Usage Rates Of Mps; Usage Rate Of Drrs; Usage Rate Of Cache Memory - HPE XP7 User Manual

Usage rates of MPs

Function
The usage rate of the MP shows the usage rate of an MP assigned to a logical device. If a usage
rate of an MP is high, I/Os concentrate to an MP. Examine the distribution of I/Os to other MP
blades.
Storing period
Short-Range or Long-Range can be specified.
Selection of monitoring objects
Select the desired monitoring objects in the Performance Objects field.
Item on left side of Object
field
Controller

Usage rate of DRRs

Function
A data recovery and reconstruction processor (DRR) is a microprocessor (located on the DKAs
and CHAs) 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.
If the monitor data shows high DRR usage overall, perform either of the following operations to
distribute the workload for the system:
Move a volume whose write usage rate is high (especially, sequential write usage rate) from
a RAID-5 (or RAID-6) parity group to a RAID-1 parity group.
Move the data to another storage system.
Use Auto LUN to move a volume. For details on Auto LUN, see the XP7 Auto LUN User Guide.
If the monitor data shows relatively high DRR usage overall, the performance of the system might
not be improved even after moving a volume using Auto LUN.
Storing period
Short-Range or Long-Range can be specified.
Selection of monitoring objects
Select the desired monitoring objects in the Performance Objects field.
Item on left side of Object
field
Controller

Usage rate of cache memory

Function
When you display monitoring results in a short range, the window displays the usage rates about
the cache memory for the specified period of time.
Item on right side of
Object field
MP
Item on right side of
Object field
DRR
Item on left side of
Monitor Data field
Usage Rate (%)
Item on left side of
Monitor Data field
Usage Rate (%)
Item on right side of
Monitor Data field
None
Item on right side of
Monitor Data field
None
Usage rates of MPs 33