> On some systems, reboot is required? to access disk from SAN device.
This turned out to be a zoning issue. Although I had properly created the zone, I had to add it to our "Prod" configuration to make it live. Once that was done, the virtual tape library was recognized right away:
kernel: Vendor: HP Model: MSL G3 Series Rev: EL21
kernel: Type: Medium Changer ANSI SCSI revision: 03
kernel: scsi 0:0:0:0: Attached scsi generic sg0 type 8
kernel: Vendor: HP Model: Ultrium 4-SCSI Rev: ED41
kernel: Type: Sequential-Access ANSI SCSI revision: 03
kernel: scsi 0:0:1:0: Attached scsi generic sg1 type 1
kernel: st: Version 20070203, fixed bufsize 32768, s/g segs 256
kernel: st 0:0:1:0: Attached scsi tape st0
kernel: st0: try direct i/o: yes (alignment 512 B)
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