Device group and applications affinity

Hello all.
I have some device groups created with CFS configured on them.
I need to ensure that a clusterized application runs on the server that is primary for the device group. I need to set an affinity between the affinity and the device group/file system.
The problem is that the SUNW.HAStoragePlus does not indicates the real primary for the device group, for example:
# cldg status ufs_homedg
Cluster Device Groups ===
--- Device Group Status ---
Device Group Name Primary Secondary Status
ufs_homedg billbd2 billbd1 Online
# clrg status ufsg-home-rg
Cluster Resource Groups ===
Group Name Node Name Suspended Status
ufsg-home-rg billbd1 No Online
billbd2 No Offline
In this output, the resource group is online in billbd1 and the device group primary is billbd2.
If I failover the resource group, the device group is switched also, but it seems that at startup, the resource group does not check who is the primary to start on that node.
This means that the status of the resource group does not helps to identify who is the primary for a device group and I cannot use it for affinity configuration.
¿How can I ensure that an cluster application starts on the node who is primary for the device group on which the file system is created?
I was thinking on a SUNW.gds for this purpose, but I wonder if there is another way.
Thanks in advance.
Edited by: Ivan.Ferreira on Jun 19, 2008 8:04 AM

Hi Tim, thanks for your time.
Yes, I'm using AffinityOn=TRUE. After some testings, I can see that the device group is switched at startup, but I don't know under which circunstances it does not.
Also, I can force discrepancy with the device group and the resource group if a perform a cldg switch.
So, if I run clrg switch, the device group is switched also. If I run cldg switch, the device group is switched but the HAStoragePlus resource does not.
This means that HAStoragePlus cannot ensure that the node is the primary for a device group and cannot be used for affinity on applications.
�What do you think?

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