[pve-devel] integration of scsi-hd, scsi-block, scsi-generic

Alexandre DERUMIER aderumier at odiso.com
Sun Aug 12 11:05:31 CEST 2012


I have tested both, thet don't works with kvm 1.1

scsi-block 


kvm: -device scsi-block,bus=scsihw0.0,scsi-id=0,drive=drive-scsi0,id=scsi0: scsi-block: scsi generic interface too old 
kvm: -device scsi-block,bus=scsihw0.0,scsi-id=0,drive=drive-scsi0,id=scsi0: Device 'scsi-block' could not be initialized 


scsi-generic 

kvm: -device scsi-generic,bus=scsihw0.0,scsi-id=0,drive=drive-scsi0,id=scsi0: not /dev/sg* 
kvm: -device scsi-generic,bus=scsihw0.0,scsi-id=0,drive=drive-scsi0,id=scsi0: Device 'scsi-generic' could not be initialized 




> about scsi-generic, what happen is the guest has a kernel < 3.4 ? 
Haven't tested but as virtio-scsi-pci was introduced in 3.2 anyway i 
won't care much about older kernels. What do you thik? (i mean 3.4 is 
not far away from 3.2) 

Yes I think we can put scsi-generic as default when using libiscsi, but we need to wait for kvm 1.2 (should come in 1 or 2 month)

If you really need it , you can hack /usr/share/perl5/PVE/QemuServer.pm, sub print_drivedevice_full , my $devicetype = 'hd' -> generic.



----- Mail original -----

De: "Stefan Priebe" <s.priebe at profihost.ag> 
À: "Alexandre DERUMIER" <aderumier at odiso.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Dimanche 12 Août 2012 10:14:17 
Objet: Re: [pve-devel] integration of scsi-hd, scsi-block, scsi-generic 

Am 12.08.2012 01:27, schrieb Alexandre DERUMIER: 
>>> Also scsi-generic (needs guest kernel 3.4) is a lot faster then scsi-hd 
>>> or scsi-block. 
> 
> does scsi-block works with libiscsi with kvm 1.1 ? (so we can select it by default is we use libiscsi) 
scsi-block does not even work with current ;-) qemu.git as there is a 
bug. But it will be fixed for qemu 1.2. But anyway scsi-generic is much 
more interesting. It's a lot faster. 

> about scsi-generic, what happen is the guest has a kernel < 3.4 ? 
Haven't tested but as virtio-scsi-pci was introduced in 3.2 anyway i 
won't care much about older kernels. What do you thik? (i mean 3.4 is 
not far away from 3.2) 

Greets, 
Stefan 



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Alexandre D e rumier 

Ingénieur Systèmes et Réseaux 


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