linux-kernel - RE: HP (Compaq) Smart Array 5xxx controller SCSI driver

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Date:	Thu, 24 Jul 2008 13:47:48 -0400
From:	Andrew Patterson <andrew.patterson@...com>
To:	"Miller, Mike (OS Dev)" <Mike.Miller@...com>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	"scameron@...rdog.cca.cpqcorp.net" <scameron@...rdog.cca.cpqcorp.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: HP (Compaq) Smart Array 5xxx controller SCSI driver

On Thu, 2008-07-24 at 15:00 +0000, Miller, Mike (OS Dev) wrote:
> > > As for the patches I mentioned which were previously ignored for
> > > improving how the current cciss SCSI code handled hot plogging, if
> > > you're curious about that, check here:
> > >
> > > http://marc.info/?l=linux-scsi&m=120213565000426&w=4
> > >
> > > A change like that becomes more important if logical drives are
> > > exposed through the scsi layer.
> >
> > We need to think about the best way to map (expose) logical
> > and physical drivers to SCSI luns. As I wrote before, I'm
> > interested in how HP SCSI driver does.
> 
> We don't neccesarily want or need to expose the physical disks. The
> only exception is disks that are not part of a logical volume. If the
> disks are part of a logical volume but exposed the user may shoot
> themselves in the foot by destroying the firmware metadata.

Exposing the underlying disks can be useful for things such as:

      * Finding out what is in a logical drive.
      * Checking and updating disk firmware.
      * Running smartctrl tests on disks

> -- mikem
> --
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> 
-- 
Andrew Patterson
Hewlett-Packard

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