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From: Hannes Reinecke <hare@suse.de>
To: dgilbert@interlog.com, James Bottomley <jbottomley@parallels.com>
Cc: Christoph Hellwig <hch@infradead.org>, linux-scsi@vger.kernel.org
Subject: Re: [PATCH 1/2] Use sdev_scsi2lun for SCSI parallel drivers
Date: Mon, 07 Jul 2014 07:47:41 +0200	[thread overview]
Message-ID: <53BA347D.3020807@suse.de> (raw)
In-Reply-To: <53B70404.9080303@interlog.com>

On 07/04/2014 09:44 PM, Douglas Gilbert wrote:
> On 14-07-04 07:54 AM, Hannes Reinecke wrote:
>> SCSI-2 defines only up to 256 LUNs with a flat namespace.
>
> My SCSI-2 draft (revision 10b from August 1989) only has
> 3 bit LUNs placed in byte 1 of the command block, in the top
> 3 bits. There are also things called LUNTARs and LUNTRNs
> at the message level.
>
> 8 bit LUNs do ring a distant bell, perhaps after SCSI-2?
>
Yeah, you're right. SCSI-2 defines a 3-byte LUN; starting with SCSI-3 it 
went to 64bit.

I'll be renaming them to 'sdev_lun8'.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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  parent reply	other threads:[~2014-07-07  5:47 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-04 11:54 [PATCH 0/2] Fixed for 64bit LUNs Hannes Reinecke
2014-07-04 11:54 ` [PATCH 1/2] Use sdev_scsi2lun for SCSI parallel drivers Hannes Reinecke
2014-07-04 13:44   ` Christoph Hellwig
2014-07-04 14:12     ` Hannes Reinecke
2014-07-05  9:41       ` Christoph Hellwig
2014-07-07  7:54         ` Hannes Reinecke
2014-07-07  7:59           ` Hannes Reinecke
2014-07-07  9:37           ` Christoph Hellwig
2014-07-07 10:05             ` Hannes Reinecke
2014-07-07 10:11               ` Christoph Hellwig
2014-07-07 14:10                 ` Hannes Reinecke
2014-07-04 19:44   ` Douglas Gilbert
2014-07-04 20:14     ` Elliott, Robert (Server Storage)
2014-07-07  5:47     ` Hannes Reinecke [this message]
2014-07-04 11:54 ` [PATCH 2/2] ib_srp: 64bit LUN fixes Hannes Reinecke
2014-07-04 12:31   ` Bart Van Assche
2014-07-04 13:01     ` Hannes Reinecke
2014-07-04 13:48       ` Christoph Hellwig
2014-07-04 14:12         ` Hannes Reinecke
2014-07-04 14:38           ` Bart Van Assche
2014-07-04 14:41             ` Hannes Reinecke
2014-07-04 16:53               ` Bart Van Assche

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