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HP XP P9500 User Manual Page 96

Continuous access synchronous for mainframe systems.
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Table 39 P9500 response characteristics to failure conditions (continued)
Failure condition
Failure of NVS
on the
RCU;Failure of
RCU read
cache
Both sides of RCU cache
blocked due to failure
Failure of all links between the
MCU and RCU
Power failure
96
Using PPRC commands for Continuous Access Synchronous Z
Continuous
Access
Synchronous Z
pairs
suspended?
One side of
No
RCU cache
blocked due to
failure
One side of
No
RCU cache
blocked due to
maintenance
One side of
No
RCU cache
blocked by SET
CACHE OFF
Yes
Yes
On the MCU
No
On the RCU
Yes
Expected messages
(1) The RCU reports IEA480 message (SIM for
cache blocked) to either the MCU or the host
processor (whichever issues the next I/O first). If
MCU receives the SIM, it passes the SIM to the
attached host processor. Therefore, IEA480 is
reported when the next I/O to any device in this
MCU issued.
(2) No IEA491 or IEA494 messages are
displayed.
No IEA480, IEA491, or IEA494 messages are
displayed.
No IEA480, IEA491, or IEA494 messages are
displayed.
(1) No IEA480 (SIM of cache blocked) is
displayed.
(2) One (or more) IEA494 messages showing
EXTENDED LONG BUSY are displayed.
(3) One (or more) IEA491 and IEA494 messages
showing PAIR SUSPENDED are displayed.
(4) If CGROUP FREEZE and RUN are issued,
IEA494 messages showing PAIR SUSPENDED are
displayed when the MCU accepts CGROUP RUN.
These messages are from the Continuous Access
Synchronous Z pairs for which FREEZE option is
enabled, and from main volumes which did not
already report IEA491/IEA494 at (3).
(1) IEA480 (SIM for Continuous Access
Synchronous Z path blocked) message is reported
when the next I/O to any device in this MCU is
issued.
(2) One (or more) IEA494 messages showing
EXTENDED LONG BUSY are displayed.
(3) One (or more) IEA491 and IEA494 messages
showing PAIR SUSPENDED are displayed.
No IEA480, IEA491, or IEA494 messages are
displayed.
(1) IEA480 (SIM of Continuous Access
Synchronous Z path blocked) message is reported
when the next I/O to any device in this MCU is
issued.
FREEZE function
Not activated
Not activated
Not activated
Activated if the
FREEZE option is
enabled for the
affected LCU
pairs.
Activated if the
FREEZE option is
enabled for the
affected LCU
pairs.
Not activated
Activated if the
FREEZE option is
enabled for the

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