[pve-devel] scsihw / hotplug integration into GUI

[Alexandre DERUMIER]

>>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. 
file=/dev/sdXXX


>>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. 

Stefan 



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