CHAPTER 17 Using Standard UNIX Utilities to Recover BACKUP.UNET Tables

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Use the following step-by-step instructions to recover BACKUP.UNET tables from a BACKUP.UNET tape using standard UNIX utility programs. This information pertains to release level 2.0 or higher.

To obtain tables from segment 1:

cpio -icvBdum "./NBK_home_dir/nbk-TABLES/*" < /dev/___

If you back up your system using anything other than the default blocking, then you will need to use dd with the cpio command. For example:

dd if=/dev/___ ibs=20b obs=10b | cpio -icvBdum "./NBK_home_dir/nbk-TABLES/*"
OR

tar xvf /dev/___ ./NBK_home_dir/nbk-TABLES

To obtain tables from any segment other than the first segment,

for most UNIX workstations:

mt -f /dev/___ fsf (# of tape marks)

for RS600 workstations:

tctl -f /dev/___ fsf (# of tape marks)

(You must use a no-rewind device)

To calculate the number of tape marks to skip forward, use the following formula:

Segment #-1*2

For example, if the tables are located on segment 3, you would want to skip 4 tape marks (3-1*2).

So the command would be:

mt -f /dev/___ fsf 4

OR

tctl -f /dev/___ fsf 4

After completing the above step for your workstation, use the tar or cpio command as shown above.