Hitachi Command Suite 8 User Guide

							DP pools are created by Device Manager, which automatically selects volumesbased on user-specified conditions. Users can also directly specify parity groups to create a DP pool.
Users can also specify settings such as values for the usage rate threshold and reservation threshold.
If you have registered a Tiered Storage Manager license, you can use the
Mobility tab to evaluate and analyze the operation status that is related to a DP pool. When you delete an unnecessary DP pool, DP volumes created fromthat pool are also deleted. For this reason, a prerequisite to deleting a DP
pool is that no DP volumes from that pool are allocated to a host.Tip:  For Virtual Storage Platform G1000 storage systems, you can restore DP
pools, complete SIMs, and export tier relocation log files by using the windows available by clicking the System GUI link. To access the System GUI
link, on the Resources tab, right-click DP Pools for the target storage system,
and then select System GUI from the menu. Or, click DP Pools for the target storage system, and then click the System GUI link that appears in the
application pane.
For information about how to perform tasks that are available by clicking System GUI, see the Help for the appropriate window, or see the  Hitachi
Virtual Storage Platform G1000 Provisioning Guide for Open Systems .
For Hitachi Unified Storage (HUS) 100 family of storage systems, the
replication data and replication management area, which are used by Copy- on-Write Snapshot or TrueCopy Extended Distance, are stored in the created
DP pool.
Related concepts •
Creating a storage operating environment  on page 132
Related tasks
•
Creating a DP pool  on page 162
•
Verifying DP pool information  on page 168
•
Expanding DP pools  on page 169
•
Shrinking a DP pool  on page 171
•
Modifying DP pool settings  on page 172
•
Deleting DP pools  on page 172
•
Expanding DP volumes  on page 173
•
Reclaiming zero pages  on page 174
Related references •
Create Pool dialog box  on page 164
Provisioning storage161Hitachi Command Suite User Guide 
						

							Creating a DP poolYou can create an HDP or HDT pool, which provides more efficient use ofphysical storage for virtual volumes that are allocated to hosts from the DPpool. DP pool performance can be improved if you use the entire capacity of a
parity group for a single DP pool.
Prerequisites
• Register the target storage system. • When defining an external LDEV tier rank, externally connect a storage system that has multiple performance levels.
• Verify the following when using Hitachi USP V/VM, Virtual Storage Platform, Virtual Storage Platform G1000, or HUS VM for DP pools:
○ Parity groups from which volumes have already been created can be
added
○ Drive type characteristics (for example: drive type and drive speed) in
parity groups and RAID level
• Verify the following when using Hitachi Unified Storage (HUS) 100 and the Adaptable Modular Storage (AMS) 2000 family of storage systems for DP
pools:
○ Drive type and RPM (only drives in which a parity group has not been
created can be targets)
○ Parity group RAID level and capacity
○ Number of parity groupsNote:  In HDT pools, if different drive types and/or RAID levels are mixed in a
single tier, they will all be considered equal for data placement regardless of page access frequency. As a result, I/O performance will be dependent on the
drive type characteristics and RAID level on which any given page resides.Note:  In HDP pools, if different drive types and/or RAID levels are mixed in
an HDP pool, I/O performance will be dependent on the drive type
characteristics and RAID level on which any given page resides.
Procedure
1. On the  Resources  tab, expand the storage system, list existing  DP
Pools , and click  Create Pool .
2. In the  Create Pool  dialog box, specify a pool name, and optionally select
Reflect this pool name to the storage system .
3. To configure an HDP pool, select a  Pool Type of HDP  and configure the
following:
a. In the  Additional Parity Groups  table, click Add Parity Groups .
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							b.(Optional) Select 'Allow to mix different drive types/speeds, chip
types, RAID levels or volume locations' to allow combining resources
with different characteristics.
c. Select one or more parity groups, and click  Add to Pool and then
Close . The Pool Summary  information is updated.
d. (Optional) Click  Advanced Options  to configure Pool ID, Used
Threshold, Subscription Thresholds, and DP volume protection options,
as needed.
e. Go to step 7.
4. To configure an HDT pool, select a  Pool Type of HDT , and then in the
Additional Parity Groups  table, choose Standard or Mixed  mode to
disallow or allow combining resources with different characteristics. For
Mixed  mode, go to step 6.
5. For a  Standard  mode HDT pool, do the following:
a. Click  + to add a new tier.
b. In the  Add New Tier  dialog box, select a volume to configure Tier 1,
and click  Select. The Tier Configuration  table in Pool Summary  is
updated.
c. Click  Add Parity Groups , select the parity group, click  Add to Pool,
and click  Close. Select an available parity group that best meets your
performance or capacity needs (Tier 1 for best performance, Tier 2 for next best performance, and Tier 3 for capacity).
d. (Optional) Click  + to add Tier 2 and Tier 3, configure the tiers based
on your performance and capacity needs using the choices in  Add
New Tier  dialog box. The Tier Configuration table in Pool Summary is
updated.
Tip:  To delete an existing tier, click  X in the  Tier tab.
e.Click  Advanced Options  to configure Pool ID, Used Threshold,
Subscription Thresholds, and DP volume protection options, as needed.
f. Click  HDT Options , and configure the tier management options as
needed.
g. Go to step 7.
6. For a  Mixed  mode HDT pool, do the following:
a. Click  Add Parity Groups .
Note: There are two parity group tab choices from which you can
select:  Internal Parity Groups  and External Parity Groups  (the
Internal Parity Groups  tab is set by default). If you select the
External Parity Groups  tab and select one or more parity groups,
this enables the  External LDEV Tier Rank  menu from which you
must choose a ranking for the tier.Provisioning storage163Hitachi Command Suite User Guide 
						

