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

[Michael Rasmussen]

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.

-- 
Hilsen/Regards
Michael Rasmussen

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