Problem with backup

[moloko]

I made four test backup
# ufsdump 0ucf /dev/rmt/0n /test
...
Run
#mt -f /dev/rmt/0n stat
Vendor 'Seagate' Product 'STT8000N'
file no= 4 block no= 0

After that I want to see first or second dump. How to do it?

I run
#ufsrestore -tfs /dev/rmt/0n 4
Media read error: I/O error

or
#mt -f /dev/rmt/on fsf 3
/dev/rmt/on fsf 3 failed: I/O error

I looked file /etc/dumpdates and it was empty.
Where I have problem?

 

[jad]

mt -f /dev/rmt/0 rewind # place you at the beginning of the tape

ufsrestore vfs /dev/rmt/0 1 # for first
ufsrestore vfs /dev/rmt/0 2 # for second
ufsrestore vfs /dev/rmt/0 3 # for third
ufsrestore vfs /dev/rmt/0 4 # for fourth

mt -f /dev/rmt/0n eom # place you at the end of the tape