HP XP Performance Advisor Software - Manual (Page 208)

Viewing 10 busiest LDEVs and Ports
To
view the 10 busiest LDEVs or ports associated with an XP or an XP7 disk array's frontend
activities,
click FrontEndIO in the component selection tree for the XP/XP7 disk array. The top 10
busiest
LDEVs are displayed under the LDEV tab and the top 10 busiest ports are displayed under
the
Ports tab. This data is also displayed when you click the Frontend Total Avg group box under
the
Performance View tab.
If the number of busiest LDEVs or ports are less than ten or if their utilization is zero, only the busiest
components are displayed. The 10 busiest LDEVs selected is based on the I/Os and 10 busiest
ports selected is based on the average I/Os.
The LDEV response time metrics, MAX READ RESP and MAX WRITE RESP (msec) are measured as
the maximum response time over the last 30 secondss of the collection interval. For example, if
your collection interval for RAID group is set to 5 minutes, the MAX value is calculated over the
last 30 seconds of the 5 minute collection interval. The AVG READ RESP and AVG WRITE RESP
(msec) are measured as the average response time calculated over the entire collection period.
For example, if RAID group collection interval is set to 5 minutes, the Average Response Time is
calculated over the entire 5 minutes collection period. Click an LDEV ID or port ID to view the
performance graphs for all the associated metrics in a chart window. To know more about charts,
see
“Plotting charts” (page 234) .
IMPORTANT:
•
The response time is calculated from the time the I/Os are received by the CHA port till the
time they are dispatched from the CHA port.
•
If the LDEV is a LUSE Master, the details of individual LDEVs are considered for the busiest
components and not the sum of all the individual LDEVs.
•
The Maximum Port IO is the maximum of the last collection time stamp. For example, if port
I/O collection interval is set to two minutes, the Maximum Port I/O will be calculated as the
maximum value over the two minute collection period.
•
The
port type, such as FCoE (applicable for P9500/XP7 disk arrays) is also displayed for the
respective
port ID.
Figure 21 10 busiest front end LDEVs
Figure 22 10 busiest front end Ports
208 Viewing XP and XP7 disk array components