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Re: [Qemu-devel] Strange/wrong behavior with iSCSI Tape devices in QEMU


From: John Snow
Subject: Re: [Qemu-devel] Strange/wrong behavior with iSCSI Tape devices in QEMU 2.8.0-rc4
Date: Mon, 19 Dec 2016 12:30:02 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1


On 12/19/2016 04:05 AM, Holger Schranz wrote:
> # 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
> 

Hi, thanks for the report; do you have a QEMU command line that we can
use to help reproduce the problem? It's easiest if we can cut libvirt
out of the loop.

What is the architecture and version of the guest?

Lastly, it looks like this worked in our 2.7 release if I'm reading you
correctly, so this is a change for the 2.8 release as far as you can
tell, right?

--js

> =====================================================================
> 
> 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:~ #
> 



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