[Sunhelp] backup root

[Habib M.]

Hi,
In my ssol 2.6, i am trying to create a backup root in the
external drive, partition 0:.

I use the:
/isr/sbin/installboot /usr/lib/fs/ufs/bootblk/dev/rdsk/c0t1d0s0

I get the error: Usage: installboot bootblk rw-device

what is wrong?. What is the solution? Actually i do have the bootblk in the 
/ufs dir.
HM
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