HP StorageWorks P9000 Performance Advisor Software v5.3 User and Troubleshooting Guide (T1789-96322, August 2011)

DescriptionMetricsCat-
egory
RG Seq Reads (IOPS) (Avg Seq Reads), RG NonSeq Reads (IOPS) (Avg
NonSeq Reads), RG Writes (IOPS) (Avg Writes): Average of the frontend
sequential and random I/Os on an individual RAID group in the XP or
the P9000 disk array backend.
Combined Backend Transfers (IOPS), which is derived as follows:
• If any of the physical LDEVs from a RAID group is configured in a ThP
pool, the sum of the backend transfer on all the V-Vols in that pool
will be shown as combined backend transfer for that RAID group.
• If any of the physical LDEVs from a RAID group is configured in multiple
ThP pools, the sum of the backend transfer on all the ThP pools will
be shown as combined backend transfer for that RAID group. * is
displayed beside the combined backend transfer value to indicate the
same.
The backend transfer of each ThP pool is the sum of backend transfer
on V-Vols belonging to that ThP pool.
For example, consider that physical LDEVs 0:00 and 0:01 from RG_1
are contributing to ThP_Pool_1 and 0:02 from RG_1 is contributing
to ThP_Pool_2. If the backend transfers on ThP_Pool_1 is 50 I/Os and
ThP_Pool_2 is 90 I/Os, the combined backend transfer on RG_1 is
140 I/Os.
• If physical LDEVs from multiple RAID groups are configured in a ThP
pool, the combined backend transfer will be reported as an aggregate
value for all the RAID groups. * is displayed beside the combined
backend transfer value to indicate the same.
For example, consider that physical LDEVs 0:00 from RG_1 and 1:00
from RG_2 are contributing to ThP_Pool_1. If the backend transfers
on ThP_Pool_1 is 60 I/Os, the combined transfer on RG_1 and RG_2
is 60 I/Os each.
Avg RG Util (%): Overall utilization of individual RAID groups.
Avg DKA Pair Util (%): Overall utilization of the individual MPs on each
installed DKA pair.
NOTE:
In a 100% ThP environment, the Dashboard Backend metrics show
zero values for an XP or a P9000 disk array. This is because, the
I/O per second data and the MB/second data throughput is on the
V-Vols rather than the pool LDEVs in a RAID group. To view backend
transfers on such RAID groups, refer to the corresponding combined
backend transfer values.
If you want to view the ThP pool RAID group utilization for a RAID
group, go to Charts > THP Pool main category, select a RAID group
and plot the RAID group utilization graph (RG Util (%) metric.
RG Seq Reads (IOPS)
(Avg Seq Reads), RG
NonSeq Reads (IOPS)
(Avg NonSeq Reads),
RG Writes (IOPS) (Avg
Writes), and Avg RG
Util (%), Avg DKA Pair
Util (%), and
Combined Backend
Transfer (IOPS)
Backend
Avg MP Blade Util (%): Average utilization of the individual installed MP
blades.
Avg MP Blade Util (%)
MP
Blade
Monitoring performance of XP and P9000 disk arrays134