questions about wide port
Elliott, Robert (Server Storage)
Elliott at hp.com
Tue Jul 23 05:54:25 PDT 2002
* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <Elliott at hp.com>
*
Comments inline...
> -----Original Message-----
> From: shogo hamasaku [mailto:hamasaku at d1.hw.necst.nec.co.jp]
> Sent: Tuesday, July 23, 2002 3:23 AM
> To: t10 at t10.org
> Subject: questions about wide port
>
>
> Hello,
> I have some questions about wide port connection. I appreciate if
> someone gives me the answer.
>
> I attached the file shows a connection for my question.
>
> Q1. Is this connection allowed?
Yes.
> If yes, I have some additional questions.
> For example, the write command progresses as followings, and my
> questions are in 4..
>
> 1. Initiator device opens the target device.
> The link via Physical Link A-1 through Physical Link B will be
> established.
> 2. Target device issues XFER_RDY.
> It goes through Physical Link B to Physical Link A-1.
> 3. Initiator device sends data.
> It goes through Physical Link A-1 to Physical Link B.
> 4. Initiator device opens the same target device.
> Q2. Is it allowed to send OPEN through A-2 while the connection
> via Physical Link A-1 through Physical Link B is already
> established?
Yes. The initiator is allowed to try opening another connection
over A-2 if A-2 is free. The connection may be to the same or to a
different target.
The initiator probably should not try this unless it knows it is
talking to a wide target, because it will just consume resources
and not provide any performance improvements (see below).
> Q3. If allowed, (1) Does the expander device transfer the Open to
> Physical Link B after waiting for the close of current
> connection?
Yes. If the request were from some other initiator, the expander
would do the same.
> or (2) Does the expander device send OPEN REJECT?
No, we don't have a reason code for "pathway is already open
for you, please use that one."
> or (3) Does the expander device recognize the link is currently
> connected and send OPEN ACCEPT?
No, definitely not.
>
> -----------------------------------------------------------
> Shogo Hamasaku hamasaku at d1.hw.necst.nec.co.jp
>
--
Rob Elliott, elliott at hp.com
Industry Standard Server Storage Advanced Technology
Hewlett-Packard
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