Hello,
We have more than 200 Solaris 10 with OCS Unix agent 2.1.1 with a custom CPU.pm (you can find it here, if you want).
I'm not the system admin in charge of the solaris (I'm the project manager of OCS) , but I'm sure we don't have problems with files system usage details (on both x86 or Sparc architecture) :
For the software inventory, we deploy some custom scripts with OCS to have a complete software inventory.
Regards,
Bexounet.