Re: [Xen-devel] [PATCH 0/6] pvSCSI (SCSI pass through) driver

[Jun Kamada <kama@xxxxxxxxxxxxxx>]

Hi Stephen-san,

On Thu, 01 Nov 2007 12:14:41 +0000
"Stephen C. Tweedie" <sct@xxxxxxxxxx> wrote:
> On Tue, 2007-10-30 at 19:39 +0900, Jun Kamada wrote:
> 
> Is this using the same syntax for HBA reservation that we used to have,
> ie. simply enumerated using the scsi host number on the dom0?

Yes.

> If so, that is rather fragile.  The scsi host number can change from
> kernel to kernel depending on HBA driver probe order and PCI bus
> enumeration order.  It changes when hardware is rearranged.  And how do
> we deal with migrate, when we'll need to select a completely different
> HBA on a different host?
> 
> Selecting the HBA by scsi host number is good enough for a demonstration
> that the code works, but I don't think it's going to be robust enough
> for production deployment.  

We also recognize that more sophisticated interface is needed. WWPN can
be used for FC-SCSI, however pure SCSI does not have any unique ID.
Do you have any idea?

> Also, has there been any progress towards exposing individual LUNs to
> the guest rather than a whole HBA?
> 
> Cheers, 
>  Stephen
> 

Jun Kamada
Linux Technology Development Div.
Server Systems Unit
Fujitsu Ltd.
kama@xxxxxxxxxxxxxx



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