumThreads for a given resource type to minimize the number of operations done for a given resource type.  This would be handy if you have a large number of a single resource.

    In your case, I would recommend increasing the OnlineRetryLimit for the resource that is having problems.  This will tell VCS to attempt to online the resource a given number of times if it is not online after the online entry point completes.  It might take some playing to get a value that works for you.  I would start with either a value of 2 or 3 and see how that does.  The default is 0.

     

    Thank you,

    Wally

mikebounds's avatar
mikebounds
Level 6
12 years ago

You don't need to retrict the number of service groups starting at the same time, because most resources, like diskgroups, mounts and IPs can cope with been started in parallel, but it sounds like your application cannot.

So you can use NumThreads (as Wally says) for resource type for your application, so if for instance your application is using "Application" resource type and you want no more than 2 applications starting at the same time on the same system use:

hatype -modify Application NumThreads=2

An alternative is to modify the OnlineTimeout so that if multiple applications start at the same time and they take longer as they are starting together, then you allow for, but I think you may have to increase OnlineTimeout even if you use NumThreads, as I think if VCS tries to online a resource, and there isn't a thread available, then the time waiting for a thread eats into the OnlineTimeout.

As Marianne, says you can use the Preonline trigger so the logic is:

loop
  If other applications service groups are onlining (they are in PARTIAL, ONLINING state), then wait 10 seconds
continue looping
Now online service group (execute hagrp -nopre -online)

Mike