[pve-devel] pve-manager and disk IO monitoring

[Alexandre DERUMIER]

>>To summe it all up. I think scsi-generic should be reserved for the
>>situations were you make pass-through of a HBA/RAID controller to a VM
>>or if device is either scsi-CD, scsi-tape, or scsi-backplane.

maybe could we add an option on scsihw ? scsihw:virtio-scsi,type=generic|block  ?

----- Mail original -----
De: "datanom.net" <mir at datanom.net>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Vendredi 30 Septembre 2016 08:48:51
Objet: Re: [pve-devel] pve-manager and disk IO monitoring

On Fri, 30 Sep 2016 07:50:11 +0200 (CEST) 
Dietmar Maurer <dietmar at proxmox.com> wrote: 

> > So my question is: Why use scsi-generic instead of scsi-block when 
> > scsi-generic prevents blockstats? 
> 
> commit d454d040338a6216c8d3e5cc9623d6223476cb5a 
> Author: Alexandre Derumier <aderumier at odiso.com> 
> Date: Tue Aug 28 12:46:07 2012 +0200 
> 
> use scsi-generic by default with libiscsi 
> 
> This add scsi passthrough with libiscsi 
> 
> Signed-off-by: Alexandre Derumier <aderumier at odiso.com> 
> 
> 
> @Alexandre: This was for performance reasons? 
> 
Remember, this is 4 years ago with many iterations and releases later. 
I could be at that time scsi-generic gave better performance but today 
the situation seems to have changed in favor of scsi-block? And as well 
as scsi-generic scsi-block likewise passes through scsi-unmap so trim 
also works with scsi-block. 

To summe it all up. I think scsi-generic should be reserved for the 
situations were you make pass-through of a HBA/RAID controller to a VM 
or if device is either scsi-CD, scsi-tape, or scsi-backplane. 

-- 
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Michael Rasmussen 

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