Check Backup Tape Block Size

用以下的腳本可以很方便地知道備份帶的塊大小(Block Size)和類型(Type)：

#!/bin/ksh

tctl rewind

chdev -l rmt0 -a block_size=0

dd if=/dev/rmt0 bs=128k of=blksz_file count=1

echo Tape Block Size = $(ls -l ./blksz_file | awk '{print $5}')

echo Tape Format = $(file ./blksz_file | while read a b;do echo $b;done)