HP XP7 Storage - Manual (Page 126)

The following figure provides example output when CQUERY is issued to an S-VOL with an P-VOL
has been split by the CGROUP/FREEZE command. The pair status and path status at the RCU are
not changed.
IEA494I and IEA491E console messages
When a pair is split, whether user-requested or caused by failure, the MCU generates sense
information to notify the hosts. If the PPRC ERP PTF is installed and PPRC support by host = Yes is
selected on the Remote Web Console Change CU Options window, this notification results in an
IEA494I system console message and an IEA491E message. The IEA491E message indicates the
reason for the split. The IEA494I and IEA491E messages are generated by the zSeries and S/390
host based upon SSBs (sense bytes) from the storage system and not SIMs from the storage system.
Therefore, SIMs reported by the storage system to the host are not used by the GDPS scripting.
The IEA494I message is recommended as a trigger for automation over the IEA491E message.
The IEA491E message is reported to only one host system, whereas the IEA494I message is reported
to all attached MVS hosts each time the P-VOL pair status changes. GDPS uses the IEA494I message
with extended long busy as a trigger for CGROUP (FREEZE/RUN).
If you have specified PPRC support by host = No, the host generates the system console message
that includes the SIM instead of the IEA494I or IEA491E message.
IEA494I message
When a Cnt Ac-S Z pair status changes, with the exception of the transition states suspending and
deleting, the MCU reports state change interrupt (SCI) to all hosts. In response to the SCI, the
IEA494I system console message is generated (if supported by the host). XP7 reports SCI for both
126 Pair operations using PPRC