some questions about SAM-5

Wei(SOCP) Liu liuw at marvell.com
Wed Jan 22 04:25:03 PST 2014


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Hi,
I have some questions about SAM-5. Could you kindly help to answer? Thanks.
1.	 In 4.6.4.2, "SCSI Device Name attribute", "A SCSI device name shall
never change and may be used for persistent identification of a SCSI device
in contexts where specific references to initiator port names, target port
names, initiator port identifiers, or target port identifiers are not
required."
My question is when to use Device Name, port name and port identifier?
2.	 With Command identifier defined, why CRN(Command Reference Number)
is also defined? How is it used by device sever?
3.	 In 5.14.1, "Unit attention conditions that are not coalesced",
"c) if a REQUEST SENSE command enters the enabled command state while a unit
attention condition exists for the SCSI initiator port associated with the
I_T nexus on which the REQUEST SENSE command was received, then the device
serv er shall process the command and either:
A) report any pending sense data as parameter data and preserve all unit
attention conditions on the logical unit; or
B) report a unit attention condition as parameter data for the REQUEST SENSE
command to the SCSI initiator port associated with the I_T nexus on which the
REQUEST SENSE command was received."
When sense data is returned and when unit attention condition is returned? Is
there a function with parameter to designate which to return?
4.	 What's the difference between CLEAR TASK SET and ABORT TASK SET?
Regards,
Wei Liu



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