Mark,
Regarding your recent update to add option fifo: /var/tmp/mhvtl in device.conf, the default config file does not include an entry for the library .. No sure if you have left this out by design or not.
Library: 10 CHANNEL: 00 TARGET: 00 LUN: 00
Vendor identification: STK
Product identification: L700
Unit serial number: XYZZY_A
NAA: 10:22:33:44:ab:00:00:00
Drive: 11 CHANNEL: 00 TARGET: 01 LUN: 00
Library ID: 10 Slot: 01
Vendor identification: IBM
Product identification: ULT3580-TD5
Unit serial number: XYZZY_A1
NAA: 10:22:33:44:ab:00:01:00
Compression: factor 1 enabled 1
fifo: /var/tmp/mhvtl
.......
Library: 30 CHANNEL: 00 TARGET: 08 LUN: 00
Vendor identification: STK
Product identification: L80
Unit serial number: XYZZY_B
NAA: 30:22:33:44:ab:00:08:00
Drive: 31 CHANNEL: 00 TARGET: 09 LUN: 00
Library ID: 30 Slot: 01
Vendor identification: STK
Product identification: T10000B
Unit serial number: XYZZY_B1
NAA: 30:22:33:44:ab:00:09:00
Compression: factor 1 enabled 1
fifo: /var/tmp/mhvtl
-nia