HP XP7 Storage - Manual (Page 13)

Maintenance
When a maintenance operation is needed while Compatible XRC is being used, I/Os for Compatible
XRC pair volumes or Compatible XRC itself should be stopped before the maintenance operation.
If a maintenance operation must be done while Compatible XRC is being used, before you start
the maintenance operation, confirm that the usage of the Sidefile monitor is less than 20% of total
Cache capacity by monitoring each combination of MPPK and CLPR usage. Do not perform the
maintenance operation unless the Sidefile monitor usage is less than 20% of total Cache capacity.
Setting change of the MP blade assigned to LDEVs
The MP blade assigned to the LDEV that is used as a utility volume for Compatible XRC can be
changed only when the XRC session is suspended and the number of the sidefiles of the target
session is zero.
Replacing online microcode
Execution of DEVSERV command on user terminal may display RDF status in EFC field when the
device is online to the IBM host and the online microcode is replaced earlier than 70-03-3x with
70-03-3x and later.
DS QD,9600
IEE459I 17.17.17 DEVSERV QDASD 000
UNIT VOLSER SCUTYPE DEVTYPE CYL SSID SCU-SERIAL DEV-SERIAL EFC
09600 FI9600 2107900 2107900 3339 1900 XX75-64554 XX75-64554 RDF
This shows a difference of functions between DEVSERV command and the device of which host
recognizes. You can resolve this inconsistency by executing following command (xxxx is device
address).
DS QD,xxxx,VALIDATE
DS QD,9600,VALIDATE
IEE459I 17.18.09 DEVSERV QDASD 006
UNIT VOLSER SCUTYPE DEVTYPE CYL SSID SCU-SERIAL DEV-SERIAL EFC
09600 FI9600 2107900 2107900 3339 1900 XX75-64554 XX75-64554 *OK
For the detailed recovery procedure, see DEVSERV Command > Parameter > QDASD section of
the z/OS MVS System Commands manual.
Though RDF appears, the system does not malfunction when this status is shown.
Use the RESUME feature of the XADDPAIR command to resume the session after suspending for
XRC session if you would like to see the latest information in the report.
Sidefile monitor can be incorrect after a failure
When the XRC session is suspended due to a failure, the sidefile monitor might not display 0%,
even if all sessions in CLPR are suspended. If the XRC session is removed, the sidefile monitor
should then display 0%.
Restrictions on usage 13