You should have the following information on hand when you troubleshoot Solaris Volume Manager problems:
Output from the metadb command
Output from the metastat command
Output from the metastat -p command
Backup copy of the /etc/vfstab file
Backup copy of the /etc/lvm/mddb.cf file
Disk partition information from the prtvtoc command (SPARC® systems) or the fdisk command (x86 based systems)
The Solaris version on your system
A list of the Solaris patches that have been installed
A list of the Solaris Volume Manager patches that have been installed
Any time you update your Solaris Volume Manager configuration, or make other storage or operating system-related changes to your system, generate fresh copies of this configuration information. You could also generate this information automatically with a cron job.