Martin:
The issue here is that if you are not connected to a SAS device,
you will transition to SP1, and there you will have to wait for a hotplug
timeout before you re-enter SP0 and transmit a COMMINIT. At that point,
hopefully both devices will be in sync and they will both detect
COMMINIT/COMWAKE appropriately and continue. If the COMMINIT detected was
passed into SP0 you would avoid this hotplug timeout.
Bill Martin
Emulex
Office of Technology
Industry Standards
916 772-3658
916 765-6875 (Cell)
bill.martin@emulex.com
From: Martin Schulze
[mailto:Martin.Schulze@wdc.com]
Sent: Thursday, November 20, 2008 3:38 PM
To: Martin, Bill
Cc: t10@t10.org
Subject: RE: SAS transition from SP12 to SP0
From my reading of the standard, I do not believe the SP machine
needs to remember that receiving a COMINIT is what brought it to SP0. Nor
does it need to receive a COMINIT in SP0:OOB_COMINIT. Sending a COMINIT
in SP0 and then both sending and receiving COMSAS (in other states) is
sufficient to bring the bus to the start of SNW1.
Martin Schulze
Western Digital
From: owner-t10@t10.org
[mailto:owner-t10@t10.org] On Behalf Of Bill.Martin@Emulex.Com
Sent: Thursday, November 20, 2008 3:18 PM
To: t10@t10.org
Cc: Shiro.Suzuki@Emulex.Com
Subject: FW: SAS transition from SP12 to SP0
I have not seen a response on this, does anyone have any input
on the original intent on this transition?
Thanks,
Bill Martin
Emulex
Office of Technology
Industry Standards
916 772-3658
916 765-6875 (Cell)
bill.martin@emulex.com
From: owner-t10@t10.org
[mailto:owner-t10@t10.org] On Behalf Of Bill.Martin@emulex.com
Sent: Monday, November 17, 2008 1:11 PM
To: t10@t10.org; Elliott@hp.com
Subject: SAS transition from SP12 to SP0
When
a SAS device is in the SP12::SAS_AwaitSNW, receives a COMINIT, and transitions
to the SP0:OOB_COMINIT, shall the device remember that it has detected COMINIT
or shall it wait for another COMINIT to be received? There is no mention
of carrying a state variable forward to the SP0 state.
Thanks
for any and all opinions.
Bill Martin
Emulex
Office of Technology
Industry Standards
916 772-3658
916 765-6875 (Cell)
bill.martin@emulex.com