HP Ultrium tape drives Q1538-90925 - Manual (Page 28)

Verifying the Installation 28
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NOTE: Make sure you prefix the file name with ‘.’ when you back it up to tape. If you do not, the
restore operation in step 3 will overwrite the original copy on disk.
3. Read the file back from tape:
% cd /t mp
% tar x vf <devi ce file>
The ‘x’ option to tar here means “extract from the archive”.
Use the same value for the <device file> argument as in step 2.
4. Compare the original with this retrieved file:
% cmp < original file> /t mp/<retri eved file >
This compares the files byte by byte. If they are the same, there should be no output, and this
verifies that the installation is correct. The arguments are:
Example
Suppose you are verifying the installation of an HP Ultrium tape drive on an HP-UX 11.X system. The
procedure would be as follows.:
1. Change directory to root:
% cd /
2. Back up /stand/vmunix to tape:
% tar c vf /dev/ rmt/0m ./ stand/vmu nix
Note the prefix of ‘.’ to the filename.
3. Change to the temporary directory:
% cd /tmp
4. Extract the file from the tape:
% tar xvf /de v/rmt/0m
5. Compare the original with the restored version:
% cmp /stand/ vmunix /t mp/stand/ vmunix
Note that the original filename is not prefixed with ‘.’.
<original file>
The name of the original file, prefixed with ‘/’.
Example: /stand/vmunix
<retrieved file>
The name of the file retrieved from the archive.
Example: stand/vmunix