[stgt] Using opensolaris as iscsi initiator for stgt

[Albert Pauw]

This could be handy info for some. The target is set up on linux with stgt,
the initiator is on opensolaris.

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 (virtual tape library) 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 at 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 at 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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