Hitachi TrueCopy for IBM z/OS User and Reference Guide (T5211-96001, June 2007)

Using PPRC Commands for TrueCopy for z/OS A-41
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
IEA494I and IEA491E Console Messages
When a TCz pair is suspended, whether user-requested or due to failure, the
MCU generates sense information to notify the host(s). If the PPRC ERP PTF is
installed and PPRC Support = Yes is selected on the RCU option dialog box,
this notification results in an IEA494I system console message as well as an
IEA491E message. The IEA491E message indicates the reason for suspension.
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 M-VOL pair status changes. GDPS uses the IEA494I message with
extended long busy as a trigger for CGROUP (FREEZE/RUN).
Note: If PPRC Support = No is selected on the RCU Option dialog box, the
host generates the system console message that includes the SIM instead of
the IEA494I or IEA491E message.
IEA494I Message
Whenever a TCz pair status changes, with the exception of the TCzA 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). USP V reports SCI for both online and
offline devices, but the host system does not generate console messages for
offline devices. Therefore, the IEA494I message is never generated with a TCz
R-VOL device address. Figure A.9 shows an example of an IEA494I message.
• The USP V MCU reports SCI for all TCzA pairs whose status has changed,
regardless of the Group/Volume option of the suspend or release pair
operation (if the status change was user-requested).
• The USP V MCU reports SCI for all TCz M-VOLs (synchronous only) which are
in the SCP state due to the CGROUP/FREEZE command. As shown in Figure
A.9, this IEA494I message indicates the extended long busy state.
• The USP V MCU reports SCI for all TCz M-VOLs (synchronous only) which are
suspended due to the CGROUP/RUN command. This IEA494I message
indicates the extended long busy state.
• When the FREEZE option is enabled, the USP V MCU reports SCI for a TCz
pair which is suspended due to a failure. When the host supports GDPS, this
IEA494I message with extended long busy triggers the CGROUP
(FREEZE/RUN) command.