Air Cleaner User Manual

Depending on the type of tape drive, the options might differ from those
above.
To change the block size, enter a new block size in the BLOCK size (0=variable
length) field or press F4 for a list of valid entries.
Different tape drives might provide multiple block sizes for reading or writing
the data. Use the same block size to read a tape that used to originally write
the tape. It is generally more efficient to write tapes using larger block sizes
(such as 1024, 2048) because this will usually increase the speed at which the
data is written to the tape. It also usually increases the capacity of the tape
because fewer “inter-block gaps” are needed between blocks written.
Notes:
a. Only the root user has permission to change the block size of a tape drive.
b. When you create a system backup, the tape block size is temporarily
changed to 512-bytes, because the installation process that reads that tape is
only capable of reading the tape at 512-byte blocks.
Refer to Appendix E, “Device/System-Specific Information”, on page E-1 for
information on recommended tape drive characteristics.
4. Press Enter to change the tape drive characteristics.
Unloading or Ejecting a Tape from the Drive
You can rewind and eject the tape cartridge from either a local or remote tape
drive or virtual device, assuming the device supports auto-eject. If you select a
virtual device, the tape is ejected from all physical devices defined for the virtual
device. Whether the drive supports auto-eject or not, the drive door must be closed
again (or opened and closed) before the drive can be used again.
To eject the tape from a drive or virtual device:
1. From the Tape Drive Options menu, select Unload/Eject Tape from Drive.
Change / Show Characteristics of a Tape Drive
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
[Entry Fields]
Tape Drive rmt0
Tape Drive type 8mm5gb
Tape Drive interface scsi
Description 5.0 GB 8mm Tape Drive
Status Available
Location 04-C0-00-5,0
Parent adapter scsi0
Connection address 5,0
BLOCK size (0=variable length) [1024] +#
Use DEVICE BUFFERS during writes yes +
RETURN error on tape change or reset no +
Use EXTENDED file marks yes +
DENSITY setting #1 140 +
DENSITY setting #2 20 +
Use data COMPRESSION yes +
F1=Help F2=Refresh F3=Cancel F4=List
F5=Reset F6=Command F7=Edit F8=Image
F9=Shell F10=Exit Enter=Do
Figure 22-2. The Change/Show Characteristics of a Tape Drive menu
Chapter 22. Tape Drives 22-3