Robert.Elliott at COMPAQ.com
Thu Mar 28 15:32:34 PST 2002
* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert" <Robert.Elliott at COMPAQ.com>
I think the INQUIRY AERC bit needs rewording.
"The asynchronous event reporting capability (AERC) bit indicates that
the target supports the asynchronous event reporting capability as
defined in SAM-2. The AERC bit is qualified by the PERIPHERAL DEVICE
TYPE field as follows:
a) Processor device-type definition: An AERC bit of one indicates
that the processor device is capable of accepting asynchronous event
reports. An AERC bit of zero indicates that the processor device
does not support asynchronous event reports; or
b) All other device-types: This bit is reserved.
Details of the asynchronous event reporting support are protocol specific."
I think the intention is to identify which processor devices can receive
AERs (with SEND commands), not which target devices can generate AERs
(by whatever method the protocol supports). The latter can be determined
by checking if any of the three Control mode page AER bits are changeable.
A processor device type probably cannot itself generate AERs, because it
does not define support for the Control mode page.
Rob Elliott, Compaq Server Storage
Robert.Elliott at compaq.com
> -----Original Message-----
> From: Ken Craig [mailto:kcraig at istor-networks.com]
> Sent: Thursday, March 28, 2002 5:01 PM
> To: t10 at t10.org
> Subject: AER functionality
> * From the T10 Reflector (t10 at t10.org), posted by:
> * "Ken Craig" <kcraig at istor-networks.com>
> I have a question concerning AER functionality. My reference points
> SPC-3 revision 4, 12 February 2002
> SAM-2 revision 22, 24 Feb, 2002.
> The INQUIRY command says that reporting AER functionality is reserved
> for all device types except a processor device and the
> Control Mode page
> has the fields to control how/when the reporting is done.
> The descriptions that describe the examples in SAM-2, section 188.8.131.52,
> seem to describe events that could occur in non-processor
> device types.
> For instance the explanation for example a talks about a device with a
> write cache. If this was a disk and it had reported itself as a disk
> type in the INQUIRY data how could it send an AER based on the
> definition in SPC-3?
> My question is "Is the description in the INQUIRY command concerning
> which device types can report supporting AER functionality
> wrong or can
> the settings in the Control Mode page enable AER functionality even
> though a non-processor device type has been reported which means the
> AER bit in the INQUIRY data was set to 0?"
> Kenneth Craig
> * For T10 Reflector information, send a message with
> * 'info t10' (no quotes) in the message body to majordomo at t10.org
* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at t10.org
More information about the T10