							b.For mixed mode in the  Internal Parity Groups  tab or the External
Parity Groups  tab, select parity groups that you want to add to the
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.
c. Click  Advanced Options  to configure Pool ID, Used Threshold,
Subscription Thresholds, and DP volume protection options, as needed.
d. Click  HDT Options , and configure the tier management options as
needed.
e. Go to step 7.
7. Click  Show Plan  and confirm that the information in the plan summary
is correct. If changes are required, click  Back.
8. (Optional) Update the task name and provide a description.
9. (Optional) Expand  Schedule to specify the task schedule. You can
schedule the task to run immediately or later. The default setting is  Now.
10. Click Submit . If the task is to run immediately, the task begins.
11. 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
Created pools are added to the target storage system DP Pools list.
Related concepts•
About virtualizing storage capacity  on page 160
Related tasks
•
Verifying DP pool information  on page 168
•
Modifying DP pool settings  on page 172
•
Deleting DP pools  on page 172
Related references
•
Create Pool dialog box  on page 164
Create Pool dialog box Pools can be created for storage systems that support HDP. In addition, HDT
pools of differing performance levels can be used to improve application
performance.
When you enter the minimum required information in this dialog box, the
Show Plan button activates to allow you to review the plan. Click the Back button to modify the plan to meet your requirements.
The following table describes the dialog box fields, subfields, and field
groups. A  field group  is a collection of fields that are related to a specific
action or configuration. You can minimize and expand field groups by clicking the double-arrow symbol (>>).
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							As you enter information in a dialog box, if the information is incorrect, errors
that include a description of the problem appear at the top of the box.
Table 5-4  Create Pool dialog boxFieldSubfieldDescriptionStorage
System-Displays the selected storage system name, or prompts you to select the
storage system from a list.Pool Name-Accept the default pool name, or enter a pool name. Do not confuse pool name
with pool ID. The pool ID is an assigned number, the pool name is a user-
definable value.
Reflect a pool name to the storage system is selected by default, and provides
naming consistency between HCS and the storage system. If it is not displayed,
it does not apply to the selected storage system.Pool TypeHDP or HDTIf Pool Type with HDP and HDT options is displayed, the selected storage system
supports both HDP and HDT. If Pool Type options are not displayed, it means the
selected storage system only supports HDP.
Select HDP to create a pool using one or more parity groups.
Select HDT to create a pool using one or more tiers, each with one or more
parity groups. The HDT pool type offers two mode option choices, Standard or
Mixed , and HDT options can be minimized or expanded at the bottom of the
dialog box.Pool Summary-Pool Summary information is updated as parity groups are selected (number of
parity groups, DP pool capacity, used % (for thresholds 1 and 2), andsubscription % (that trigger subscription warnings and limits).
When pools are configured, use Advanced Options to set the Used Thresholds 1 and 2, and the Subscription thresholds for warnings and limits.
For HDP, Pool Configuration displays the physical attributes of the pool,
including volume location, drive type, drive speed, chip type, RAID level, number of parity groups, and parity group capacity.
For HDT, Tier Configuration displays the attributes of one or more tiers,including tier number (1-3), volume location (internal/external), drive type,
drive speed, chip type, external LDEV tier rank, number of parity groups, and parity group capacity.Additional
Parity Groups-(Information in the Additional Parity Groups table differs depending on the
selected pool type.)
For an HDP pool, this table displays parity group, drive type, drive speed, chip type, RAID level, total capacity, unallocated capacity, free capacity, number of
available volumes, external storage system, and external storage model.
For an HDP pool, you can select Allow mixing of different drive types/speeds,
chip types, RAID levels, or volume locations to create pools using parity groups
with different attributes.
Click Add Parity Groups to add one or more parity groups to a pool, and click
Close to review the selected parity groups. Click Remove Parity Groups to remove any parity groups from the list.
For an HDP pool, the Available Parity Groups table lists parity group, drive type,
drive speed, chip type, RAID level, total capacity, unallocated capacity, free
capacity, number of volumes, CLPR, cache mode, and resource group.Provisioning storage165Hitachi Command Suite User Guide 
						

