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



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
controllers show up as SCSI HBAs, so its perfectly usable even in that
case. So there's no need to block on multipath support

Daniel
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