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HP XP P9500 User Manual Page 95

Continuous access synchronous for mainframe systems.
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Table 39 P9500 response characteristics to failure conditions (continued)
Failure condition
Failure of two
physical
devices in a
parity group
Failure of a link between the
MCU and RCU
Failure of NVS
One side of
on the
MCU cache
MCU;Failure of
blocked due to
MCU read
failure
cache
One side of
MCU cache
blocked due to
maintenance
One side of
MCU cache
blocked by SET
CACHE OFF
Both sides of MCU cache
blocked due to failure
Failure of a
Failure of one
disk on the
physical device
RCU
in a parity
group
Failure of two
physical
devices in a
parity group
Continuous
Expected messages
Access
Synchronous Z
pairs
suspended?
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.
No
(1) IEA480 message (SIM for Continuous Access
Synchronous Z 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.
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.
No*
No IEA480, IEA491, or IEA494 messages are
displayed.
No*
No IEA480, IEA491, or IEA494 messages are
displayed.
No
No IEA480, IEA491, or IEA494 messages are
displayed. The MCU returns CC=3 for all I/Os.
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 M-VOL paired with the volume in
the parity group.
(2) No IEA491 or IEA494 messages are
displayed.
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 M-VOL paired with
the volume in the parity group.
(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.
P9500 response characteristics to failure conditions
FREEZE function
Not activated
Not activated
Not activated
Not activated
Not activated
Not activated
Not activated
Activated if the
FREEZE option is
enabled for the
affected LCU
pairs.
95

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