What is the version of HAD and is it a global cluster or local cluster?
It's likely you need to have a look at WAC rather than LLT/GAB
2 fffffffff79bb000 5fd08 264 1 vxdmp (VxVM 6.0.500.300 Multipathing D) 97 fffffffff7dc5000 396b58 265 1 vxio (VxVM 6.0.500.300 I/O driver) 98 fffffffff812d000 c750 268 1 fdd (VxQIO 6.0.500.100 Quick I/O dri) 99 fffffffff813a000 26e2a8 21 1 vxfs (VxFS 6.0.500.100 SunOS 5.10)
Its alocal cluster
The logs you have pasted point to VxVM multipathing and not Cluster ..
Do you mean you have VxVM issues ? Did you check storage logs if there are network blips on the storage paths ?