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From: Stefan Richter <stefanr@s5r6.in-berlin.de>
To: Grant Grundler <grundler@google.com>
Cc: Jeff Garzik <jeff@garzik.org>,
	linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] libata: rewrite SCSI host scheme to be one per ATA host
Date: Fri, 24 Apr 2009 13:00:49 +0200	[thread overview]
Message-ID: <49F19BE1.6030104@s5r6.in-berlin.de> (raw)
In-Reply-To: <da824cf30904221208l42e41d38g5af52b1b3b5ea9a1@mail.gmail.com>

Grant Grundler wrote:
> Data Center
> environments (not just Google's) like to track disks in many different
> ways, including the SCSI identifiers since this one "key" for physical
> location. Breaking the current mappings is going to cause some people
> a world of pain

If by SCSI identifiers you mean the Linux SCSI core's h:c:i:l, then
remember that these are scsi-core internal artifacts without any meaning
to lower and upper layers whatsoever, including userspace.  (Exception:
 The c:i:l part has some significance with SCSI Parallel Interface
attached hardware.)

> since they will need to manually build (and integrate)
> old->new maps of the SCSI identifiers.

Stock udev already provides mapping according to actually useful
identifiers (if the respective transport provides them: persistent and
unique identifiers of targets and logical units).
-- 
Stefan Richter
-=====-==--= -=-- ==---
http://arcgraph.de/sr/

      parent reply	other threads:[~2009-04-24 11:00 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-04-22  9:09 [PATCH] libata: rewrite SCSI host scheme to be one per ATA host Jeff Garzik
2009-04-22  9:23 ` Jeff Garzik
2009-04-22 12:16   ` Boaz Harrosh
2009-04-22 15:10     ` Daniela Engert
2009-04-22 15:18       ` Alan Cox
2009-04-22 15:37         ` James Bottomley
2009-04-22 16:27           ` Alan Cox
2009-04-22 18:36           ` Jeff Garzik
2009-04-22 19:27             ` James Bottomley
2009-04-22 16:48     ` Jeff Garzik
2009-04-23  6:35   ` Jens Axboe
2009-04-23 10:39     ` Jeff Garzik
2009-04-23 10:43       ` Jens Axboe
2009-04-22 13:09 ` Mark Lord
2009-04-22 16:52   ` Jeff Garzik
2009-04-22 19:08 ` Grant Grundler
2009-04-23 11:00   ` Jeff Garzik
2009-04-23 17:59     ` Grant Grundler
2009-04-23 18:09       ` James Bottomley
2009-04-24 11:00   ` Stefan Richter [this message]

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