Hitachi MK-96RD617-08 - Manual (Page 108)

5-26 Performance Monitor Operations
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User’s Guide
Paths between cache switches and cache memory:
Figure 5-12 Examples of Usage Statistics Displayed in the List
• : When the green checkmark icon is displayed on the left of the
access path, the graph illustrates changes in usage rate for the access
path.
• Adapter: This column indicates adapters.
• CSW: This column indicates cache switches.
• SM: This column indicates shared memories.
• Cache: This column indicates the cache memories.
• Usage:
– The Ave. (Total) column displays the average usage rate for the
specified period.
– The Max. column displays the maximum usage rate for the specified
period.
Monitoring Hard Disk Drives
The LDEV tab of the Performance Management window lets you check
workloads on physical hard disk drives (parity groups) or on volumes. The
LDEV tab displays the I/O rate and the transfer rate. The I/O rate indicates
the number of disk I/Os per second. The transfer rate indicates the size of
data transferred to the disk in one second.
In addition, the LDEV tab displays the read hit ratio and the write hit ratio.