Hp Command View EVA Software Bedienungsanleitung PDF herunterladen (Seite 97)

• Read Req/s—The number of read requests (per second) sent to physical disks.

• Read MB/s—The rate at which data is read (per second) from physical disk.

• Read Latency—The average time it takes for a disk to complete a read request.

• Write Req/s—The number of write requests (per second) sent to physical disks.

• Write MB/s—The amount of data written (per second) to physical disks.

• Write Latency—The amount of time it takes for a disk to complete a write request.

HP EVA physical disk group

The HP EVA physical disk group object provides information about physical disk activity per disk

group. For each disk group, metrics are reported that represent the averages of various counters

across all the disks in the disk group. The counters record all activity to the disks, including traffic

for host data transfers and internal system support. This activity includes metadata updates, cache

flushes, prefetch, sparing, leveling, snapclone and snapshot support, and redundancy traffic such

as parity reads and writes or mirror copy writes. Each controller’s activity is reported separately,

so the total activity to each disk group is the sum of both controllers’ activity.

For each counter, the results are an average of all disks in the disk group.

The counters are:

• Average Drive Queue Depth—The average number of all active requests to each disk

in the disk group, over all the disks in the disk group.

• Average Drive Latency—The average time between when a data transfer command is

sent to a disk and when command completion is returned from the disk. The time is not

separated into read and write latencies. Completion of a disk command does not necessarily

imply host request completion, because the request to a specific physical disk might be only

a part of a larger request operation to a virtual disk.

On the HSV100 series of controllers, only average latency (the average of read and write

latencies) is reported. From the HSV200 series of controllers onwards, separate metrics are

provided for read and write latency.

• Average Read Req/s—The number of read requests (per second) sent to physical disks.

• Average Read MB/s—The rate at which data is read (per second) from physical disk.

• Average Read Latency—The average time it takes for a disk to complete a read request.

This average is weighted by requests per second (HSV200 controller series onwards).

• Average Write Req/s—The number of write requests (per second) sent to physical disks.

• Average Write MB/s—The amount of data written (per second) to physical disks.

• Average Write Latency—The average time it takes for a disk to complete a write request.

This average is weighted by requests per second (HSV200 controller series onwards).

HP EVA DR tunnels

The HP EVA DR tunnels object reports the intensity and behavior of the link traffic between source

and destination storage systems. The counters for this object display information only if there is at

least one active DR group on the storage system; otherwise, only the header appears. You can

display metrics in either MBs or KBs. Creation and management of DR groups is not supported by

HP P6000 Command View array-based management.

Although some storage systems allow up to four open tunnels on a host port, only one tunnel is

active for a single DR group. Multiple DR groups can share the same tunnel. Statistics for each

tunnel are reported by both the source and destination storage systems, but the directional counters

are complementary. The port names are displayed as FP1 and FP2 for the HSV100, HSV110,

Using the graphical user interface 97

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