SL48 / SL24 SAS Medium changer is not visible

Asset ID:	1-72-2023453.1
Update Date:	2016-10-21
Keywords:

Solution Type Problem Resolution Sure

Solution 2023453.1 : SL48 / SL24 SAS Medium changer is not visible

Applies to:

Sun StorageTek SL48 Tape Library - Version All Versions and later
Sun StorageTek SL24 Tape Autoloader - Version All Versions and later
Solaris Operating System - Version 10 9/10 U9 and later
Oracle Solaris on SPARC (64-bit)
Oracle Solaris on x86-64 (64-bit)

Symptoms

The SL48 ort SL24 SAS robotic is not visible in "cfgadm -alv" output and not reported in "prtpicl -v":

# cfgadm -alv
...

c4                             connected    configured   unknown
unavailable  scsi-sas     n        /devices/pci@0,0/pci8086,340c@5/pci1000,30b0@0/iport@4:scsi
c4::rmt/1                      connected    configured   unknown    HP Ultrium 5-SCSI
unavailable  tape         n        /devices/pci@0,0/pci8086,340c@5/pci1000,30b0@0/iport@4:scsi::rmt/1
c5                             connected    configured   unknown
unavailable  scsi-sas     n        /devices/pci@0,0/pci8086,340c@5/pci1000,30b0@0/iport@8:scsi
c5::rmt/0                      connected    configured   unknown    HP Ultrium 5-SCSI
unavailable  tape         n        /devices/pci@0,0/pci8086,340c@5/pci1000,30b0@0/iport@8:scsi::rmt/0

The device may also be visible and attached to the "nulldriver":

# cfgadm -alv
...
c8                             connected    configured   unknown
unavailable scsi-sas     n        /devices/pci@78,0/pci8086,e0a@3,2/pci1000,30b0@0/iport@8:scsi
c8::nulldriver0                connected    configured   unknown    HP MSL G3 Series
unavailable med-changer n        /devices/pci@78,0/pci8086,e0a@3,2/pci1000,30b0@0/iport@8:scsi::nulldriver0
c8::rmt/0                      connected    configured   unknown    HP Ultrium 4-SCSI
unavailable tape         n        /devices/pci@78,0/pci8086,e0a@3,2/pci1000,30b0@0/iport@8:scsi::rmt/0

Changes

3rd party robotic driver was removed or incorrect changes was done in /etc driver configuration files.

Cause

The changer should be seen on the same controller than the tape drive.
The tape drive is assigned lun 0 and the changer lun 1 as seen in the following output taken on an S11.2 system:

# cfgadm -alv
...
c8                             connected    configured   unknown
unavailable scsi-sas     n        /devices/pci@78,0/pci8086,e0a@3,2/pci1000,30b0@0/iport@8:scsi
c8::rmt/0                      connected    configured   unknown    HP Ultrium 4-SCSI
unavailable tape         n        /devices/pci@78,0/pci8086,e0a@3,2/pci1000,30b0@0/iport@8:scsi::rmt/0
c8::scsi/changer/c8t500110A00 connected    configured   unknown    HP MSL G3 Series
unavailable med-changer n        /devices/pci@78,0/pci8086,e0a@3,2/pci1000,30b0@0/iport@8:scsi::scsi/changer/c8t500110A0008B42D2d1

By default the med-changer of SL24/48 is handled by the Solaris sgen driver.
If the line <<"scsiclass,08" sgen>> is missing from /etc/driver_aliases no driver will attach to the device and no device driver instance and device link will be created.

Solution

The solution is to reconfigure the sgen driver using the following commands:

# rem_drv sgen
# add_drv -i '"scsiclass,08"' sgen

If the robotic was handled by a 3rd party robotic driver please refer to the support representative of the 3rd party product.

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