06-24-2006
restore -Tqv should print the contents of the tape to your term session, but sounds as if you've already gone down that road... is it possible that you've generated the backup on one machine and are trying to read it on another? If so, verify that you have the blocksize set correctly. If the tape was created on a machine with blocksize set to 512 bytes (if my memory isn't failing me this setting is mandatory for mksysb creation / restore to work correctly and possibly also savevg), then my understanding has always been that the blocksize on the machine reading the tape must also be 512. The command: "lsattr -El rmt0" should tell you the tape drive setting (assuming tape drive is rmt0, change device name if appropriate), and chdev -a blksize=512 -l rmt0 should set it correctly. Apologies if the commands are not exactly correct as working from memory with no AIX host immediately available.
Hope this helps >< bOOtnix
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tz(4) Kernel Interfaces Manual tz(4)
Name
tz - SCSI magnetic tape interface
Syntax
VAX NCR 5380:
adapter uba0 at nexus?
controller scsi0 at uba0 csr 0x200c0080 vector szintr
tape tz0 at scsi0 drive 0
VAX DEC SII:
adapter ibus0 at nexus?
controller sii0 at ibus? vector sii_intr
tape tz0 at sii0 drive 0
RISC DEC SII:
adapter ibus0 at nexus?
controller sii0 at ibus? vector sii_intr
tape tz0 at sii0 drive 0
RISC DEC KZQ:
adapter uba0 at nexus?
controller kzq0 at ibus? csr 0761300vector sii_intr
tape tz0 at kzq0 drive 0
RISC NCR ASC:
adapter ibus0 at nexus?
controller asc0 at ibus? vector ascintr
tape tz0 at asc0 drive 0
Description
The SCSI tape driver provides a standard tape drive interface as described in This is a driver for any Digital SCSI tape device.
For the TZK10 QIC format tape drive, the densities supported are QIC-24 (read only) block size of 512 byte blocks, QIC-120, and QIC-150
read/write block size of 512 byte blocks, and QIC-320 read/write block size of 1024 byte blocks. With QIC format style tapes all reads and
writes must be in multiple of the block size. This is a requirement of fixed block tape drives because record boundaries are not pre-
served. The QIC densities are selected using the following special device names:
QIC-24 Fixed block size.
QIC-120 Fixed block size.
QIC-150 Fixed block size.
QIC-320 Fixed block size.
With all fixed block tape devices a of a file to the tape must be padded out. An example of this is a of which has a size of approximately
3800 bytes.
dd if=/etc/gettytab of=/dev/rmt0h bs=10k conv=sync
or
dd if=/etc/gettytab of=/dev/rmt0l bs=512 conv=sync
The option of pads the output to block size.
This driver also supports n-buffered reads and writes to the raw tape interface (used with streaming tape drives). See for further
details.
Tape Support
TZ30, TZK50, TLZ04, TSZ05, TKZ08, TZK10
Diagnostics
All diagnostic messages are sent to the error logger subsystem.
Files
See Also
mtio(4), nbuf(4), SCSI(4), MAKEDEV(8), uerf(8), tapex(8)
Guide to the Error Logger
tz(4)