Air Cleaner User Manual

tape, then select “no” to place this backup on the tape at the
current location. This option is displayed only when you back
up to a tape device. For a system backup, tape boot information
is placed on the tape at the beginning of the first backup. This
information is not placed on the tape for subsequent backups.
Note: If this is the first backup to this tape, or if you have
restarted the system, reinserted the tape, or changed the
tape drive block size, you should select to rewind the
tape. Only if you completed another backup and have
not performed any of these functions will the tape be
positioned correctly at the end of the previous backup
image.
Forward to End of Tape Before Starting Backup
Forwards to the end of the last SysBack backup on the tape for
all backup types. Use this option when stacking multiple
backups on a tape that has been rewound or ejected. Also use
this option when the system has been restarted or when the
block size of the tape driver has been changed from the last
backup.
Buffer size (In Kbytes)
Default=64. Changing this value either increases or decreases
the amount of data that is written to the output device in a
single I/O operation. Some devices with small buffers might
require you to reduce this value, while other devices with very
large buffers can benefit from increased performance by
increasing this value. If you are unsure, use the default value.
This value must be a multiple of the tape block size.
Preserve physical partition mapping?
Default=no. Selecting “yes” to this option ensures that all
logical volumes will be recreated from this backup using the
same physical partitions that are currently allocated to them.
Unless the logical volumes were originally created using
physical partition maps, it is generally recommended that they
not be recreated using the same partitions, because this
preserves fragmentation that develops over time as logical
volumes and file systems expand.
When you recreate a volume group or logical volume or
perform a system installation, you can choose whether or not to
use the prior partition map. If the original physical volumes do
not exist or are not large enough to contain the same partitions,
the logical volumes will be recreated without using the maps.
Device name for remote volume prompt
Default=(Blank/None). Enter a TTY, LFT or PTS device name to
send the volume prompt to a specified device rather than to the
current SMIT screen. If you are backing up to a remote host,
the device name you specify is attached to the remote host.
This field is displayed only when the backup device is a tape
drive or virtual device.
Examples of device names are /dev/tty0, /dev/lft0 and /dev/pts/5.
You can determine the terminal device name by typing tty at
the command line on that device.
4-24 IBM Tivoli Storage Manager for System Backup and Recovery: Installation and User’s Guide