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@emulex.com