Re: [Xen-devel] [RFC] [0/4] PV driver for FC transport layer

[Jun Kamada <kama@xxxxxxxxxxxxxx>]

Fujita-san,

I'm sorry if following may not be a straight answer for your question.

Please imagine a large IDC. In general, some guest domain groups, which
have different storage managemnt policy, exist in the IDC. And, the each
domain group would like to have own storage management software within
the guest domain group.

We consider that the management software requires at least following
function to platform the software is running on.

- inform whether the currently focussed storage device or HBA is pure
  SCSI or FC-SCSI.
- if FC-SCSI, inform FC attributes such as WWN to the software.

According to the information aquired, the storage managemant software
can control bindings of the storage and the HBA.


Thanks,

On Fri, 06 Jul 2007 16:26:11 +0900
FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> wrote:

> From: Jun Kamada <kama@xxxxxxxxxxxxxx>
> Subject: Re: [Xen-devel] [RFC] [0/4] PV driver for FC transport layer
> Date: Fri, 06 Jul 2007 15:44:16 +0900
> 
> > Hi, Fujita-san,
> > 
> > On Fri, 06 Jul 2007 09:22:15 +0900
> > FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> wrote:
> > > > We are planning to run a storage management software, which controls
> > > > bindings storages on FC network to hosts, on group of guest domains.
> > > > The software expect that each guest domain has each HBA, and control the
> > > > HBA directly. (Ex. resetting SCSI bus and getting WWN, ...)
> > > 
> > > How do you support storage management software that uses non-scsi?
> > 
> > Current our scope is only SCSI on FC.
> > What do you mean as the "non-scsi" ?
> 
> James Smart also asked you guys about this at the previous submission:
> 
> http://lists.xensource.com/archives/html/xen-devel/2007-05/msg00689.html
> 
> ---
> > We want to use SAN management software on guest OS. The software
> > works on native(no VM) linux. So we think it is necesarry to 
> > have guest OS shown whether HBA card is FC or SCSI in the same
> > way of native linux.
> 
> Well - depends on what/how your san mgmt works. If it's straight scsi,
> then it would be fine - but you can't talk to anything non-scsi and
> not enumerated by the hba.  If it's layered on hbaapi, it does mean
> you want to talk FC, not just scsi, and now things change significantly.

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



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