I've had success using the passthru / sg devices for tape and robot
On "target" host:
# lsscsi -g
[0:0:0:0] disk MAXTOR ATLAS10K4_36SCA DFM0 /dev/sda /dev/sg0
[0:0:6:0] process PE/PV 1x3 SCSI BP 1.1 - /dev/sg1
[2:0:0:0] tape IBM ULT3580-TD4 8192 /dev/st0 /dev/sg2
[2:0:0:1] mediumx IBM 3573-TL 6.50 - /dev/sg3
[2:0:1:0] tape IBM ULT3580-TD4 8192 /dev/st1 /dev/sg4
[2:0:1:1] mediumx IBM 3573-TL 6.50 - /dev/sg5
# tgtadm --lld iscsi --op new --mode target --tid 1 -T
iqn.2001-04.com.example:vtl1
# tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1
--bstype=sg --device-type=pt -b /dev/sg2
# tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 2
--bstype=sg --device-type=pt -b /dev/sg3
# tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL
# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.2001-04.com.example:vtl1
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB
Online: Yes
Removable media: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: (null)
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 0 MB
Online: Yes
Removable media: No
Backing store type: sg
Backing store path: /dev/sg2
Backing store flags:
LUN: 2
Type: (null)
SCSI ID: IET 00010002
SCSI SN: beaf12
Size: 0 MB
Online: Yes
Removable media: No
Backing store type: sg
Backing store path: /dev/sg3
Backing store flags:
Account information:
ACL information:
ALL
On Initiator host:
# iscsiadm -m discovery -t sendtargets -p dpg-markh.sydlab.veritas.com
10.251.60.20:3260,1 iqn.2001-04.com.example:vtl1
# iscsiadm -m node -T iqn.2001-04.com.example:vtl1 -p 10.251.60.20 --login
Logging in to [iface: default, target: iqn.2001-04.com.example:vtl1,
portal: 10.251.60.20,3260]
Login to [iface: default, target: iqn.2001-04.com.example:vtl1,
portal: 10.251.60.20,3260]: successful
# lsscsi -g
[0:0:0:0] disk VMware, VMware Virtual S 1.0 /dev/sda /dev/sg0
[snip]
[2:0:0:0] storage IET Controller 0001 - /dev/sg12
[2:0:0:1] tape IBM ULT3580-TD4 8192 /dev/st8 /dev/sg13
[2:0:0:2] mediumx IBM 3573-TL 6.50 - /dev/sg14
# mtx -f /dev/sg14 status
Storage Changer /dev/sg14:1 Drives, 23 Slots ( 3 Import/Export )
Data Transfer Element 0:Empty
Storage Element 1:Empty
Storage Element 2:Empty
Storage Element 3:Empty
Storage Element 4:Empty
Storage Element 5:Empty
Storage Element 6:Empty
Storage Element 7:Empty
Storage Element 8:Empty
Storage Element 9:Full :VolumeTag=QU5448L1
Storage Element 10:Empty
Storage Element 11:Empty
Storage Element 12:Empty
Storage Element 13:Empty
Storage Element 14:Empty
Storage Element 15:Empty
Storage Element 16:Empty
Storage Element 17:Empty
Storage Element 18:Empty
Storage Element 19:Empty
Storage Element 20:Empty
Storage Element 21 IMPORT/EXPORT:Full
Storage Element 22 IMPORT/EXPORT:Empty
Storage Element 23 IMPORT/EXPORT:Empty
Cheers
Mark
On Thu, Jul 29, 2010 at 4:53 AM, Tim Small <tim at seoss.co.uk> wrote:
> Hi,
>
> I was wondering if it's currently possible to use tgtd to pass through a
> real SCSI tape drive? The closest I got was this:
>
> ./tgtadm -d --lld iscsi --op new --mode logicalunit --tid 3 --lun 2
> --backing-store=/dev/sg3 --bstype=sg --device-type=tape
>
> ... having patched tgtadm 1.0.6 a bit to allow it to pass that device
> type, but a probe from the initiator seemed to make tgtd crash.
>
> Is this actually possible yet, and if so, are there prerequisites in
> terms of the kernel version and code version etc.? I couldn't find any
> reference to this in the documentation for 1.0.6, and I couldn't see a
> way to get a list of supported bstypes or device-types from tgtadm
> either. There seemed to be more types in the code than the manual
> pages, so I just tried a few more or less at random (what's the
> different between a bsg and an sg? A quick look at the Linux kernel
> headers didn't even seem to illuminate this)...
>
> In the meantime, I have things working using scst, but I'd prefer to go
> back to stgt if I can, as that's what I've used elsewhere (in addition
> to not requiring out-of-tree code which asks you to do weird stuff in
> /proc/).
>
> Cheers,
>
> Tim.
>
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