Hitachi Command Suite 8 User Guide

							HDT pool, click Add to Pool, and click Close. The Tier Configuration
table in Pool Summary shows the new tier configuration status for
each tier.
4. Click  Show Plan  and confirm that the information in the plan summary
is correct. If changes are required, click  Back.
5. (Optional) Update the task name and provide a description.
6. (Optional) Expand  Schedule to specify the task schedule. You can
schedule the task to run immediately or later. The default setting is  Now.
If scheduled for  Now, select  View task status  to monitor the task after
it is submitted.
7. Click  Submit . If the task is to run immediately, the task begins.
8. You can check the progress and the result of the task on the  Tasks &
Alerts  tab. Click on the task name to view details of the task.
Result
When the task is complete, the DP pools are expanded. You can verify the updated information on the DP Pools list.
Related concepts
•
About virtualizing storage capacity  on page 160
Related tasks
•
Shrinking a DP pool  on page 171
•
Expanding DP volumes  on page 173
•
Reclaiming zero pages  on page 174
Shrinking a DP pool Shrinking a DP pool allows the recovery of excess free capacity.
Procedure 1. On the  Resources  tab, select  Storage Systems  in the navigation tree.
2. Expand the tree for the target storage system that includes the DP pool
you want to shrink, and select it in  DP Pools.
3. In the  DP Pool Vols  tab, select DP pool volumes, and then click  Shrink
Pool .
4. Review the plan and specify additional information, as appropriate:
• Verify the information that is displayed.
• Enter a name in  Task Name.
• Specify when to execute the task.
5. Click  Submit .
The plan is registered as a task.
6. On the  Tasks & Alerts  tab, confirm that the task completed.
7. In the  Storage Systems  tree, return to the target storage system, click
DP Pools , and confirm that the information is updated.
Provisioning storage171Hitachi Command Suite User Guide 
						

							Related concepts
•
About virtualizing storage capacity  on page 160
Related tasks
•
Expanding DP pools  on page 169
Modifying DP pool settings After setting up a DP pool, you can modify DP pool settings.
Procedure 1. On the  Resources  tab, select  DP Pools under the target storage
system.
2. From the list of DP pools, select the pool you want to modify and click
Edit Pool .
3. Modify the settings as appropriate and click  Submit.
4. On the  Tasks & Alerts  tab, confirm that all tasks are completed.
5. In the  Storage Systems  tree, return to the target storage system and
click  DP Pools  to confirm that the information is updated.
Related concepts
•
About virtualizing storage capacity  on page 160
Related tasks
•
Creating a DP pool  on page 162
Deleting DP pools After unallocating the DP volumes belonging to a DP pool, you can delete theDP pool.
Note:  When you remove an encrypted DP pool in HUS 150 systems, this
cancels the encryption for all drives that comprise the target DP pool, and releases the encryption on all DP pool volumes in the DP pool.
Prerequisites
Before you delete DP pools, first unallocate the DP volumes that belong to the DP pools to be deleted.
Note:  When you delete a DP pool, HCS automatically performs an immediate
quick format only on those volumes that were DP pool volumes, but became basic volumes because the associated DP pools were deleted. This allows
these basic volumes to be used again. A best practice for deleting a pool is to
run this task when system activity is low and major system operations are
not running.172Provisioning storageHitachi Command Suite User Guide 
						

							Procedure1. On the  Resources  tab, select  Storage Systems .
2. Expand the tree, select the target storage system, and select  DP Pools.
3. From the list of pools, select one or more target DP pools to delete, and
click  Delete Pools .
4. In the  Delete Pool  dialog box, confirm that the information matches the
DP pools to be deleted. Optionally, update the task name and provide a description.
5. Click  Submit .
The delete DP pools process begins.
6. You can check the progress and the result of the delete DP pools task on
the  Tasks & Alerts  tab
Verify the results for each task by viewing the details of the task.
Result
The deleted DP pool no longer appears in the DP pool list for the target storage system.
Related concepts
•
About virtualizing storage capacity  on page 160
Related tasks •
Creating a DP pool  on page 162
Related references
•
Notes on performing quick formats  on page 140
Expanding DP volumes You can expand the size of a DP volume to expand its capacity.
Procedure 1. On the  Resources  tab, select Storage Systems  in the navigation tree.
2. Expand the tree for the target storage system that includes the pool you
want to modify, and select the DP pool in  DP Pools.
3. On the  DP Vols  tab, select one or more volumes you want to expand
and click  Expand DP Volume .
4. Specify the new capacity for the volume.
5. Click  Submit .
6. On the  Tasks & Alerts  tab, confirm that all tasks are completed.
7. In the  Storage Systems  tree, return to the target storage system, click
the target DP pool and view the  DP Vols tab to confirm that the
information is updated.
Provisioning storage173Hitachi Command Suite User Guide 
						

