HP StorageWorks XP Remote Web Console Software - Manual (Page 166)

166 TrueCopy for the XP128/XP1024/XP10000/XP12000
¬ Failure of a link between
the MCU and RCU
No 1. IEA480 message (SIM for TC390 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
Ð Failure of NVS on the MCU; Failure of MCU read cache
a. One side of MCU
cache blocked due
to failure
No 1 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
b. One side of MCU
cache blocked due
to maintenance
No 1 No IEA480, IEA491, or IEA494 messages are
displayed.
Not
activated
c. One side of MCU
cache blocked by
SET CACHE OFF
No 1 No IEA480, IEA491, or IEA494 messages are
displayed.
Not
activated
ƒ Both sides of MCU cache
blocked due to failure
No No IEA480, IEA491, or IEA494 messages are
displayed.
The MCU returns CC=3 for all I/Os.
Not
activated
Ý Failure of a disk on the RCU
a. 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
logical 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 logical volume in the
parity group.
2. No IEA491 or IEA494 messages are
displayed.
Not
activated
b. 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
logical 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 logical 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.
Activated if
the FREEZE
option is
enabled for
the affected
LCU pairs.
Table 40 XP128/XP1024/XP10000/XP12000 response characteristics to failure conditions (continued)
Failure Condition TC390 Pairs
Suspended?
Expected Messages FREEZE
Function