03-002r0: Remove SPI from SAM-3 and SPC-3 [a little bit more]
Elliott, Robert (Server Storage)
Elliott at hp.com
Tue Jan 7 17:11:05 PST 2003
* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <Elliott at hp.com>
There is one other SCSI transport that still uses contingent allegiance
(CA): ATAPI (ATA Packet Interface, defined in T13's ATA/ATAPI standard).
ATAPI devices will still require REQUEST SENSE, regardless of their
command set (most likely but not exclusively MMC). Perhaps that
requirement could be documented in ATA/ATAPI-7 itself.
Many devices let applications poll with REQUEST SENSE to retrieve sense
data containing progress indication - the status of long operations like
FORMAT MEDIUM or self-test. I don't think autosense can replace this
usage. REQUEST SENSE might only need to be required for devices
implementing those commands, though.
A quick web search shows at least one Fibre Channel driver might get
upset if a target chose not to support autosense (but only after it had
trouble delivering the autosense data in the first place):
"The driver now issues a request sense when an FCP_RSP is received with
check condition status, but no sense data (CR#3872)"
Rob Elliott, elliott at hp.com
Hewlett-Packard Industry Standard Server Storage Advanced Technology
> -----Original Message-----
> From: Ralph Weber [mailto:ralphoweber at compuserve.com]
> Sent: Saturday, January 04, 2003 7:39 PM
> To: T10, Reflector
> Subject: 03-002r0: Remove SPI from SAM-3 and SPC-3 [a little bit more]
> * From the T10 Reflector (t10 at t10.org), posted by:
> * Ralph Weber <ralphoweber at compuserve.com>
> In my haste to get the word out on 03-002, one
> interesting question was overlooked.
> If sense data ALWAYS arrives concurrently
> with the CHECK CONDITION status, is it
> any longer critical that the REQUEST SENSE
> command be mandatory for all devices?
> May you live in interesting times.
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