Storage Foundation 3.2.542.0 error message

No errors from HBA driver or vxio errors in System log?

You are not really giving us much to work with...

The Yellow exclamation is a warning - normaly seen as a result of connectivity or I/O issue. I would expect some sort of evidence in Event Viewer logs.

Extract from 5.1 admin guide:
Warning. The yellow caution symbol indicates there is a potential problem but the system can still function normally.

This is in line with what you are seeing - all data seem to be accessible.

What seems weird is the fact that FIVE different harddisks are all showing internal name as disk1.

If you can afford downtime on your cluster, please offline the cluster group, then try to manually deport and import diskgroup. See if that makes a difference.

I am a bit hesitant to suggest too many 'remedial' actions because you are out of support...