HP XP P9500 Storage - Manual (Page 95)

Table 39 P9500 response characteristics to failure conditions (continued)
FREEZE function Expected messages Continuous
Access
Synchronous Z
pairs
suspended? Failure condition
Not activated (1) IEA480 message (SIM for LDEV blocked) is
displayed when the next I/O is issued to any
volume in the parity group. No Failure of two
physical
devices in a
parity group
(2) No IEA491 or IEA494 messages are
displayed.
Not activated (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. No Failure of a link between the
MCU and RCU
(2) No IEA491 or IEA494 messages are
displayed.
Not activated (1) IEA480 (SIM for cache blocked) is reported
when the next I/O to any device in this MCU is
issued. No* One side of
MCU cache
blocked due to
failure Failure of NVS
on the
MCU;Failure of
MCU read
cache
(2) No IEA491 or IEA494 messages are
displayed.
Not activated No IEA480, IEA491, or IEA494 messages are
displayed. No* One side of
MCU cache
blocked due to
maintenance
Not activated No IEA480, IEA491, or IEA494 messages are
displayed. No* One side of
MCU cache
blocked by SET
CACHE OFF
Not activated No IEA480, IEA491, or IEA494 messages are
displayed. The MCU returns CC=3 for all I/Os. No Both sides of MCU cache
blocked due to failure
Not activated (1) The RCU reports IEA480 message (SIM for
physical device blocked or port of physical device No Failure of one
physical device Failure of a
disk on the
RCU
blocked) to either the MCU or the host processor in a parity
group
(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.
Activated if the
FREEZE option is (1) The RCU reports IEA480 message (SIM for
LDEV blocked) to either the MCU or the host Yes Failure of two
physical
enabled for the processor (whichever issues the next I/O first) devices in a
parity group
affected LCU
pairs. 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 95