[pve-devel] scsihw / hotplug integration into GUI
aderumier at odiso.com
Mon Aug 13 13:08:12 CEST 2012
>>OK so scsi-generic can't work before ;-) But then we can do
>>autodetection. If somebody has scsihw: virtio-scsi-pci the scsi-generic
>>should be available.
I think scsi-generic can work with lsi controller. (but does it improve performance ?)
>>I can't get that running as i don't know how to pass the open-iscsi
>>device to the guest.
>>as virtio-scsi-pci is supported in guest since 3.4 wouldn't it make
>>sense to change scsi-hd to scsi-generic for all guests where scsihw is
>>set to virtio-scsi-pci and the host stgt interface is recent enough?
that's what I think.
virtio-scsi-pci + libiscsi + kvm1.2 : scsi-generic
virtio-scsi-pci + open-iscsi (host) + kvm1.2 : scsi-generic or scsi-block ?
----- Mail original -----
De: "Stefan Priebe - Profihost AG" <s.priebe at profihost.ag>
À: "Alexandre DERUMIER" <aderumier at odiso.com>
Cc: "Dietmar Maurer" <dietmar at proxmox.com>, pve-devel at pve.proxmox.com
Envoyé: Lundi 13 Août 2012 12:42:34
Objet: Re: [pve-devel] scsihw / hotplug integration into GUI
Am 13.08.2012 12:19, schrieb Alexandre DERUMIER:
>>> But scsi-block needs at least the following patch as it misses some
>>> implemtations. Otherwise you can't start a hd with scsi-block.
> (yes, I want to said when qemu-kvm 1.2 will be release)
>> - but scsi-generic seem faster (but need guest 3.4 ?)
>>> Will check / recheck this.
> In fact, virtio-scsi drivers are only available since kernel 3.4.
OK so scsi-generic can't work before ;-) But then we can do
autodetection. If somebody has scsihw: virtio-scsi-pci the scsi-generic
should be available.
> Can you try:
> lsi controller + libiscsi + scsi-generic vs scsi-block
> lsi controller + open-scsi (host) + scsi-generic vs scsi-block
NO real difference lsi is always SLOW (around 2000-5000 max iops)
> virtio-scsi controller + libiscsi + scsi generic vs scsi-block
scsi-block is the same performance as scsi-hd (maxed 20.000 iops) vs.
50.000 iops with scsi-generic.
> virtio-scsi controller + open-scsi (host) + scsi-generic vs scsi-block
I can't get that running as i don't know how to pass the open-iscsi
device to the guest.
Alexandre D e rumier
Ingénieur Systèmes et Réseaux
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