behaviour of SG cluster when two contradictory command are launched

[Jdamian]

Hi

How do SG cluster behave when two contradictory commands are executed ?

For instance, when the package A is been stopped, and a cmrunpkg is launched to start that package A.
Is it executed immediately or is it scheduled for execution after package stop?

Thanx in advance

[Steven E. Protter]

Shalom,

It is supposed to execute immediately.

You should run cmviewcl -v to see if the stop has changed the package state and an additional step is required to get it to start again.

SEP

[Sundar_7]

Oscar,

Unlike Veritas Cluster Server, the cm commands that effect the status of the package/cluster do not have any "current-status" check built in.

cmrunpkg will start immediately, but remember only one LVM command can run at any given point of time.Running cmrunpkg and cmhaltpkg at the same time may very well run in to LVM lock contention issues. I would be really surprised if one of them doesn't fail to complete

Sundar.

[Carsten Krege]

The commands are serialized. A cmhaltpkg would cause the package status being changed to "halting" and during this time a cmrunpkg would have to wait. A cmrunpkg changes the package status to "starting" and during this time a cmhaltpkg has to wait.

Carsten

[Geoff Wild]

It would be almost impossible to run two contradictory commands at exactly the same time in a cluster - you mean someone run a command on one node and someone else on another?

Which ever one was run first - would win - the other one would fail.

Rgds...Geoff

[Rasheed Tamton]

My sense agrees with Geoff. Unless you can verify it on a test env firing the commands and see what happens.
Anyway good question.

Rgds.