linux-kernel - Re: [PATCH] aic94xx: Use request_firmware() to provide SAS address if the adapter lacks one

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Date:	Wed, 10 Oct 2007 12:38:42 -0700 (PDT)
From:	Luben Tuikov <ltuikov@...oo.com>
To:	James.Smart@...lex.Com, "Darrick J. Wong" <djwong@...ibm.com>
Cc:	Andrew Vasquez <andrew.vasquez@...gic.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alexis Bruemmer <alexisb@...ibm.com>,
	James Bottomley <james.bottomley@...eleye.com>
Subject: Re: [PATCH] aic94xx: Use request_firmware() to provide SAS address if the adapter lacks one

--- James Smart <James.Smart@...lex.Com> wrote:
> Here's one pro for setting WWNs at arbitrary times...
>    If the box is migrating applications (say containers) that want
>    different SAN connectivity, where that connectivity (view) is based
>    on their WWN, it would be really nice to selectively set the WWN and
>    not touch the SAN config.

No.  The WWN stays the same and the SAN is re-configured to be
aware of the node migration.  Access patterns could be more
complex than just a single portal allowing access to/from the
SAN from/to the node.

WWN is supposed to be persistent.  This is what it actually is.
It is NOT supposed to be "(auto)generated" and/or changed at a whim.

This also has security implications, and enterprise networks may
refuse to use software (read "kernel") which allows for arbitrary
changes to a node's WWN.

If access to a node is compromised, a rogue agent may change
the node's WWN in order to access SAN zones that it normally
will be denied access to.

    Luben

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