Which HP 3PAR StoreServ software gives the customer the ability to specify a minimum number
of IOPs for a volume set?
A.
HP 3PAR StoreServ Dynamix Optimization
B.
HP 3PAR StoreServ Performance Advisor
C.
HP 3PAR StoreServ Adaptive Optimization
D.
HP 3PAR StoreServ Enhanced Priority Optimization
Explanation:
HP 3PAR Adaptive Optimization and QoS can cooperate, but HP 3PAR Adaptive Optimization
data migration may impact latency goal settings. For example, when a workload is partially
migrated from Fibre Channel drives into NL ones after the collection and analysis of the I/O access
pattern by HP 3PAR Adaptive Optimization, depending on the host access I/O pattern, this may
have a negative impact on latency and trigger workloads to be throttled towards their in goal. This
is an expected behavior if the QoS rule was modeled after the Fibre Channel performance.
D
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In HP 3PAR OS 3.1.2 MU2, Priority Optimization (quality of service [QoS]) offered the ability to set a maximum limit of IOPS or bandwidth available to a VVset.
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C
Adaptive Optimization Enhancements in HP 3PAR OS 3.1.3
Ability to specify minimum number of IOPs – If users deploy AO and then do
not use the application, the regions used will be identified as idle and moved to
the nearline tier. To prevent this from happening, a new option has been added
to the startao command. The –min_iops option allows users to specify the
minimum number of IOPs needed to trigger analysis on a given aocfg. If the
aocfg is idle, no data is actually moved.
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C – I agree that it is C because it is asking for “…the ability to specify a minimum number of IOPs for a volume set?” It is not asking about configuring the maximum number.
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HP 3PAR OS 3.1.3 introduces the concepts of a min goal, a priority level (high,normal, and low), and a latency goal per QoS object along with the ability to set QoS rules against Virtual Domains. The min goal is the minimum amount of IOPS or
bandwidth below which the QoS subsystem will not throttle a given QoS object in order to meet the latency goal of a higher priority workload. If system resources are available, VVsets or Virtual Domains may consume more IOPS or bandwidth than
the min goal but will be throttled if they reach their max limit. The performance may also go below the min goal; this may happen if the application is not pushing enough IOPS or if the sum of all min goals defined is higher than the I/O capability of the system or a given tier of storage.
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