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LDOMs VCS support on T5220

807567Apr 1 2008 — edited Jun 9 2008
I'm trying to determine what the limitations with VCS are with the Sun T5220. I have four applications, each configured in two-node clusters and I want to virtualize them onto two T5220s. Looking at the Veritas document, all it says is that you need to install VCS in the control domain (p39).

http://ftp.support.veritas.com/pub/support/products/Foundation_Suite/293324.pdf

My question is this: With VCS installed in the control domain, will that allow you to run multiple clustered applications within guest domains, or do clustered applications need to be installed within the control domain?

Thanks...

Comments

807567
I've been playing with VCS and LDOMs the last couple of weeks, and from what I know so far, VCS can only be installed at the Control Domain level and only used to fail LDOMs between servers. We're currently testing Oracle 10g in LDOMs with clustering at the LDOM level.
807567
Thanks for the information. How have your tests been when failing LDOMs between servers? How much downtime is incurred?

We have a lot of physical servers using VCS and want to virtualize them. I'm thinking that this approach is the method that would be needed to maintain a similar high availability configuration.

Thanks...
807567
Right now it takes less than a minute to move a LDOM from one server to another. Currently Oracle isn't started. Once the DBAs get some instances loaded, we'll see how long it takes to fail over and what it does to the databases. From what I've heard from Veritas, VCS has no control over Oracle in a LDOM, so I'm not sure if I'm going to get a clean shutdown when I do fail overs.
807567
One nuisance I've found, if the LDOM crashes, VCS doesn't allow the LDOM enough time to do a core dump before it faults the resource. I know now if I force a panic, I need to freeze the service group. But if the LDOM panics on its own, I won't get a core dump because VCS will fault the LDOM resource.
807567
1. There is an updated application note which explains support/visibility for monitoring applications that run inside LDom. The link to the note is http://library.veritas.com/docs/293324.

2. VCS allows to wait before faulting LDom resource by means of tuning resource and type level attributes. If user wants to wait for core dump to finish, ToleranceLimit attribute of resource type LDom can be set in such a way that VCS will wait before faulting the resource. The formula to set the attribute is:
ceiling(time-in-sec-to-dump-core/MonitorInterval)
This will make VCS wait for time-in-sec-to-dump-core after VCS detects problem with LDom.
807567
Rather than run VCS within the Control Domain, is there a way to run VCS (with CFS) for IO domains and their applications? We have some apps that use VCS on physical machines, and want to migrate them to LDOMs with the same functionality.
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Locked on Jul 7 2008
Added on Apr 1 2008
#oracle-virtualization, #oracle-vm-server-for-sparc
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