Bug ID 6769808: If a service domain running up to the Solaris 10 5/08 OS is exporting a ZFS volume as a single-slice disk to a guest domain running the Solaris 10 10/08 OS, then this guest domain is unable to use that virtual disk. Any access to the virtual disk fails with an I/O error.
Workaround: Upgrade the service domain to Solaris 10 5/09.