Hitachi TrueCopy for IBM z/OS User and Reference Guide (T5211-96001, June 2007)

Using PPRC Commands for TrueCopy for z/OS A-45
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
Table A-13 USP V Response Characteristics to Failure Conditions (continues on the next
page)
Failure Condition TCz Pairs
Suspended?
Expected Messages FREEZE
Function
Failure of all channel interfaces on the MCU No No IEA480, IEA491, or IEA494 messages are
displayed.
Not
activated
Failure of a disk on the
MCU
Failure of one
physical device
in a parity group
No (1) IEA480 message (SIM for physical device blocked
or port of physical device blocked) is displayed when
the next I/O is issued to any volume in the parity
group.
(2) No IEA491 or IEA494 messages are displayed.
Not
activated
Failure of two
physical devices
in a parity group
No (1) IEA480 message (SIM for LDEV blocked) is
displayed when the next I/O is issued to any volume in
the parity group.
(2) No IEA491 or IEA494 messages are displayed.
Not
activated
Failure of a link between the MCU and RCU No (1) IEA480 message (SIM for TCz path blocked) is
reported when the next I/O to any device in this MCU
is issued.
(2) No IEA491 or IEA494 messages are displayed.
Not
activated
Failure of NVS on the
MCU;
Failure of MCU read
cache
One side of
MCU cache
blocked due to
failure
No* (1) IEA480 (SIM for cache blocked) is reported when
the next I/O to any device in this MCU is issued.
(2) No IEA491 or IEA494 messages are displayed.
Not
activated
One side of
MCU cache
blocked due to
maintenance
No*
No IEA480, IEA491, or IEA494 messages are
displayed.
Not
activated
One side of
MCU cache
blocked by SET
CACHE OFF
No*
No IEA480, IEA491, or IEA494 messages are
displayed.
Not
activated
Both sides of MCU cache blocked due to
failure
No No IEA480, IEA491, or IEA494 messages are
displayed.
Note: The MCU returns CC=3 for all I/Os.
Not
activated
Failure of a disk on the
RCU
Failure of one
physical device
in a parity group
No (1) The RCU reports IEA480 message (SIM for physical
device blocked or port of physical device blocked) to
either the MCU or the host processor (whichever issues
the next I/O first) when the next I/O is issued to any
volume in the parity group. If MCU receives the SIM, it
passes the SIM to the attached host processor, and the
IEA480 message is reported when the next I/O to this
MCU is issued to any main (primary) volume paired
with the volume in the parity group.
(2) No IEA491 or IEA494 messages are displayed.
Not
activated
Failure of two
physical devices
in a parity group
Yes (1) The RCU reports IEA480 message (SIM for LDEV
blocked) to either the MCU or the host processor
(whichever issues the next I/O first) when the next I/O
is issued to any volume in the parity group. If MCU
receives the SIM, it passes the SIM to the attached
host processor, and the IEA480 message is reported
when the next I/O to this MCU is issued to any main
volume paired with the volume in the parity group.
(2) One (or more) IEA494 messages showing EXTENDED
LONG BUSY are displayed.
Activated if
the FREEZE
option is
enabled for
the affected
LCU pairs.