View Top10 - Frontend Io - HPE XP7 User Manual

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% RGUtil Sequential Write
% RGUtil Sequential Write Party
Overall % RG utilization
View Top10 – Frontend IO
The Top 10 – Frontend IO summary provides details of the ten busiest LDEVs and ports associated with
an XP or an XP7 disk array's frontend activities.
NOTE: 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 seconds 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.
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.
Description
The sequential write utilization percentage for a RAID Group.
The sequential write parity utilization percentage for a RAID
Group.
The overall percentage utilization of a RAID Group, which is the
sum of the random reads, random writes, random write parity,
sequential reads, sequential writes, and the sequential write
parity.
View Top10 – Frontend IO 197