HP StorageWorks XP Remote Web Console Software - Manual (Page 183)

Hitachi TrueCopy for z/OS user guide 183
Failure of NVS on the RCU; Failure of RCU read cache
a. One side of RCU
cache blocked due
to failure
No 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.
Not
activated
b. One side of RCU
cache blocked due
to maintenance
No No IEA480, IEA491, or IEA494 messages are
displayed.
Not
activated
c. One side of RCU
cache blocked by
SET CACHE OFF
No No IEA480, IEA491, or IEA494 messages are
displayed.
Not
activated
Both sides of RCU cache
blocked due to failure
Yes 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 TC390 pairs for which FREEZE
option is enabled and from main volumes
that did not already report IEA491/IEA494
at (3).
Activated if
the FREEZE
option is
enabled for
the affected
LCU pairs.
Failure of all links between
the MCU and RCU
Yes 1. IEA480 (SIM for TC390 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.
Activated if
the FREEZE
option is
enabled for
the affected
LCU pairs.
Power failure
a. On the MCU No No IEA480, IEA491, or IEA494 messages are
displayed.
Not
activated
b. On the RCU Yes 1. IEA480 (SIM of TC390 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.
Activated if
the FREEZE
option is
enabled for
the affected
LCU pairs.
1. When one side of the MCU cache is blocked, duplex TC390 pairs are not affected, but pending duplex TC390 pairs are
suspended. Suspending TC390 pairs with pending duplex status provides additional protection in the unlikely event of a
cache failure.
Table 46 XP12000/XP10000 response characteristics to failure conditions (continued)
Failure Condition TC390 Pairs
Suspended?
Expected Messages FREEZE
Function