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Re: [libvirt] [PATCH 0/1] Merge DanPB's SCSI HBA pool code



On Mon, Feb 23, 2009 at 07:53:07PM +0000, Daniel P. Berrange wrote:
> On Mon, Feb 23, 2009 at 06:03:07PM +0100, Guido G?nther wrote:
> > On Fri, Feb 20, 2009 at 05:14:54PM -0500, David Allan wrote:
> > > This patch contains the implementation Daniel Berrange did of storage
> > > pools using SCSI HBAs.  I have updated it for the current tree in
> > > preparation for implementing NPIV support.  Let me know what you
> > > think.
> > This looks like a great addition but I wonder if it is of any real use
> > without supporting multipath? On SANs issuing I/O to some paths might
> > cause severe performance penalties or the LUN might be visible but I/O
> > is rejected until an explicit switch over command is sent. This would be
> > handled transparently if multipath would be used on top.
> 
> This is *not* just for FibreChannel based HBAs. Even single host SATA
Sure.
> controllers show up as SCSI HBAs, so its perfectly usable even in that
> case. So there's no need to block on multipath support
It's just that using it on fibre based HBAs could cause trouble so
thought I'd ask.
 -- Guido


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