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

DescriptionPerformance View screen ele-
ments
Displays the overall average
sequential and non-sequential
reads, and writes for an ACP pair.
For more information, see “Viewing
ACP/DKA data” on page 220.
In addition, the combined backend
transfer value is displayed (only for
XP24000 and P9000 disk arrays),
which is the sum of backend
transfers happening on all the ThP
pools served by a particular DKA.
In a thin provisioning environment,
the Combined BT section in the ACP
Pair Backend group box displays
values based on the following:
• If a ThP pool is associated with
one DKA, the backend transfers
on the ThP pool are reported as
combined backend transfer for
that DKA.
• If the ThP pool is served by mul-
tiple DKAs, the backend trans-
fers on the ThP pool are repor-
ted as combined backend
transfers for each of the DKAs
serving that ThP pool. Such
DKAs are also identified by a
*.
For example, consider that
ThP_Pool_2 is served by DKA_1
and DKA_2. If the ThP pool
backend transfer is 50 I/Os, the
combined backend transfer of
DKA_1 and DKA_2 is reported
as 50 I/Os each.
• If a DKA is serving multiple ThP
pools, the combined backend
transfers of the DKA is reported
as the sum of backend transfers
on all the associated ThP pools.
For example, consider that
ThP_Pool_1 is served by DKA_1
and DKA_2, and ThP_Pool_2 is
served by only DKA_1. If the
combined backend transfers on
ThP_Pool_1 is 50 I/Os, and
ThP_Pool_2 is 30 I/Os, the
combined backend transfers of
DKA_1 is 80 I/Os (sum of the
backend transfers on
ThP_Pool_1 and ThP_Pool_2),
and DKA_2 is 50 I/Os (sum of
the backend transfers on
ThP_Pool_1).
ACP Pair Backend group box
HP StorageWorks P9000 Performance Advisor Software User Guide 209