Problems with SCSI tape drives
You may encounter the following problems with
SCSI tape drives:
SCSI tape drive not recognized
For SCSI tape drives, a message similar to the
following is displayed at system startup even if the tape drive is not
present on the SCSI bus:
%tape - - - type=S ha=0 id=2 lun=0
A message similar to the following is displayed when you try
to access the tape when there is a problem:
NOTICE: ha: No controller response on SCSI adapter (ha=n id=n lun=n)
NOTICE: Stp: Stp_call_oemtab - Inquiry failed on SCSI type n dev minor/n
(ha=n id=n lun=n)
/dev/rct0: cannot open
To correct the problem:
If the tape drive is external to the computer, check that it is
powered on and that the SCSI bus is correctly terminated.
If the tape drive is internal to the computer, check that it
initializes a tape when you insert one in the drive.
Verify that the ID number for the controller of
the device is correct and does not clash with the
ID of any other device on the SCSI
The ID number is determined by the jumper
settings on the controller.
The valid range is 07 for SCSI-1 and 015
for a 16-bit Wide SCSI-2,
Ultra-SCSI (SCSI-III), or Ultra2SCSI bus.
tape drives are often configured for ID 2.
Make sure that the host adapter number is correct.
The first SCSI
host adapter of a given type is 0; the second is 1.
Check that the LUN (Logical Unit Number) is correct.
In most cases, the controller is embedded in the same
physical unit as the device and supports one device with
LUN 0. If the controller is not embedded, it
supports up to eight devices. If this is the case, the
LUN is determined by the jumper settings on each
device. The valid range is 07.
Verify that the host adapter itself is recognized at boot time.
Verify that the tape drive is supported.
Refer to the
SCO Certified and Compatible Hardware web page (CHWP)
for a list of supported tape drives.
Cannot access SCSI tape drive with /dev/rct0
After an Upgrade installation,
/dev/rct0 might no longer exist.
When you try to access a configured SCSI tape drive,
you might see the error:
cannot open: /dev/rct0
If the device is correctly configured
with mkdev tape,
you can access the tape drive
Using the dd(C) command with Exabyte 8mm tapes
Do not use dd to put individual data files
onto Exabyte 8mm tapes; extracting the files may cause
extraneous characters to be appended to the original data.
You can, however, use dd with Exabyte 8mm
tapes to store and extract
Waiting for DAT and Exabyte 8mm tape drives to initialize
You should wait for a DAT or Exabyte 8mm drive
to finish its initialization sequence before attempting
to access the device. This may take 30 seconds or more.
Problems with Irwin and QIC-40/80 tape drives
Cannot open /dev/rct0 error message
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003