HP XP P9000 Performance Advisor Software - Manual (Page 228)

Column Head Column Head
Total random and sequential frontend read and write MBs on the journal
LDEV during the entire collection interval.
LDEV MB/s - Frontend
Total random and sequential frontend read and write I/Oss on the journal
LDEV during the entire collection interval.
LDEV I/Os - Frontend
Average read response time of all the journal LDEVs created in a specified
RAID group over the entire data collection interval.
Avg Read Resp (msec)
Maximum read response time of all the journal LDEVs created in a specified
RAID group over the last 30 seconds of the collection interval.
Max Read Resp (msec)
Viewing 10 busiest LDEVs and Ports
To view the 10 busiest LDEVs or ports associated with an XP or a P9000 disk array's frontend activities,
click FrontEndIO in the component selection tree for the XP or the P9000 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 ” on page 262.
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 com-
ponents 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 Fibre, Ficon, Escon, or FCoE (applicable only for P9000 disk arrays) is also
displayed for the respective port ID.
Viewing XP and P9000 disk array components 228