HP P9000 Command View Advanced Edition Suite Software 7.3.1-00 User Guide

Smart pool volume, the external Smart pool volume can be defined according to performance.
Users can directly specify an LDEV to create THP pools. After creating the THP/Smart pools, users
can create a volume from the created THP/Smart pools, or allocate a THP/Smart volume to a host
by specifying THP/Smart pools.
• Expanding THP/Smart pools (converting from THP pools to Smart pools) allows expansion of the
THP/Smart pools and increases the pool capacity or changes the THP pools in operation to Smart
pools.
• Shrinking THP/Smart pools allows shrinkage of the THP/Smart pools when the free capacity is
too large compared to the used capacity of the THP/Smart pools.
• Reclaiming unused zero pages for THP/Smart pools releases unused capacity. If THP/Smart pools
include zero pages, usability worsens because the system tries to use more capacity than is actually
needed. In such cases, you can reclaim zero pages in THP/Smart pool volumes. In addition to
reclaiming zero pages periodically, you can reclaim zero pages when performing a backup or
restoring data from tape storage.
• Monitoring Smart pools and replacing data in Smart pools can be set to execute automatically
by specifying a time or interval in advance, or you can manually execute at a time of your choice
according to the requirements of your work.
• Editing a tiering policy for Smart volumes, automatically places data that has a high frequency of
I/O operations preferentially in a high-speed hardware tier. To avoid this and to ensure that data
with high importance, but with fewer I/O operations, is placed in a hardware tier that maintains
a certain speed at all times, you can fix the target hardware tier.
• Editing a tier rank for an external Smart pool volume, when an external volume is included in a
Smart pool volume that is one of the volumes making up a Smart pool, you can define the external
LDEV tier rank (as high, medium, or low) according to the performance.
The following operations are possible if a Tiered Storage Manager license has been registered:
• You can use the Mobility tab to evaluate and analyze the operation status for a THP/Smart pool.
• You can set a schedule for relocating data and monitoring a Smart pool by registering the time
for Smart pool monitoring and data replacement as a template schedule.
• You can prevent tier relocation for Smart volumes by configuring whether data can be relocated
for each Smart volume. Data relocation can be controlled according to characteristics and the
operating status of the applications using Smart volumes, such as by preventing other applications
from relocating data of the volumes they are using when there is an application for which data
relocation takes a high priority.
• You can restore a data placement by applying a data placement profile for Smart volumes.
This means users can restore a past data placement by saving data placements of optimized Smart
volumes per page as profiles, and applying them according to operation. For example, if a Smart
volume is being used for multiple operations that have different access characteristics (such as
online and batch processing), users can create data placement profiles that fit the different pro-
cesses, and apply the appropriate profile before beginning processing. By doing so, users can
restore a data placement that fits the characteristics of the target processing in advance, which
prevents I/O performance from dropping. In addition, by setting up a schedule, users can update
and apply profiles at regular intervals to suit the operation of applications. When creating and
applying profiles, users need to keep the following in mind:
• After the monitoring and data relocation of Smart pools are performed, a data placement is
restored. Therefore, users need to determine the timing at which to apply a profile by taking
into account the period during which the monitoring and data relocation are performed.
• Profiles are applied only to pages placed in Tier 1 of Smart pools. For pages to which both a
data placement profile and tiering policy are set, the settings of the profile are prioritized.
• The data placement profile task takes time to complete after it is executed. This time might affect
other operations, so make a plan based on the displayed time estimate. Keep in mind that the
Setting up and operating a SAN environment44