Hitachi MK-96RD617-08 - Manual (Page 34)

2-18 About Performance Manager Options
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User’s Guide
– If I/O workloads between hosts and the storage system become heavy,
the storage system gives higher priority to I/O processing than
monitoring processing, therefore, a part of monitoring data might be
missing. In case that monitoring data are missing frequently, use the
Gathering Interval option in the Monitoring Options window to
change the collection interval longer. For details, see Start Monitoring
and Monitoring Options Window.
– The statistics of monitoring data of pool volumes is included in the
statistics of monitoring data of V-VOLs. For this reason, the pool
volumes are not displayed in LDEV tab.
• Viewing the WWN tab
To start monitoring traffic between host bus adapters and storage system
ports, you must make settings before starting monitoring. For details, see
Monitoring All Traffic between HBAs and Ports and Setting Priority for Host
Bus Adapters.
• Displaying monitoring data
– In lists of the Performance Management window contents, a hyphen
(-) might be displayed in monitoring data columns. It means that the
statistics of that monitoring item cannot be collected.
– If the SVP is overloaded, more time than the gathering interval allots
might be required for updating the display of monitoring data. In this
case, some portion of monitoring data will not be displayed in the
window. For example, suppose that the gathering interval is 1 minute.
In this case, if the display in the Performance Management window
is updated at 9:00 and the next update occurs at 9:02, the window
(including the graph) does not display the monitoring result for the
period of 9:00 to 9:01. This situation occurs when you use a Storage
Navigator computer, as well as when the SVP is used to perform
maintenance operations for the DKC.
– After you set Monitoring Switch to Enable, the SVP might be
overloaded for up to 15 minutes if Performance Monitor receives a
couple of data items.
– After LDEVs are installed or CUs to be monitored are added, the SVP
might be overloaded for up to 15 minutes if Performance Monitor
receives a couple of data items.
• Replacing the microprogram
After the microprogram was replaced, the monitoring data is not stored
until a service engineer releases the SVP from Modify mode. Therefore,
inaccurate monitoring data may be displayed temporarily.
Server Priority Manager
• User types. If the user type of your user ID is storage partition
administrator, you cannot use Server Priority Manager. For details on the
limitations when using Performance Manager logged in as a storage
partition administrator, see Storage Partition Administrators Limitations.