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Somebody can help me ! how can i do mirror in sun ver 8
without third party software !!!

Check out the package SUNWmd. It is known as DiskSuite. You can get on-line help at http://docs.sun.com.

To see if the package is on the system, % pkginfo -l SUNWmd
If it is, read the man pages or the Documentation on-line at the link.

If it is not installed, find it on the Solaris 8 cd.

This will help:
http://slacksite.com/solaris/disksuite/disksuite.php

Important point is that at least two disks will need a free slice, only about 20MB for DiskSuite to use and put 3 copies of the metatstate database in each, DiskDuite requires a minimum of 3 to work and of course you are planning to cope with disk failures!

So amend the above instructions, from:
# metadb -a /dev/dsk/c0t0d0s5
to:
# metadb -a -c 3 /dev/dsk/c0t0d0s5

the thread is over 7 years old O_o

so i hope the OP has found the needed answer. i'll close this one down for now.