The OS sees the drives:
[2:0:0:0] tape HP Ultrium 4-SCSI R500 /dev/st4
[2:0:0:1] tape HP Ultrium 4-SCSI R500 /dev/st5
[2:0:0:2] tape HP Ultrium 4-SCSI R500 /dev/st6
[2:0:0:3] tape HP Ultrium 4-SCSI R500 /dev/st7
[4:0:0:0] tape HP Ultrium 4-SCSI R500 /dev/st0
[4:0:0:1] tape HP Ultrium 4-SCSI R500 /dev/st1
[4:0:0:2] tape HP Ultrium 4-SCSI R500 /dev/st2
[4:0:0:3] tape HP Ultrium 4-SCSI R500 /dev/st3
I ran the scan, It looks like it sees all 8 drives too:
frux0273:/usr/openv/volmgr/bin # ./scan
************************************************************
*********************** SDT_TAPE ************************
*********************** SDT_CHANGER ************************
************************************************************
------------------------------------------------------------
Device Name : "/dev/nst7"
Passthru Name: "/dev/sg239"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 4-SCSI R500"
Vendor ID : "HP "
Product ID : "Ultrium 4-SCSI "
Product Rev: "R500"
Serial Number: "SG11029135"
WWN : ""
WWN Id Type : 0
Device Identifier: "HP Ultrium 4-SCSI SG11029135"
Device Type : SDT_TAPE
NetBackup Drive Type: 3
Removable : Yes
Device Supports: SCSI-3
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/nst6"
Passthru Name: "/dev/sg238"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 4-SCSI R500"
Vendor ID : "HP "
Product ID : "Ultrium 4-SCSI "
Product Rev: "R500"
Serial Number: "SG11029134"
WWN : ""
WWN Id Type : 0
Device Identifier: "HP Ultrium 4-SCSI SG11029134"
Device Type : SDT_TAPE
NetBackup Drive Type: 3
Removable : Yes
Device Supports: SCSI-3
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/nst5"
Passthru Name: "/dev/sg237"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 4-SCSI R500"
Vendor ID : "HP "
Product ID : "Ultrium 4-SCSI "
Product Rev: "R500"
Serial Number: "SG11029133"
WWN : ""
WWN Id Type : 0
Device Identifier: "HP Ultrium 4-SCSI SG11029133"
Device Type : SDT_TAPE
NetBackup Drive Type: 3
Removable : Yes
Device Supports: SCSI-3
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/nst4"
Passthru Name: "/dev/sg236"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 4-SCSI R500"
Vendor ID : "HP "
Product ID : "Ultrium 4-SCSI "
Product Rev: "R500"
Serial Number: "SG11029132"
WWN : ""
WWN Id Type : 0
Device Identifier: "HP Ultrium 4-SCSI SG11029132"
Device Type : SDT_TAPE
NetBackup Drive Type: 3
Removable : Yes
Device Supports: SCSI-3
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/nst3"
Passthru Name: "/dev/sg235"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 4-SCSI R500"
Vendor ID : "HP "
Product ID : "Ultrium 4-SCSI "
Product Rev: "R500"
Serial Number: "SG11029123"
WWN : ""
WWN Id Type : 0
Device Identifier: "HP Ultrium 4-SCSI SG11029123"
Device Type : SDT_TAPE
NetBackup Drive Type: 3
Removable : Yes
Device Supports: SCSI-3
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/nst2"
Passthru Name: "/dev/sg234"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 4-SCSI R500"
Vendor ID : "HP "
Product ID : "Ultrium 4-SCSI "
Product Rev: "R500"
Serial Number: "SG11029122"
WWN : ""
WWN Id Type : 0
Device Identifier: "HP Ultrium 4-SCSI SG11029122"
Device Type : SDT_TAPE
NetBackup Drive Type: 3
Removable : Yes
Device Supports: SCSI-3
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/nst1"
Passthru Name: "/dev/sg233"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 4-SCSI R500"
Vendor ID : "HP "
Product ID : "Ultrium 4-SCSI "
Product Rev: "R500"
Serial Number: "SG11029121"
WWN : ""
WWN Id Type : 0
Device Identifier: "HP Ultrium 4-SCSI SG11029121"
Device Type : SDT_TAPE
NetBackup Drive Type: 3
Removable : Yes
Device Supports: SCSI-3
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/nst0"
Passthru Name: "/dev/sg232"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 4-SCSI R500"
Vendor ID : "HP "
Product ID : "Ultrium 4-SCSI "
Product Rev: "R500"
Serial Number: "SG11029120"
WWN : ""
WWN Id Type : 0
Device Identifier: "HP Ultrium 4-SCSI SG11029120"
Device Type : SDT_TAPE
NetBackup Drive Type: 3
Removable : Yes
Device Supports: SCSI-3
Flags : 0x0
Reason: 0x0
frux0273:/usr/openv/volmgr/bin #