HP XP P9500 Storage - Manual (Page 719)

Executing the YKWATCH or YKQUERY command updates information such as the status of REXX
variables. Similarly, pressing the F4=Refresh key in the ISPF window updates the displayed status
information.
Performance Monitor
Performance monitor is a function that monitors events that may cause an error in the future. It also
provides information to help prevent the error or identify the cause of errors when they occur. For
details about the information acquired by Performance Monitoring, see the description about the
Copy Group Status Summary panel in the HP XP P9000 for Business Continuity Manager Software
Reference Guide.
Performance Monitoring is achieved via the following means:
•
The YKQUERY command: To obtain the statuses of copy pairs
•
The YKSTATS command: To obtain TCA and Cnt Ac-J Z copy group performance information
NOTE: The Usage monitor must be running when the function to obtain performance statistics
(the YKSTATS command) is used. For Cnt Ac-J Z, start the Usage monitor from Remote Web
Console for the control unit that includes the journal volumes used in the copy group definition
file. Set the information collection interval for the Usage monitor to 10 minutes or less.
•
The ISPF panel: To display the consistency group time and the monitoring information shown
in
Table 127 (page 719)
Table 127 Monitoring Information
Target Copy Type Possible Reasons To Acquire This Information Monitoring Information
Cnt Ac-S
Z/TCA/Cnt Ac-J Z If the copy pair matching rate is not increasing and the line
usage rate is low, then a line error might be occurring. Copy pair matching rate
TCA/Cnt Ac-J Z If the data transfer rate is low, then a line error might be
occurring. Data transfer rate
TCA If the sidefile cache usage rate, which is required for
maintaining the update I/O records in TCA copy groups, is Sidefile cache-usage rate
high, then a cache overflow or a line error might be
occurring.
TCA If the write pending rate is high, then a line error might be
occurring. Write pending rate
Cnt Ac-J Z When inter-journal group operating information is NG for
a Cnt Ac-J Z, this might be due to a line failure or a failure
at another storage system. Inter-journal group
operating information
Cnt Ac-J Z If the usage rate is high for metadata or data secured on a
journal volume for a Cnt Ac-J Z, then a journal volume might
overflow. Journal volume metadata
usage rate/data usage
rate
Trace Output Method
To help analyze the causes of failures, trace information can be used. Trace information, such as
user operations and macro calls to hardware, is saved in memory. In Business Continuity Manager,
all the trace information currently saved in memory is output to the ABEND dump when a CLI
command terminates abnormally.
Also, when an operator invokes GTF with the GTF parameter set to acquire USR trace information
(TRACE=USR), trace information is acquired as a GTF trace, with an event code from X'300' to
X'30F'.
Performance Monitor 719