YES certified tape drive not recognised on sles10sp1

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Hi!

I am running sles10sp1 64 bit on IBM xSeries 3650, and want to connect an HP 920 ultrium external sas tape drive using a straight through mini sas cable to the builtin the ServeRAID 8k controller.

This works fine at the bios level: the RAID controller (ServeRAID 8k) identifies the tapedrive, and the bios diagostics work. However: suse sees absolutely nothing. From what I understand from the novell website, this particular tapedrive is "fully supported": HP StorageWorks Ultrium 920 SAS Tape Drive

The tape drive is connected (according to the bios diags) to SCSI Bus 1 (ID 1, LUN 0) while the harddisks are connected to Bus 0 (ID 0, 1, 2 and 3)

"modprobe st" loads the module, but still gives no /dev/st0.

server:~ # lsmod |egrep '^(sd|st|sg|aic|scsi)'
st 42532 0
sg 40248 0
sd_mod 25728 4
scsi_mod 156856 6 st,sg,aacraid,sr_mod,libata,sd_mod

According to the novell YES site, the "primary drivers" are: mptsas, scsi_transport_sas, mptscsih, mptbase, which I have all modprobed, with no result at all.

I happen to have a second, identical machine, tried to connect it there too: same problem. I also tried the ubuntu 8.04 server live cd and the OpenSUSE 10.3 installation: they see the tape drive immediately, no problems whatsoever.

What could be the problem here? Do I need to do anything else to get sles to see the tape drive? I did not install any drivers, because I'm under the impression that I don't need those. Am I missing something?

oh, maybe of interest:
server:~ # cat /proc/scsi/scsi
Attached devices:
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: MATSHITA Model: UJDA770 DVD/CDRW Rev: 1.24
Type: CD-ROM ANSI SCSI revision: 05
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: ServeRA Model: 8k RAID5 Rev: V1.0
Type: Direct-Access ANSI SCSI revision: 02
server:~ #

I welcome any suggestion!