Although this is a very old thread, for posterity please note that there is now a generic way to keep up with both current and new ASLs at:
http://vos.symantec.com/asl
You can filter on
Vendor=Sun
Platform=Solaris SPARC, Solaris x64 (since you mention MPXIO)
SFHA version=5.0,5.0MP1,etc.
and you get a table showing the StorageTek 6540 ASLs, specifically they are available for VxVM 5.0MP3 on both SPARC and x64.
from there, you can get the details on the ASL
https://vos.symantec.com/asl/details/429/127
which hints at the release date, plus lets you download it (as well as the associated APM).