Re: iSCSI: Byte1 Bit 7 Seems Not to be reserved

["Julian Satran" <Julian_Satran@il.ibm.com>]

OK - to the todo bucket - julo

John Hufferd@IBMUS 15-12-01 01:54

To:        Julian Satran/Haifa/IBM@IBMIL         cc:        ips@ece.cmu.edu         Subject:        Re: iSCSI: Byte1 Bit 7 Seems Not to be reservedLink

But, this is the only place that we say a bit setting is set to 1 and is also marked as reserved.  I think it would be easier, to just update the documentation to not say it is reserved.  We have lots of other bits set to 1 always, that we do not call reserved.  

I think the only other place we have ones in a reserved field is the places where we set word fields to 0xFFFFFFFF.  And this is where the filed is so marked because a setting of zero has another semantic.  I do not think that applies to this bit, best to just update the document and not claim it to be reserved.

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John L. Hufferd
Senior Technical Staff Member (STSM)
IBM/SSG San Jose Ca
Main Office (408) 256-0403, Tie: 276-0403,  eFax: (408) 904-4688
Home Office (408) 997-6136, Cell: (408) 499-9702
Internet address: hufferd@us.ibm.com

Sent by:        owner-ips@ece.cmu.edu

To:        ips@ece.cmu.edu
cc:        
Subject:        Re: iSCSI: Byte1 Bit 7 Seems Not to be reserved




John,

If you are referring to the fact that a reserved bit has to be 0 - that is not so.
The statement about reserved is that they are 0 unless explicitly said otherwise.
There are some other reserved positions that are set to 1.  

Julo

John Hufferd@IBMUS 14-12-01 10:24

To:        Julian Satran/Haifa/IBM@IBMIL@IBMDE         cc:        ips@ece.cmu.edu         Subject:        iSCSI: Byte1 Bit 7 Seems Not to be reserved

Julian, 
in Draft 9, the SCSI Response PDU picture shows Byte 1 Bit 7 (normally the Final Flag) to be set to 1.  Yet the Text that follows the picture says that Byte 1 Bit 7 -5 is reserved.  We should probably make those consistent.   I think you meant to indicate that the Response was the only PDU associated with this action, so I think you need to mark only Byte 1 bit 6-5 as reserved.

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John L. Hufferd
Senior Technical Staff Member (STSM)
IBM/SSG San Jose Ca
Main Office (408) 256-0403, Tie: 276-0403,  eFax: (408) 904-4688
Home Office (408) 997-6136, Cell: (408) 499-9702
Internet address: hufferd@us.ibm.com