[Qemu-devel] Strange/wrong behavior with iSCSI Tape devices in QEMU 2.8.0-rc4

[Holger Schranz]

# Strange/wrong behavior in QEMU 2.8.0-rc4

After update from QEMU 2.6.2 to 2.8.0-rc4 the tape devices
and the corresponding medium changer are no longer available
in the VM quest system.

The tape devices and the media changer are declared in the
xml-file for libvirt. Both, tape drives and medium changer
are avalilable via iSCSI.

In a first rough investigation the login in iSCSI runs well
but in QEMU, it seems the devices doesn't reported to the VM-Quest.

------------------

Best regards

Holger

=====================================================================

XML-Declration:

.
.
.

<!-- SCSI 2 -->
    <controller type='scsi' model='virtio-scsi' index='1'>
      <alias name='scsi1'/>
    </controller>

<!-- 2 x LTO5 -->
    <hostdev mode='subsystem' type='scsi' managed='no' rawio='yes'>
      <source protocol='iscsi' 
name='iqn.2008-09.net.fsc:server.LT260_61003/4'>
      <host name='etcsvms2.abg.fsc.net' port='3260'/>
      </source>
      <address type='drive' controller='1' bus='0' target='2' unit='1'/>
    </hostdev>

    <hostdev mode='subsystem' type='scsi' managed='no' rawio='yes'>
      <source protocol='iscsi' 
name='iqn.2008-09.net.fsc:server.LT260_61003/5'>
      <host name='etcsvms2.abg.fsc.net' port='3260'/>
      </source>
      <address type='drive' controller='1' bus='0' target='2' unit='2'/>
    </hostdev>

<!-- Virtual media changer Fujitsu LT260 -->
    <hostdev mode='subsystem' type='scsi' managed='no' rawio='yes'>
      <source protocol='iscsi' 
name='iqn.2008-09.net.fsc:server.LT260_61003/6'>
      <host name='etcsvms2.abg.fsc.net' port='3260'/>
      </source>
      <address type='drive' controller='1' bus='0' target='2' unit='3'/>
    </hostdev>

<!-- 2 x LTO6 (via PLP(LAN-attached library)) -->
    <hostdev mode='subsystem' type='scsi' managed='no' rawio='yes'>
      <source protocol='iscsi' 
name='iqn.2008-09.net.fsc:server.LT60_61005/3'>
      <host name='etcsvms2.abg.fsc.net' port='3260'/>
      </source>
      <address type='drive' controller='1' bus='0' target='2' unit='4'/>
    </hostdev>

    <hostdev mode='subsystem' type='scsi' managed='no' rawio='yes'>
      <source protocol='iscsi' 
name='iqn.2008-09.net.fsc:server.LT60_61005/4'>
      <host name='etcsvms2.abg.fsc.net' port='3260'/>
      </source>
      <address type='drive' controller='1' bus='0' target='2' unit='5'/>
    </hostdev>
.
.
.

===============================================================================

correct behavior/Result inside the VM-Quest together with QEMU/KVM 2.6.2 
/ 2.7.0
--
(VCSTCS82:A)IUP1:~ # lsscsi -g
[0:2:0:0]    disk    FTS      PRAID EP420i     4.25  /dev/sda /dev/sg0
[3:0:0:0]    cd/dvd  QEMU     QEMU DVD-ROM     2.5+  /dev/sr0 /dev/sg1
[8:0:2:1]    tape    HP       Ultrium 5-SCSI   0001  /dev/st3 /dev/sg6
[8:0:2:2]    tape    HP       Ultrium 5-SCSI   0001  /dev/st2 /dev/sg5
[8:0:2:3]    mediumx FUJITSU  ETERNUS LT260    6.20  - /dev/sg4
[8:0:2:4]    tape    HP       Ultrium 6-SCSI   23AB  /dev/st1 /dev/sg3
[8:0:2:5]    tape    HP       Ultrium 6-SCSI   23AB  /dev/st0 /dev/sg2
[11:0:0:0]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdb /dev/sg7
[11:0:0:2]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdh /dev/sg13
[11:0:0:3]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdg /dev/sg12
[11:0:0:4]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdf /dev/sg11
[11:0:0:5]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sde /dev/sg10
[11:0:0:6]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdd /dev/sg9
[11:0:0:7]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdc /dev/sg8
[11:0:0:15]  disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdi /dev/sg14
(VCSTCS82:A)IUP1:~ #



Wrong behavior/Result inside the VM-Quest together with QEMU/KVM 2.8.0-RC4
--
(VCSTCS82:A)IUP1:~ # lsscsi -g
[0:2:0:0]    disk    FTS      PRAID EP420i     4.25  /dev/sda /dev/sg0
[3:0:0:0]    cd/dvd  QEMU     QEMU DVD-ROM     2.5+  /dev/sr0 /dev/sg1
[11:0:1:0]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdj /dev/sg10
[11:0:1:2]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdp /dev/sg16
[11:0:1:3]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdo /dev/sg15
[11:0:1:4]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdn /dev/sg14
[11:0:1:5]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdm /dev/sg13
[11:0:1:6]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdl /dev/sg12
[11:0:1:7]   disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdk /dev/sg11
[11:0:1:15]  disk    FUJITSU  ETERNUS_DXL      0000  /dev/sdq /dev/sg17
(VCSTCS82:A)IUP1:~ #