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

Dietmar Maurer dietmar at proxmox.com
Fri Sep 30 08:18:35 CEST 2016


> >>@Alexandre: This was for performance reasons?
> 
> yes, I think. (don't remember exactly).
> see the original post from stefan
> 
> http://pve.proxmox.com/pipermail/pve-devel/2012-August/003347.html
> 
> "Hello list,
> 
> right now when you select SCSI proxmox always use scsi-hd for device. 
> With virtio-scsi-pci as scsihw we can also select scsi-block or 
> scsi-generic.
> 
> With scsi-block and scsi-generic you can bypass qemu scsi emulation and 
> use trim / discard support as the guest can talk directly to the 
> underlying storage.
> 
> Also scsi-generic (needs guest kernel 3.4) is a lot faster then scsi-hd 
> or scsi-block.

This is not really true - seems scsi-block and scsi-generic are quite same
speed.



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