Error Message

fbt: WARNING: couldn't allocate FBT table for module vxio
 

As per the Storage Foundation 5.0 Release Notes for Solaris (page 64):

Solaris Issues

Dynamic Tracing Function Boundary Tracing probes

Dynamic Tracing (Dtrace) Function Boundary Tracing (FBT) probes are not supported with the vxio driver. This is because of a limitation in Solaris 10 that such probes cannot handle modules with a text size larger than 2MB. The following error message is generated on the console as a result of using Dtrace FBT probes with the vxio driver:

fbt: Warning: couldn't allocate FBT table for module vxio

Function Boundary Tracing (FBT) probes are supported when using Storage Foundation 5.1 and 5.1SP1 as the vxio module has been rewritten to have a smaller text size in these versions.  

Please notes FBT probes are not supported on SF 6.0 and above because the kernel modules are bigger than 2MB.