HP XP P9500 Storage - Manual (Page 26)

Monitoring data Monitoring target object
Cache hit (%).
Data transfer (MB/s).
Response time (ms).
Back transfer (count/sec).
Drive usage rate (%).*
Total throughput (IOPS). LUN
Read throughput (IOPS).
Write throughput (IOPS).
Cache hit (%).
Data transfer (MB/s).
Response time (ms).
Back transfer (count/sec).
Data transfer of logical devices (MB/s). External Storage
Response time of logical devices (ms).
Data transfer of parity groups (MB/s).
Response time of parity groups (ms).
* Only information about internal volumes is displayed. Information about external volumes and
FICON DM volumes is not displayed.
Usage rates of processor blade(s)
Function
The usage rate of the processor blade (MP blade for short) shows the usage rate of a processor
blade assigned to a logical device. If a usage rate of a processor blade is high, I/Os concentrate
to a processor blade. Examine the distribution of I/Os to other processor blades.
Storing period
Short-Range or Long-Range can be specified.
Selecting of monitoring objects
Select monitoring objects in Performance Objects: field. The combination of items is shown as
follows.
Item on right side of Monitor
Data: field Item on left side of Monitor
Data: field Item on right side of Object:
field Item on left side of Object:
field
None Usage Rate (%) MP Controller
Usage rate of a data recovery and reconstruction processor
Function
A data recovery and reconstruction processor (DRR) is a microprocessor (located on the DKAs and
channel adapters) that is used to generate parity data for RAID 5 or RAID 6 parity groups. The
DRR uses the formula "old data + new data + old parity" to generate new parity.
26 Working with graphs