							Related concepts
•
About virtualizing storage capacity  on page 160
Related tasks
•
Expanding DP pools  on page 169
Reclaiming zero pages Reclaiming unused zero pages for a DP pool releases unused capacity.
Procedure 1. On the  Resources  tab, select Storage Systems  in the navigation tree.
2. Expand the tree for the target storage system that includes the
appropriate DP pool, and select the DP pool in  DP Pools.
3. On the  DP Vols  tab, select one or more volumes and click  Reclaim Zero
Pages .
4. Click  Submit .
5. In the task list, confirm that the task is completed.
Related concepts
•
About virtualizing storage capacity  on page 160
Related tasks
•
Expanding DP pools  on page 169
Changing an access attribute to read/write
Prerequisites
Before changing the access attribute from read-only or protect to read/write, considering the following:
• Do not assign an access attribute to a volume if any job is manipulating data on the volume. If you assign an access attribute to such a volume,
the job will possibly end abnormally.
• Make sure that the retention term is expired. If expired, the Retention Term column in the  Data Retention window shows 0. To change the
access attribute to read/write within the retention term, contact customer
support.
• Make sure that Expiration Lock indicates Disable > Enable. If it indicates Enable > Disable, changing to read/write is restricted by an administrator
for some reason. Contact the administrator of your system to ask if you
can change the access attribute.
See the  Hitachi Virtual Storage Platform G1000 Provisioning Guide for
Open Systems .
174Provisioning storageHitachi Command Suite User Guide 
						

							Procedure1. On the  Resources  tab, expand the  Storage Systems  tree, right-click
the target storage system, and then select  Other Functions.
2. Click  Actions > Other Functions > Data Retention  to open the Data
Retention  window.
3. Click 
 to change to modify mode.
4. Select an LDKC number in the  LDKC list, select a group that the CU
belongs to in the  CU Group list, and then click a CU in the tree.
5. Right-click a volume for which you want to change access attributes. You
can select multiple volumes, select  Attribute, and then click  Read/
Write .
6. Click  Apply  to apply the setting.
Related references •
Create Pool dialog box  on page 164
Virtualizing storage tiers (HDT) This module describes how to manage data relocation for HDT volumes.
About virtualizing storage tiers Dynamic Tiering functionality lets you configure the monitoring frequency
modes at which data is accessed and relocate that data in a specific pool and tier based on the results.
For example, you might create a pool that combines volumes having different
cost performances, such as combining high-speed volumes (SSD, FMD, or
SAS) with inexpensive low-speed volumes (SATA). The data in this pool is
then automatically relocated among the volumes depending on the I/O load:
• High-load pages are allocated to high-speed volumes
• Low-load pages are allocated to low-speed volumes
By using Hitachi Command Suite, you can fine-tune settings related to the
monitoring of HDT pools and data relocation depending on operating conditions.
You can configure a tiering policy in an HDT pool so that parity groups are assigned to specific tiers (Tier 1, Tier 2, and Tier 3) to take advantage of
drive types, drive speeds, chip types, and RAID levels to optimize your
performance and capacity needs. Tiering allows data in a host volume to be
spread across multiple tiers (Tier 1 for high-speed, Tier 2 for next highest
speed, and Tier 3 for additional capacity independent of drive type or RAID level), which provides the flexibility to specify settings that address your
business conditions or the characteristics of certain applications. Tiering
Provisioning storage175Hitachi Command Suite User Guide 
						

