Re: Oracle RAC in libvirt+KVM environment

[Paolo Bonzini <pbonzini@redhat.com>]

Il 20/08/2013 12:42, Timon Wang ha scritto:
> [root@localhost /]# ls -l /dev/VM-IMAGES-BACKUP-DO-NOT-REMOVE/q_disk
> lrwxrwxrwx. 1 root root 8 8月  20 17:38
> /dev/VM-IMAGES-BACKUP-DO-NOT-REMOVE/q_disk -> ../dm-13
> [root@localhost /]# sg_inq /dev/VM-IMAGES-BACKUP-DO-NOT-REMOVE/q_disk
> standard INQUIRY:
>   PQual=0  Device_type=0  RMB=0  version=0x05  [SPC-3]
>   [AERC=0]  [TrmTsk=0]  NormACA=0  HiSUP=0  Resp_data_format=0
>   SCCS=1  ACC=0  TPGS=1  3PC=0  Protect=0  [BQue=0]
>   EncServ=0  MultiP=0  [MChngr=0]  [ACKREQQ=0]  Addr16=0
>   [RelAdr=0]  WBus16=1  Sync=1  Linked=0  [TranDis=0]  CmdQue=1
>     length=36 (0x24)   Peripheral device type: disk
>  Vendor identification: MacroSAN
>  Product identification: LU
>  Product revision level: 1.0
>  Unit serial number: 0d9281ae-aea4-6da0-0000-02180142b300
> 
> This lun is from a vg build based on iscsi target.

If it is a logical volume, you cannot pass it as a LUN to the guest.
Only the whole iSCSI LUN can be passed as a LUN.

Paolo

> [root@localhost /]# libvirtd --version
> libvirtd (libvirt) 1.0.5
> [root@localhost /]# qemu-kvm --version
> QEMU emulator version 1.4.1, Copyright (c) 2003-2008 Fabrice Bellard
> [root@localhost /]# uname -a
> Linux localhost.localdomain 3.9.2-301.fc19.x86_64 #1 SMP Mon May 13
> 12:36:24 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
> 
> 
> On Tue, Aug 20, 2013 at 6:16 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>> Il 20/08/2013 11:59, Timon Wang ha scritto:
>>> On Tue, Aug 20, 2013 at 4:33 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>>>> Il 20/08/2013 08:00, Timon Wang ha scritto:
>>>>>     <disk type='file' device='disk'>
>>>>>       <driver name='qemu' type='raw' cache='none'/>
>>>>>       <source file='/home/images/win2008_2_sys'/>
>>>>>       <target dev='hda' bus='ide'/>
>>>>>       <boot order='3'/>
>>>>>       <address type='drive' controller='0' bus='0' target='0' unit='0'/>
>>>>>     </disk>
>>>>>     <disk type='file' device='cdrom'>
>>>>>       <driver name='qemu' type='raw'/>
>>>>>       <source file='/home/isos/windows2008_64r2.iso'/>
>>>>>       <target dev='sdc' bus='ide'/>
>>>>>       <readonly/>
>>>>>       <boot order='1'/>
>>>>>       <address type='drive' controller='0' bus='1' target='0' unit='0'/>
>>>>>     </disk>
>>>>>     <disk type='block' device='disk'>
>>>>
>>>> I'm not sure this will be enough, but if you want passthrough to the
>>>> host device you should use device='lun' here.  However, you still would
>>>> not be able to issue SCSI reservations unless you run QEMU with the
>>>> CAP_SYS_RAWIO capability (using "<disk ... rawio='yes'>").
>>>>
>>>
>>> After change the libvirt xml like this:
>>> <disk type='block' device='lun' rawio='yes'>
>>>       <driver name='qemu' type='raw' cache='none'/>
>>>       <source dev='/dev/VM-IMAGES-BACKUP-DO-NOT-REMOVE/q_disk'/>
>>>       <target dev='sda' bus='scsi'/>
>>>       <shareable/>
>>>       <address type='drive' controller='0' bus='0' target='0' unit='0'/>
>>>     </disk>
>>> I got these errors:
>>> char device redirected to /dev/pts/1 (label charserial0)
>>> qemu-system-x86_64: -device
>>> scsi-block,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0:
>>> scsi-block: INQUIRY failed
>>> qemu-system-x86_64: -device
>>> scsi-block,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0:
>>> Device 'scsi-block' could not be initialized
>>
>> Can you do
>>
>> # ls -l /dev/VM-IMAGES-BACKUP-DO-NOT-REMOVE/q_disk
>> # sg_inq /dev/VM-IMAGES-BACKUP-DO-NOT-REMOVE/q_disk
>>
>> ?
>>
>> Paolo
>>
> 
> 
>