Hitachi MK-96RD617-08 - Manual (Page 47)

Using the Performance Manager GUI 4-5
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User’s Guide
When you specify dates and time in From and To, Performance Monitor
calculates the length of the specified period and displays the calculated
length. The length of the period is displayed in days when you select
longrange, and it is displayed in minutes when you select shortrange.
Notes:
From and To are unavailable if the monitoring data (that is, usage
statistics) is not stored in the storage system.
The Real Time option is unavailable when the Physical tab is active.
• In the Monitoring Data area, the list on the upper right specifies the type
of statistics to be displayed in the window. When the Physical tab is
active, the list contains only one entry (i.e., Usage).
• The tree lists items such as parity groups, channel adapters (CHAs). The
tree can display the following items.
– Icon displayed below the Parity Group or External Group folder:
a parity group or an external volume group
– Icons displayed below the CHA folder:
* an ESCON channel adapter
* a FICON channel adapter
* a Fibre Channel adapter in Standard mode
* a Fibre Channel adapter in High Speed mode
* a Fibre Channel adapter in Initiator/External MIX mode
* The channel adapter number and number of ports that displayed on the right side of the
icon are examples.
– Icons displayed below the DKA folder:
a disk processor (DKP)
a data recovery and reconstruction processor (DRR)
– Icon displayed below the Access Path Usage folder:
an access path
No icon is displayed below the Cache folder.
The numbers on the right of icons ( ) displayed below the Parity Group
or External Group folder are IDs of parity groups or external volume
groups. The letter "E" at the beginning of an ID indicates that the group is
an external volume group.
A volume existing in an external storage system and mapped to a volume
in the USP V/VM storage system by using Universal Volume Manager is
called an external volume. An external volume group is a quantity of
external volumes grouped together for managing and that do not contain
any parity information, unlike a parity group. However, Performance
Management window treats external volume groups same as parity
groups for convenience.