Re: Few basic doubts

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

owner-ips@ece.cmu.edu wrote on 13-12-2001 22:42:41:

> Hi all,
> I am just a beginner in iSCSI. I have gone through
> draft-ietf-ips-iscsi-09.txt.
> I have few basic doubts. I am very thankful if some one clarifies those.
> I am listing them.
> 
> 1) Data segment length in the BHS is not including the padding
>    bytes how to reach the end of PDU.
>    is it only padded to the nearest integer multiple of 4?
>    Can we assume like pad can be maximum of 3?
>    @3.2.1.5
> 
> 2) Digests are not included in data or header length fields
>    How do we know Digest is present or not?
>    @3.2.3
>    During Login Negotiation PDU where Digest is negotiated What will be the
> digest?
> 
pad bytes are not included in the length (there must be a way to convey the real length) and there are maximum 3 bytes of padding (minimum neede to reach a multiple of 4)
 
> 3) In ISCSI Command format both W and F setting to 0
>    is an error.

+++ yes it is an error +++
>    Read command(R=1) but further reads can follow is not valid?
>    @ 3.3.1
??? what is the question ???
> 
> 4) If the Initiator Sent less than FirstBurstSize( negotiated 
>    maximum amount of unsolicated Data the target will accept)
>    Why it is an error? 
>    Sending Maximum than allowed can be an error but sending lesser
>    than allowed how it can be an error?
>    @ 3.3.5

It may negatively affect performance of targets that send R2T immediately after seeing the command an not waiting to see the F=1 for unsolicited - to "beat" the turnaround time.
> 
> 5) Residual overflow error why it has kept target can read more
>    and give only what the initiator is requesting.
>    @ 3.4.1
> 
> 
> Pratima
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