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Introduction
-------------
The SSC emulation in TGTD can emulate tape drives by using files. This
virtualization technology is known as a virtual tape library (VTL).
Solaris tips
-------------
If one wants to get VTL working on a Solaris initiator (and this
target of course under Linux) then it is rather simple to get a tape
drive working. Getting the changer device working under Solaris
(OpenSolaris) take a bit more effort. This file describes the way to
do it.
Although most of it is probably well know to Solaris fans, it took me
a bit of time to figure out to get the VTL target working fine under
OpenSolaris. For those who want to give it a try, here are the
commands:
For normal disk and cd targets no files have to be changed. All you
need is the following:
# svcadm enable iscsi_initiator
and check if it is online:
# svcs iscsi_initiator
the state should be online.
Now we add the discovery address to the initiator:
# iscsiadm add discovery-address <IP of target>
Now we configure the discovery mode to sendtargets:
# iscsiadm modify discovery -t enable
Check the target:
# iscsiadm list target -S
And create the device files:
# devfsadm -i iscsi
Tape devices will be shown properly, but not the changer device, this
takes a bit more work. Two files need to be changed, and a reboot is
needed to set things up properly.
In the file /etc/driver_aliases the two lines
sgen "scsa,08.bfcp"
sgen "scsa,08.bvhci"
need to be replaced with
sgen "scsiclass,08"
The file /kernel/drv/sgen.conf, which is basically all commented out
needs to have the following lines:
device-type-config-list="changer","sequential";
inquiry-config-list= "*", "*";
name="sgen" class="scsi" target=0 lun=4;
name="sgen" class="scsi" target=1 lun=4;
name="sgen" class="scsi" target=2 lun=4;
name="sgen" class="scsi" target=3 lun=4;
name="sgen" class="scsi" target=4 lun=4;
name="sgen" class="scsi" target=5 lun=4;
name="sgen" class="scsi" target=6 lun=4;
name="sgen" class="scsi" target=7 lun=4;
name="sgen" class="scsi" target=8 lun=4;
name="sgen" class="scsi" target=9 lun=4;
name="sgen" class="scsi" target=10 lun=4;
name="sgen" class="scsi" target=11 lun=4;
name="sgen" class="scsi" target=12 lun=4;
name="sgen" class="scsi" target=13 lun=4;
name="sgen" class="scsi" target=14 lun=4;
name="sgen" class="scsi" target=15 lun=4;
For the last bit it should be noted that my changer was set to lun 4,
and since I don't know which target I put all target numbers in (0-15).
After these modifications the best is to reboot the machine, and do
the iscsi commands above, and he presto it works:
In my case, three tape drives and one changer:
root@solar:/kernel/drv# iscsiadm list target -S
Target: iqn.2008-09.com.example:server.tape
Alias: -
TPGT: 1
ISID: 4000002a0000
Connections: 1
LUN: 4
Vendor: STK
Product: L700
OS Device Name: /dev/scsi/changer/c0t0d0
LUN: 3
Vendor: HP
Product: LTO3 ULTRIUM
OS Device Name: /dev/rmt/2n
LUN: 2
Vendor: HP
Product: LTO3 ULTRIUM
OS Device Name: /dev/rmt/1n
LUN: 1
Vendor: HP
Product: LTO3 ULTRIUM
OS Device Name: /dev/rmt/0n
root@solar:/kernel/drv# mtx -f /dev/scsi/changer/c0t0d0 status
Storage Changer /dev/scsi/changer/c0t0d0:3 Drives, 29 Slots ( 5 Import/Export )
Data Transfer Element 0:Empty
Data Transfer Element 1:Empty
Data Transfer Element 2:Empty
Storage Element 1:Full :VolumeTag=A0000001
Storage Element 2:Full :VolumeTag=A0000002
Storage Element 3:Full :VolumeTag=A0000003
Storage Element 4:Full :VolumeTag=A0000004
Storage Element 5:Full :VolumeTag=A0000005
Storage Element 6:Full :VolumeTag=A0000006
Storage Element 7:Full :VolumeTag=A0000007
Storage Element 8:Full :VolumeTag=A0000008
Storage Element 9:Empty:VolumeTag=
Storage Element 10:Empty:VolumeTag=
Storage Element 11:Empty:VolumeTag=
Storage Element 12:Empty:VolumeTag=
Storage Element 13:Empty:VolumeTag=
Storage Element 14:Empty:VolumeTag=
Storage Element 15:Empty:VolumeTag=
Storage Element 16:Empty:VolumeTag=
Storage Element 17:Empty:VolumeTag=
Storage Element 18:Empty:VolumeTag=
Storage Element 19:Empty:VolumeTag=
Storage Element 20:Empty:VolumeTag=
Storage Element 21:Empty:VolumeTag=
Storage Element 22:Empty:VolumeTag=
Storage Element 23:Empty:VolumeTag=
Storage Element 24:Full :VolumeTag=CLN00001
Storage Element 25 IMPORT/EXPORT:Empty:VolumeTag=
Storage Element 26 IMPORT/EXPORT:Empty:VolumeTag=
Storage Element 27 IMPORT/EXPORT:Empty:VolumeTag=
Storage Element 28 IMPORT/EXPORT:Empty:VolumeTag=
Storage Element 29 IMPORT/EXPORT:Empty:VolumeTag=
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