Questions on SCSI Stream Commands

Kaul, Ram Krishan ram.krishan.kaul at hp.com
Thu Aug 12 08:35:29 PDT 2004


* From the T10 Reflector (t10 at t10.org), posted by:
* "Kaul, Ram Krishan" <ram.krishan.kaul at hp.com>
*
Shenwu,
	  You can use hpfcs691 until noon today. It has the array
connected. Later I will connect it to hpfcs690 for you.

Regards,
kaul

Ram K. Kaul
FC/SAS/EFI Drivers
SISL(EUD), Cupertino.
408-447-2829 

-----Original Message-----
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of David
Peterson (Eng)
Sent: Thursday, August 12, 2004 7:10 AM
To: Burn Alting; t10 at t10.org
Subject: RE: Questions on SCSI Stream Commands


* From the T10 Reflector (t10 at t10.org), posted by:
* "David Peterson \(Eng\)" <david_peterson at cnt.com>
*
Howdy Burn,

Definitions/text from the SSC-3 draft standard, same stuff is in the
SSC-2 standard:)

3.1.38 logical object: A logical block or a mark (see 4.2.5).

3.1.34 logical block: A logical object that is a unit of data supplied
or requested by an application client.

3.1.44 mark: A logical object that does not contain any initiator
defined data. A mark is either a setmark or filemark.

Per subclause 4.2.5:

Each logical object shall have a logical object identifier that is
unique within a partition.

The logical object identifier value shall be a sequentially increasing
number assigned to each logical object recorded in the partition
starting with zero for the recorded logical object at BOP.

Your Logical Object Identifier math below is correct until "M+Nth
logical block	M + N - 1"

...Dave

-----Original Message-----
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Burn
Alting
Sent: Wednesday, August 11, 2004 8:58 PM
To: t10 at t10.org
Subject: Questions on SCSI Stream Commands

* From the T10 Reflector (t10 at t10.org), posted by:
* Burn Alting <burn at goldweb.com.au>
*
Hi Peoples,

I've just finished reading the SCSI Stream Commands draft Rev 01a, dated
29 June 2004.

I have some questions.

Is a logical block a logical object?

If so, if I were to, at the start of a partition, write M logical
blocks,a filemark, then N logical blocks and finally a second filemark
would the logical object identifiers be as per this table?

                                Logical Object
                                Identifier
	BOP			
	first logical block	0
	second logical block	1
	third logical block	2
	...
	Mth logical block	M - 1

	first filemark		M

	M+1th logical block	M + 1
	M+2th logical block	M + 2
	...
	M+Nth logical block	M + N - 1

	second filemark		M + N
	

Thanks in advance.

Burn Alting


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