Array Performance by RAID Group
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For a list of Array Families, collected performance statistics, and details on how performance profiles are determined, see Certified Configurations Guide.
For CLARiiON arrays, a LUN that is assigned to a Pool (as is required for dynamic provisioning) will not have any performance statistics collected.
HP 3PAR arrays are represented uniquely with each Common Provisioning Group (CPG) represented as a RAID Group. Virtual volumes (VV) can be allocated directly, outside of a CPG with each VV being represented as an individual RAID Group.
Array LUN performance response times (total, read, write) are not provided in reports for the following array families: EMC Symmetrix, Dell Compellent, and HP 3PAR.
Note:
Column aggregations are displayed in green on a separate line with the label Aggregation. Rollover the value to display the aggregation type: Avg., Min., Max., or Sum. Column filtering is not supported on reports with aggregated columns.
Table: Array Performance by RAID Group
Column name | Description |
|---|---|
|
Storage Array |
Array name. |
|
RAID Group |
RAID group name. |
|
Performance |
Either Fast, Normal, or Slow, based on the performance index calculation for the LUN using the last baseline profile ranges for Fast and Slow performance; takes into account the worst performance of a LUN in the RAID Group. Each of these performance states are represented by a colored dot as shown in the legend at the top of the report. |
|
RAID Type |
RAID type. |
|
Drive Type |
Drive type, such as SAS or SATA. |
|
Drive Speed |
Drive speed in RPM. |
|
Drive Form |
Drive enclosure. |
|
# LUNs |
# of LUNs with drilldown to Array Performance by LUN. See Array Performance by LUN . You can also click the LUN name to show the details. See LUN Details . |
|
Response (ms) |
I/O response time = the average response time for all read and write operations (average I/Os). Response-time metrics are not available for Dell Compellent, EMC Symmetrix, IBM SVC, or HP 3PAR arrays. |
|
Max Read |
Identifies the LUN in the group with the longest read response time. This is the highest response time for a single LUN, from all the LUNs in the group. This can be used to identify the LUN with a performance problem. |
|
Max Write |
Identifies the LUN in the group with the longest write response time. This is the highest response time for a single LUN, from all the LUNs in the group. This can be used to identify the LUN with a performance problem. |
|
Avg Total |
Average of the average response times. |
|
Avg Read |
Average of the average response times (for the LUNs in the RAID Group) during the specified interval in milliseconds. Response-time metrics are not available for Dell Compellent, EMC Symmetrix, IBM SVC, or HP 3PAR arrays. |
|
Avg Write |
Average of the average response times (for the LUNs in the RAID Group) during the specified interval in milliseconds. Response-time metrics are not available for Dell Compellent, EMC Symmetrix, IBM SVC, or HP 3PAR arrays. |
|
Throughput IO/sec |
Average Read IOs/sec + Average Write IOs/sec. |
|
Max Read |
Identifies the LUN in the group with the largest read throughput (IOs/sec). This is the largest value for a single LUN, from all the LUNs in the group. This can be used to identify the LUN with a performance problem. |
|
Max Write |
Identifies the LUN in the group with the largest write throughput (IOs/sec). This is the largest value for a single LUN, from all the LUNs in the group. This can be used to identify the LUN with a performance problem. |
|
Avg Total |
Sum of the throughput (IOs/sec) averages. |
|
Avg Read |
Sum of the average Read IOs for the interval/length of interval in seconds. |
|
Avg Write |
Sum of the average Write IOs for the interval/length of interval in seconds. |
|
Max Read |
Identifies the LUN in the group with the highest read transfer rate. This is the highest read transfer rate for a single LUN, from all the LUNs in the group. This can be used to identify the LUN with a performance problem. |
|
Max Write |
Identifies the LUN in the group with the highest write transfer rate. This is the highest write transfer rate for a single LUN, from all the LUNs in the group. This can be used to identify the LUN with a performance problem. |
|
Avg Total |
Average of the average total transfer rates for the LUNs in the group. |
|
Avg Read |
Average of the average read transfer rate for the LUNs in the group, for the interval/length of interval in ms. |
|
Avg Write |
Average of the average write transfer rate for the LUNs in the group, for the interval/length of interval in ms. |
|
Cache Hits/sec Read |
Total Read Hits for interval/length of interval in seconds. |
|
Cache Hits/sec Write |
Total Write Hits for interval/length of interval in seconds. |