							allows you to optimize data placement, improve volume performance, andreduce costs through more effective use of your resources.
HDT settings that can be specified using HCS include:
• Monitoring HDT pools and relocating data Monitoring and data relocation can be configured to run automatically by
specifying a time or interval in advance, or you can manually monitor and relocate data as required. For a VSP G1000, a data relocation speed can
be set. For example, using a slower relocation speed will reduce the impact of relocation on other I/O requests.
• Specifying the buffer space for HDT pools When HDT pools are created or edited, on each hardware tier you can
specify a ratio corresponding to the buffer space for new page assignment
(an area reserved for increasing used capacity). Similarly, you can specify a ratio corresponding to the buffer space for tier relocation (a working area
reserved for the storage system to use when relocating data). However, be
aware that changing the default values might degrade performance.
• Applying a tiering policy and setting priority to HDT volumes You can regulate tiering to balance performance and cost, such as by
preventing more data than is necessary from being placed in a fast
hardware tier and thereby reducing management costs. After these settings are configured, regularly review the status of the settings of that
tiering policy and the amount of capacity in use by each hardware tier to
verify that resources are being appropriately allocated. Configuration settings can be changed any time if costs increase or performance is lower
than expected.
In an HDT pool, data with a high frequency of I/O operations is automatically preferentially placed in a high-speed hardware tier.Configure the following settings to control data placement, ensuring that important data is placed in a fast hardware tier, according to your business
requirements.
○ Apply a tiering policy
To ensure that data with high importance but with few I/O operations is
placed in a hardware tier that maintains a certain speed at all times, you can specify the target hardware tier. You can also apply a tieringpolicy to HDT volumes that determines the capacity ratio of each hardware tier, by defining such a policy in advance.
○ Specify a new page assignment tier
When HDT volumes are created or allocated, specify which hardware tier the new page of an HDT volume will be assigned with priority.
Among the hardware tiers defined by a tiering policy, specify High for an
upper-level hardware tier, Middle for a medium-level hardware tier, and
Low for a low-level hardware tier.
○ Set relocation priority176Provisioning storageHitachi Command Suite User Guide 
						

							When HDT volumes are created or allocated, specify whether toprioritize relocation of the data of the target HDT volumes.
• Editing a tier rank for an external HDT pool volume When an external volume is included in an HDT pool volume that is one of
the volumes making up an HDT pool, you can define the external LDEV tier rank (high, medium, or low) according to the performance.
A registered Tiered Storage Manager license enables the following:
• Evaluating and analyzing the operation status of HDT pools Use the Mobility tab to evaluate and analyze the operation status that isrelated to an HDT pool.
• Setting a schedule for relocating data and monitoring HDT pools Register the time of HDT pool monitoring and data replacement as atemplate schedule.
• Editing tier relocation for HDT volumes (preventing relocation by volume) Specify whether data can be relocated for each HDT volume. Tier
relocation can be controlled according to the characteristics and operating status of applications using HDT 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.
• Restoring a data placement by applying a data placement profile of HDT volumes
Restore a previous data placement by saving data placements of optimized HDT volumes per page as profiles, and applying them according to
operation. For example, if an HDT volume is being used for multiple
operations that have different access characteristics (such as online and
batch processing), you can create data placement profiles that fit the different processes and apply the appropriate profile before beginning
processing. By doing so, you 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, you can
update and apply profiles at regular intervals to suit the operation of
applications. Profiles are applied only to pages placed in Tier 1 of HDT
pools.
Related concepts
•
Creating a storage operating environment  on page 132
Related tasks
•
Manually starting or stopping the monitoring of HDT pools  on page 178
•
Manually starting or stopping the tier relocation of an HDT pool  on page
178
•
Scheduling monitoring and tier relocation of HDT pools  on page 179
•
Editing tier relocation for HDT volumes  on page 180
•
Applying a tiering policy to HDT volumes  on page 180
•
Customizing a tiering policy for HDT volumes  on page 181
Provisioning storage177Hitachi Command Suite User Guide 
						

