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The line graph illustrates changes in the I/O rate, the transfer rate, etc.
The vertical axis indicates the usage rates (in percentage). The horizontal
axis indicates dates and/or times.
If you select connected parity groups in the tree, the graph illustrates
changes in disk access performance (e.g., the I/O rate and the transfer
rate) for all the connected parity groups.
Before clicking Draw, use the list at the right corner of the list (just below
the list for specifying the type of statistics) to specify the type of
information that will be displayed in the graph. The list to specify the item
to be displayed is shown below.
Figure 4-6
The items that can be selected in the list change depending on the type of
statistics you selected. Some items can be selected only when you select
I/O rate (IOPS) or the transfer rate (MB/s). The items you can select in
the list and the corresponding type of statistics are shown in Table 4-1.
Table 4-1
Items You Can Select in the List and the Types of Statistics
(LDEV Tab)
Item selected in the
list
IO Rate
Read
Write
Read Hit
Write Hit
Back Trans.
Trans.
: Can be selected (blank): Cannot be selected
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User's Guide
Selecting an Item to be Displayed in the Graph (LDEV
Tab)
The I/O rate. The number of I/O accesses per
second).
The number of read accesses per second.
The number of write accesses per second.
The read hit ratio.
The write hit ratio.
Backend transfer. The number of data transfers
between the cache memory and the hard disk
drive.
The transfer rate. The size of data transferred per
second.
Using the Performance Manager GUI
Meaning
Type of statistics
I/O
transfer
rate
rate
4-13
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