IBM TS2340 User Guide - Page 87
Determine the Device Hardware Path for Magstar MP 3575 Tape Libraries, ioscan -f -C ext_bus
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HP-UX Device Driver (ATDD) 56/40.3.0 56/40.3.1 Determine the Device Hardware Path for Magstar MP 3575 Tape Libraries: Each drive in a 3575 library can support an automation path for the logical library of which it is a member by sending SCSI Medium Changer commands to LUN 1 of the drive port. The 3575 Model L06 supports one logical library. The other 3575 tape libraries (Models L12, L18, L24, and L32) can support two or three logical libraries depending on the specific model. The first drive in each logical library must have LUN 1 configured to operate the automation for that logical library (drive 1 for logical library 1, drive 3 for logical library 2, and drive 5 for logical library 3). Other drives may have LUN 1 configured, but this is optional. LUN 1 control of the library mechanism can be configured for any drive by way of the front panel on the library. Conceivably, LUN 1 could be configured for two drives in the same logical library, but this is unnecessary in most instances. In that case, the automation conforms to the SCSI-3 Primary Commands standard for multiple port behavior (except for the handling of reservations). Access to a logical library is on a first-come, first-served basis for hosts accessing the same logical library on different ports. Each port can accept commands while the library is in use by another host by way of another port. The 3575 deviates from the SCSI-3 specification in that device and element reservations issued on one port apply only to those hosts that access that port. Initiators connected to the same logical library through an alternate port are not subject to those reservations. Special files for operation of the 3575 automation are based on the hardware path definitions present in the atdd.cfg file. Target device LUN 1 also needs to be enabled at the library operator panel for drives other than the first drive in each logical library if they are used to accept automation commands. LUN 1 for the first drive in each logical library is mandatory and is enabled automatically by the library firmware. To determine the device hardware path, follow these steps: 1. Run ioscan to determine which SCSI adapter the Magstar MP library drive is connected to. # ioscan -f -C ext_bus 2. Record the hardware path entry of the adapter: For example, 56/40 3. Determine the SCSI target addresses of the Magstar MP drives. The panel on the front of the 3575 library displays the selected target addresses. HWPATH = adapterpath.drivetargetaddress1.0 (Magstar MP drive) HWPATH = adapterpath.drivetargetaddress2.0 (Magstar MP drive) HWPATH = adapterpath.drivetargetaddress1.1 (3575 library control path) For a 3575 library with two drives in one logical library (drive 1 at SCSI target 3 and drive 2 at SCSI target 4), the device hardware paths are: 56/40.3.0 56/40.4.0 56/40.3.1 Chapter 4. HP-UX Tape and Medium Changer Device Driver 69