							•Creating a data placement profile for HDT volumes on page 183
•
Updating a data placement profile for HDT volumes  on page 184
•
Editing a data placement profile for HDT volumes  on page 185
•
Applying a data placement profile for HDT volumes  on page 186
•
Scheduling data placement profiles for HDT volumes  on page 187
•
Editing an external LDEV tiering rank for an HDT pool  on page 187
Related references •
Notes on data placement profiles for HDT volumes  on page 182
Manually starting or stopping the monitoring of HDT pools You can start or stop monitoring of an HDT pool manually.
Prerequisites
A Tiered Storage Manager license is required to perform the operation from
the Mobility tab.
After confirming that the HDT pools setting for Tier Management is set to
Manual or Custom, you can start or stop monitoring of an HDT pool.
Procedure 1. From the tree view in the  Resources tab, select  Storage Systems  (or
use the  Mobility  tab).
2. Expand the tree and select  DP Pools under the target storage system.
3. Select one or more HDT pools and click either the  Start Monitoring or
Stop Monitoring  button, both found in the  More Actions menu.
4. Set the desired items and execute the task.
5. View the list of tasks to check execution results.
6. Click the link for the task name and check that monitoring of each HDT
pool has started or stopped.
Related concepts •
About virtualizing storage tiers  on page 175
Manually starting or stopping the tier relocation of an HDT pool You can manually start or stop tier relocation of an HDT pool.
Prerequisites
A Tiered Storage Manager license is required to perform the operation from
the Mobility tab.
After confirming the following, you can start relocation of an HDT pool:
• Existence of two or more hardware tiers in the target HDT pools
• The HDT pools setting for Tier Management is Manual or Custom
178Provisioning storageHitachi Command Suite User Guide 
						

							To stop relocation of an HDT pool, confirm:• The HDT pool setting for Tier Management is Manual or Custom
Procedure 1. From the tree view in the  Resources tab, select  Storage Systems  (or
use the  Mobility  tab).
2. Expand the tree and select  DP Pools under the target storage system.
3. Select one or more HDT pools and click either the  Start Relocation or
Stop Relocation  button.
4. Set the desired items and execute the task.
5. View the list of tasks to make sure that all tasks have completed.
6. Click the link for the task name and check that tier relocation of each
HDT pool has started or stopped.
Related concepts
•
About virtualizing storage tiers  on page 175
Scheduling monitoring and tier relocation of HDT pools You can specify the schedule for monitoring and relocating HDT pools.
Prerequisites
A Tiered Storage Manager license must be registered.
Procedure 1. From the  Mobility tab, select  DP Pools.
2. Expand the tree view and select the target storage system. From the list
of DP pools, select the HDT pool for which the schedule is to be set.
3. On the  Summary  panel, click  Actions, and select  Edit Pool.
4. In the  Edit Pool  dialog box, click  HDT Settings. In Tier Management
select the  Custom radio button. Click  Select Template to use an
existing schedule template, or click  Create Template to create a new
schedule template.
5. Specify the necessary items by following the instructions in the window
and create and execute the plan.
6. View a list of tasks to make sure that all tasks completed.
7. In the  Mobility  tab select the HDT pool. Then from  Tier Management
in  Summary  confirm the template names.
Related concepts
•
About virtualizing storage tiers  on page 175
•
About data mobility  on page 324
Provisioning storage179Hitachi Command Suite User Guide 
						

							Editing tier relocation for HDT volumesThere are conditions where it is useful to disable tier relocation of volumes to
prevent unnecessary data movement. For example, to preferentially perform
tier relocation of volumes whose I/O activity varies greatly, and suppress tier
relocation of other volumes.
Prerequisites
A Tiered Storage Manager license must be registered.
Procedure 1. Click the  Mobility tab, and select  Logical Groups  in the navigation
pane.
Logical Groups  can contain both  Public Logical Groups  and Private
Logical Groups . You can discover and register not only at the logical
group level, but also at the host or HDT volume level.Note:  If you want to register by host, you can start this process by
selecting the  Resources tab.
2.Expand the tree to select the target logical group from  Public Logical
Groups  or Private Logical Groups .
3. If you want to set all HDT volumes in the logical group at the same time,
select  Actions  located in the corner of the application pane, then  Edit
Tier Relocation . If you want to specify the target volumes, select one or
more HDT volumes from the list of volumes, and then click the  Edit Tier
Relocation  button.
4. Select  Enable  to enable tier relocation for HDT volumes. Select  Disable
to disable tier relocation.
5. Set any required items in the window, and then execute the task.
6. Verify that the task completed.
Result
The applied tier location settings can be checked from Summary or the list of
volumes, which are displayed by selecting a logical group from the Mobility
tab.
Related concepts
•
About virtualizing storage tiers  on page 175
Applying a tiering policy to HDT volumes
Prerequisites
• Two or more hardware tiers must exist in an HDT pool.
180Provisioning storageHitachi Command Suite User Guide