Question on Read-Write Error Recovery mode page PER operation

Bill.Martin at Emulex.Com Bill.Martin at Emulex.Com
Fri Nov 7 15:42:46 PST 2008


Formatted message: <a href="r0811071_f.htm">HTML-formatted message</a>

In the description of PER in the Read-Write Error Recovery mode page, the
following is stated:
A post error (PER) bit set to one specifies that if a recovered read error
occurs during a command performing a read or write operation, then the device
server shall terminate the command with CHECK CONDITION status with the sense
key set to RECOVERED ERROR. A PER bit set to zero specifies that if a
recovered read error occurs during a command performing a read or write
operation, then the device server shall terminate the command with CHECK
CONDITION status, and shall perform error recovery procedures within the
limits established by the error recovery parameters. If the DTE bit is set to
one, then the PER bit shall be set to one.
It seems that the first and second sentences require mostly the same thing as
far as reporting a CHECK CONNDITION.  I think that the second sentence is
missing a "not" in the device server shall NOT terminate the command with
CHECK CONDITION status, ...
This interpretation is consistent with the first two rows of table 128 also,
which state "The device server shall not report recovered read errors. The
device server shall terminate a command performing a read or write operation
with CHECK CONDITION status before the transfer count is exhausted only if an
unrecovered error is detected."
Bill Martin
Emulex
Office of Technology
Industry Standards
916 772-3658
916 765-6875 (Cell)
bill.martin at emulex.com



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