a) implementing disk mirroring in Free BSD server (for both System & Datafiles)
This has already been answered. vinum, ccd.
b) Is it possible to make any backup NIS server, which will backup the data & will come up when Primary server goes down.
Yes, it's possible to promote a backup NIS server to be the master if the master NIS server goes down. Normally, that level of failover doesn't need to happen: if you have a problem and the master goes down, the clone server stays up read-only while you fix the master. You'd promote the backup/clone NIS server only if you couldn't fix or restore the master...
-- -Chuck
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