How to change the dump directory on a soalris server

HOW TO CHANGE THE DUMP DIRECOTRY

# dumpadm -d /dev/dsk/c0t0d0s1
Dump content: kernel pages
Dump device: /dev/dsk/c0t0d0s1 (dedicated)
Savecore directory: /var/crash/unknown
Savecore enabled: no
# dumpadm -y
Dump content: kernel pages
Dump device: /dev/dsk/c0t0d0s1 (dedicated)
Savecore directory: /var/crash/unknown
Savecore enabled: yes