Re: [libvirt-users] Ang: Re: Ang: Re: attaching storage pool error

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. > > > > So anyone that can point me further....? > > http://libvirt.org/formatstorage.html > https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/... > > Hope it can help you to get start with it. > > > Unfortunatly I have already gone through these documents, several times as > well, but these are only about the creation of storage pools, not how you > attach them to the guest. If the pool is ready, here are kinds of examples http://libvirt.org/formatdomain.html#elementsDisks you can use it in guest like this:     <disk type='volume' device='disk'>       <driver name='qemu' type='raw'/>       <source pool='iscsi-pool' volume='unit:0:0:1' mode='host'/>       <auth username='myuser'>         <secret type='iscsi' usage='libvirtiscsi'/>       </auth>       <target dev='vdb' bus='virtio'/>     </disk> 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...?

A couple of additional questions here: * Since the target device is already defined in the pool, I don't see the reason for defining it here as well, like in your example with the iscsi pool? * I'd like to use virtio-scsi combined with the pool, is that possible? * If so, how do I define that? I understand I can define a controller separatly, but how do I tell the guest to use that specific controller in combination with that pool?

* Since the npiv pool obviously is a pool based on an fc initiator, the fc target can/will provision more lun's to that initiator, how will that effect the pool and the guest's access to new lun's? In this example the volume says 'unit:0:0:1', and I guess that will change if there will be more lun's in there? Or is that "volume unit" the "scsi target device", and can hold multiple lun's?

Regards Johan > > > > > Rgrds Johan > > > > > > _______________________________________________ > > libvirt-users mailing list > > libvirt-users(a)redhat.com > > https://www.redhat.com/mailman/listinfo/libvirt-users > > > > > > > > > > _______________________________________________ libvirt-users mailing list libvirt-users(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users