robert chien wrote:
>I would like to know if it's possible to build a VCS with a single node,
>then add a second node later? What is involved in planning such project?

Robert,

is is possible but not very useful w/o a second node (obviously).
We have a single-node 'cluster' for testing and it is just fine. For planning
with VCS, you probably want to go to class, that's the best advice possible.
In general, you need something for heartbeats (disk, nic, etc.) and
to sketh out your resource, resource groups, etc. Like I said, go to class


cheers,

Greg Gallagher
First Optinos Chicago
UNIX Adminsitrator

I do it before I teach VCS on the instructor's system so
I can demonstrate the GUI and other features. It is handy for
testing.

Setup as normal. Only put one system in the main.cf.

To get the LLT and GAB working, hook a spare hub to it and have
it GAB away to nobody.

Later you can add another system, see hasys command.


robert chien wrote:
>Hi,
>
>I would like to know if it's possible to build a VCS with a single node,
>then add a second node later? What is involved in planning such project?
>Thanks!
>
>Cheers,
>Robert

One good way of running VCS in single node mode is to
modify the /etc/rc3.d/S99vcs script so that the hastart
command runs with the -onenode flag. The -onenode flag
starts a daemon called gabsim which replaces the LLT and GAB
layers which ordinarily would require a NIC to bind to.

The only thing to remember is that gabsim needs to be killed
and the vcs start scripts reverted if you intend to later add nodes
as the gabsim daemon can get in the way of some cluster reconfig
actions, especially those involving node ID changes and LLT changes.

Devon Ayres
Kanatek Technologies







"Gene Henriksen" wrote:
>
>I do it before I teach VCS on the instructor's system so
>I can demonstrate the GUI and other features. It is handy for
>testing.
>
>Setup as normal. Only put one system in the main.cf.
>
>To get the LLT and GAB working, hook a spare hub to it and have
>it GAB away to nobody.
>
>Later you can add another system, see hasys command.
>
>
>robert chien wrote:
>>Hi,
>>
>>I would like to know if it's possible to build a VCS with a single node,
>>then add a second node later? What is involved in planning such project?
>>Thanks!
>>
>>Cheers,
>>Robert
>