IBM TS2340 User Guide - Page 166

tapelist -l, Notes, Create the entry for persistent naming. Determine the target address

Page 166 highlights

Solaris Device Driver (IBMtape) Persistent Naming Support The device special file names are created by the IBMtape driver in the order that the tape devices are presented by the Solaris system. Each device special file name is maintained with the same logical name across reboots, even when an existing device is powered off or not connected. However, the logical names of devices may be changed due to the swapping of connecting cables, HBA mapping changes, tape device driver updates, or other reasons. The user can rename the logical name by editing the /etc/devlink.tab system file for the persistent name binding and reloading the IBMtape driver as follows: 1. Before the persistent name binding, make sure that the IBM tape devices are configured at the different target and LUN addresses if the devices are attached on more than one HBA. The Ultrium-3 tape drive is connected to two Emulex HBAs with the same address of target 3 and LUN 0 via a switch in the following example. You have to use the HBA utility, follow HBA vendor instructions, or both to persistently bind the tape devices at the different mapped target and LUN. # tapelist -l Inst# Special File Device Serial No 454 /dev/rmt/2st ULT3580-TD3 1210003557 582 /dev/rmt/8st ULT3580-TD3 1210003557 TGT/LUN Device Physical Path 3/0 /devices/pci@6,2000/pci@1/fibre-channel@5/IBMtape@3,0 3/0 /devices/pci@1f,2000/pci@1/fibre-channel@5/IBMtape@3,0 The tape drive is mapped at target 3, LUN 0 on HBA 1 and target 24, LUN 0 on HBA 2 after device persistent binding. # tapelist -l Inst# Special File Device 454 /dev/rmt/4st ULT3580-TD3 1136 /dev/rmt/7st ULT3580-TD3 Serial No --------1210003557 1210003557 TGT/LUN ---------- 3/0 24/0 Device Physical Path devices/pci@6,2000/pci@1/fibre-channel@5/IBMtape@3,0 /devices/pci@1f,2000/pci@1/fibre-channel@5/IBMtape@18,0 Note: Device persistent binding is not provided on Sun HBAs, so this persistent name approach cannot be used with the same physical drive that is attached to multiple Sun HBA ports. 2. Start persistent name binding. In this example, the user renames 4st and 7st to 10st and 11st. a. Create the entry for persistent naming. Determine the target address from the Device Physical Path in the output of tapelist -l and add the planned device special file name in the entry. Here, 4st and 7st drives are located at 3,0 (target 3, LUN 0) and 18,0 (target 24 (0x18), LUN 0) at the device physical paths of /devices/pci@6,2000/pci@1/fibre-channel@5/IBMtape@3,0 and /devices/pci@1f,2000/pci@1/fibre-channel@5/IBMtape@18,0. Add the address and device file name into the entries: type=ddi_byte:tape;addr=3,0; rmt/10\M0 type=ddi_byte:tape;addr=18,0; rmt/11\M0 Notes: 1) A tab is entered between addr=3,0; and rmt/10\M0. 2) The 0 in the entry is the zero in M0. 148 IBM Tape Device Drivers Installation and User's Guide

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Persistent Naming Support
The device special file names are created by the IBMtape driver in the order that
the tape devices are presented by the Solaris system. Each device special file name
is maintained with the same logical name across reboots, even when an existing
device is powered off or not connected.
However, the logical names of devices may be changed due to the swapping of
connecting cables, HBA mapping changes, tape device driver updates, or other
reasons.
The user can rename the logical name by editing the
/etc/devlink.tab
system file for
the persistent name binding and reloading the IBMtape driver as follows:
1.
Before the persistent name binding, make sure that the IBM tape devices are
configured at the different target and LUN addresses if the devices are attached
on more than one HBA.
The Ultrium-3 tape drive is connected to two Emulex HBAs with the same
address of target 3 and LUN 0 via a switch in the following example. You have
to use the HBA utility, follow HBA vendor instructions, or both to persistently
bind the tape devices at the different mapped target and LUN.
# tapelist -l
Inst#
Special File
Device
Serial No
TGT/LUN
Device Physical Path
------ -------------- ------------- ------------
--------
-------------------------------------
454
/dev/rmt/2st
ULT3580-TD3
1210003557
3/0
/devices/pci@6,2000/pci@1/fibre-channel@5/IBMtape@3,0
582
/dev/rmt/8st
ULT3580-TD3
1210003557
3/0
/devices/pci@1f,2000/pci@1/fibre-channel@5/IBMtape@3,0
The tape drive is mapped at target 3, LUN 0 on HBA 1 and target 24, LUN 0
on HBA 2 after device persistent binding.
# tapelist -l
Inst#
Special File
Device
Serial No
TGT/LUN
Device Physical Path
------ --------------- -----------
---------
----------
----------------------------------------
454
/dev/rmt/4st
ULT3580-TD3
1210003557
3/0
/devices/pci@6,2000/pci@1/fibre-channel@5/IBMtape@3,0
1136 /dev/rmt/7st
ULT3580-TD3
1210003557
24/0
/devices/pci@1f,2000/pci@1/fibre-channel@5/IBMtape@18,0
Note:
Device persistent binding is not provided on Sun HBAs, so this
persistent name approach cannot be used with the same physical drive
that is attached to multiple Sun HBA ports.
2.
Start persistent name binding. In this example, the user renames
4st
and
7st
to
10st
and
11st
.
a.
Create the entry for persistent naming. Determine the target address from
the Device Physical Path in the output of
tapelist -l
and add the planned
device special file name in the entry. Here, 4st and 7st drives are located at
3,0 (target 3, LUN 0) and 18,0 (target 24 (0x18), LUN 0) at the device
physical paths of
/devices/pci@6,2000/pci@1/fibre-channel@5/IBMtape@3,
0
and
/devices/pci@1f,2000/pci@1/fibre-channel@5/IBMtape@18,0
. Add the
address and device file name into the entries:
type=ddi_byte:tape;addr=3,0;
rmt/10\M0
type=ddi_byte:tape;addr=18,0;
rmt/11\M0
Notes:
1)
A tab is entered between addr=3,0; and rmt/10\M0.
2)
The 0 in the entry is the zero in M0.
Solaris Device Driver (IBMtape)
148
IBM Tape Device Drivers Installation and User’s Guide