IBM TS2340 User Guide - Page 53

Special Files for Medium Changer Devices, Special File Name, Rewind on, Close Note 1, Retension

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AIX Device Driver (Atape) Table 6. Special Files for Tape Devices Special File Name Rewind on Close (Note 1) /dev/rmt* Yes /dev/rmt*.1 No /dev/rmt*.2 Yes /dev/rmt*.3 No /dev/rmt*.4 Yes /dev/rmt*.5 No /dev/rmt*.6 Yes /dev/rmt*.7 No /dev/rmt*.10 (Note 4) No /dev/rmt*.20 Yes /dev/rmt*.40 Yes /dev/rmt*.41 No /dev/rmt*.60 Yes /dev/rmt*.null (Note 5) Yes /dev/rmt*.smc (Note 6) N/A Retension on Open (Note 2) No No Yes Yes No No Yes Yes No No No No No No N/A Bytes per Inch (Note 3) N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Trailer Label No No No No No No No No No No Yes Yes Yes No N/A Unload on Close No No No No No No No No No Yes No No Yes No N/A Notes: 1. The Rewind on Close special files write filemarks under certain conditions before rewinding. 2. The Retension on Open special files rewind the tape on open only. Retensioning is not performed because these tape products perform the retension operation automatically when needed. 3. The Bytes per Inch options are ignored for the tape devices supported by this driver. The density selection is automatic. 4. The rmt*.10 file bypasses normal close processing , and the tape is left at the current position. 5. The rmt*.null file is a pseudo device similar to the /dev/null AIX special file. The input/output control (ioctl) calls can be issued to this file without a real device attached to it, and the device driver returns a successful completion. Read and write system calls return the requested number of bytes. This file can be used for application development or debugging problems. 6. The rmt*.smc file can be opened independently of the other tape special files. Special Files for Medium Changer Devices After the driver is installed and a medium changer device is configured and made available for use, access to the robotic device is provided through the smc* special file in the /dev directory. Table 7 shows the attributes of the special file. The asterisk (*) represents a number assigned to a particular device (such as smc0). The term smc is used for a SCSI medium changer device. The smc* special file provides a path for issuing commands to control the medium changer robotic device. For more information, refer to Table 7. Table 7. Special Files for Medium Changer Devices Special File Name /dev/smc* /dev/smc*.null Description Access to the medium changer robotic device Pseudo medium changer device Chapter 3. AIX Tape and Medium Changer Device Driver 35

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Table 6. Special Files for Tape Devices
Special File Name
Rewind on
Close (Note 1)
Retension on
Open (Note 2)
Bytes per Inch
(Note 3)
Trailer Label
Unload on
Close
/dev/rmt*
Yes
No
N/A
No
No
/dev/rmt*.1
No
No
N/A
No
No
/dev/rmt*.2
Yes
Yes
N/A
No
No
/dev/rmt*.3
No
Yes
N/A
No
No
/dev/rmt*.4
Yes
No
N/A
No
No
/dev/rmt*.5
No
No
N/A
No
No
/dev/rmt*.6
Yes
Yes
N/A
No
No
/dev/rmt*.7
No
Yes
N/A
No
No
/dev/rmt*.10 (Note 4)
No
No
N/A
No
No
/dev/rmt*.20
Yes
No
N/A
No
Yes
/dev/rmt*.40
Yes
No
N/A
Yes
No
/dev/rmt*.41
No
No
N/A
Yes
No
/dev/rmt*.60
Yes
No
N/A
Yes
Yes
/dev/rmt*.null (Note 5)
Yes
No
N/A
No
No
/dev/rmt*.smc (Note 6)
N/A
N/A
N/A
N/A
N/A
Notes:
1.
The Rewind on Close special files write filemarks under certain conditions before rewinding.
2.
The Retension on Open special files rewind the tape on open only. Retensioning is not performed because these
tape products perform the retension operation automatically when needed.
3.
The Bytes per Inch options are ignored for the tape devices supported by this driver. The density selection is
automatic.
4.
The
rmt*.10
file bypasses normal close processing , and the tape is left at the current position.
5.
The
rmt*.null
file is a pseudo device similar to the
/dev/null
AIX special file. The input/output control (
ioctl
) calls
can be issued to this file without a real device attached to it, and the device driver returns a successful
completion. Read and write system calls return the requested number of bytes. This file can be used for
application development or debugging problems.
6.
The
rmt*.smc
file can be opened independently of the other tape special files.
Special Files for Medium Changer Devices
After the driver is installed and a medium changer device is configured and made
available for use, access to the robotic device is provided through the
smc*
special
file in the
/dev
directory.
Table 7 shows the attributes of the special file. The asterisk (*) represents a number
assigned to a particular device (such as
smc0
). The term
smc
is used for a SCSI
medium changer device. The
smc*
special file provides a path for issuing
commands to control the medium changer robotic device. For more information,
refer to Table 7.
Table 7. Special Files for Medium Changer Devices
Special File Name
Description
/dev/smc*
Access to the medium changer robotic device
/dev/smc*.null
Pseudo medium changer device
AIX Device Driver (Atape)
Chapter 3. AIX Tape and Medium Changer Device Driver
35