5:43 a.m.
Hi!
-----Yuan Dan <dyuan(a)redhat.com> skrev: -----
Till: Johan Kragsterman <johan.kragsterman(a)capvert.se>
Från: Yuan Dan <dyuan(a)redhat.com>
Datum: 2016-08-24 10:22
Kopia: libvirt-users(a)redhat.com
Ärende: Re: [libvirt-users] Ang: Re: Ang: Re: attaching storage pool error
----- Original Message -----
Hi and thanks for your important input,Dan!
> >
> >
> > System centos7, system default libvirt version.
> >
> > I've succeeded to create an npiv storage pool, which I could start
> > without
> > problems. Though I couldn't attach it to the vm, it throwed errors when
> > trying. I want to boot from it, so I need it working from start. I read
> > one
> > of Daniel Berrange's old(2010) blogs about attaching an iScsi pool, and
> > draw
> > my conclusions from that. Other documentation I haven't found. Someone
> > can
> > point me to a more recent documentation of this?
> >
> > Are there other mailing list in the libvirt/KVM communities that are more
> > focused on storage? I'd like to know about these, if so, since I'm a
> > storage
> > guy, and fiddle around a lot with these things...
> >
> > There are quite a few things I'd like to know about, that I doubt this
> > list
> > cares about, or have knowledge about, like multipath devices/pools,
> > virtio-scsi in combination with npiv-storagepool, etc.
As I described above, I created an npiv pool for my FC backend. I'd also like
to get scsi pass through, which seems to be possible only if I use
"device=lun". Can I NOT use "device=lun", and then obviously NOT get
"scsi
pass through", if I use an npiv storage pool? Is the only way to get "scsi
pass through" to NOT use a storage pool, but instead use the host lun's?
What do you think about this?:
<disk type='volume' device='disk'>
<driver name='qemu' type='raw'/>
<source pool='vhbapool_host8' volume='unit:0:0:1'/>
<target dev='hda' bus='ide'/>
</disk>
But I'd prefer to be able to use something like this instead:
<disk type='volume' device='lun'>
<driver name='qemu' type='raw'/>
<source pool='vhbapool_host8' volume='unit:0:0:1'/>
<target dev='vda' bus='scsi'/>
</disk>
But that might not be possible...?
No need to prepare the pool for the following 2 usage.
Is it satisfied your requirement ?
http://libvirt.org/formatdomain.html#elementsHostDevSubsys
<hostdev mode='subsystem' type='scsi'>
<source>
<adapter name='scsi_host0'/>
<address bus='0' target='0' unit='0'/>
</source>
<readonly/>
<address type='drive' controller='0' bus='0'
target='0' unit='0'/>
</hostdev>
<disk type='block' device='disk'>
<driver name='qemu' type='raw'/>
<source
dev='/dev/disk/by-path/pci-0000\:04\:00.1-fc-0x203400a0b85ad1d7-lun-0'/>
<target dev='sda' bus='scsi'/>
</disk>
Ahh, the "<hostdev mode='subsystem' type='scsi'>", I
didn't understand that possibility until now...hmmm, seems useful. Does that include
the multipath ability, as I mentioned in my previous mail?
And if so, how would I handle it in the guest? Seems impossible le to use:
"<target dev='sda' bus='scsi'/>"
Regards Johan
Thanks
Dan
Regards Johan
>
> >
> > Rgrds Johan
> >
> >
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> >
> >
> >
>
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