							FieldSubfieldDescriptionFor an HDT pool, when the Internal Parity Groups tab is selected, the Available
Parity Groups table lists parity group, drive type, drive speed, chip type, RAID level, total capacity, unallocated capacity, free capacity, number of volumes,
CLPR, cache mode, and resource group. When the External Parity Groups tab is
selected, the Available Parity Groups table lists parity group, total capacity,
unallocated capacity, free capacity, number of volumes, CLPR, external storage
system, external storage model, cache mode, and resource group. If the
External Parity Groups tab is selected and you select one or more parity groups,
the External LDEV Tier Rank menu is enabled from which you must choose a
ranking for the tier.
For an HDT pool, select from two mode option choices; Standard (single drive type/speed, chip type, RAID level, and volume location in a single tier) or Mixed(mixed drive types/speeds, chip types, RAID levels, and/or volume locations in a
single tier). The selected mode affects the available parity groups you can add to pools in each tier to best meet your performance or capacity needs (Tier 1 forbest performance, Tier 2 for next best performance, and Tier 3 for capacity).
(For Standard mode) Click + to display the Add New Tier dialog box that displays volume location, drive type, drive speed, and external LDEV tierranking. Select a volume to add to the tier (for example, Internal, SAS, 15000
RPM), and click Select to update Tier Configuration with the selected volume and drive information, and create a Tier 1 tab. On the Tier 1 tab, use Add Parity
Groups to add parity groups to this tier. Click + to create Tier 2, and again to create Tier 3.
(For Mixed mode) Click Add Parity Groups, select parity groups from Internal
Parity Groups or External Parity Groups tab (for example: select the check box
for the title row in Internal Parity Groups, click Add to Pool, and click Close). The
Tier Configuration table in Pool Summary displays the new status for each configured tier.
Note the following important items regarding HDT configuration:
• HCS automatically arranges your tiers from highest performance (Tier 1) to lowest performance (Tier 3), regardless of the order used when creating
tiers. For example, if Internal, SAS, 15000 is the tier created, but it is the
highest performance tier, then Internal, SAS, 15000 is displayed as Tier 1.
• When three tiers are defined, the + tab is no longer displayed because there is a three-tier limit. To delete a tier, click X in the tier tab. When the + tab
displays, you can define a new tier. Create new tiers and delete existing tiers
as required.>> Advanced
OptionsPool IDAccept the default pool ID number, or choose from the options in the menu. Use
Show Pool ID Usage to display pool ID number and names that are currently in
use.Used Threshold 1Set the level of physical capacity usage as a percentage (1-100 range) of the
physical DP pool capacity. When this threshold is exceeded, it generates an
alert, an email, or both. Alerts display on the Dashboard and the Tasks & Alerts
tab.Used Threshold 2Same description as above.
Used Threshold 1 and 2 display in the Pool Summary, in both graphic and
numeric values.Subscription
Thresholds(Optional) Select Enabled to set subscription warning and limit thresholds.WarningExceeding the subscribed warning threshold (as a percentage of DP pool capacity) generates an alert, an email, or both. Warnings are generated when
volume allocation from a pool will exceed the warning level, but volume166Provisioning storageHitachi Command Suite User Guide 
						

							FieldSubfieldDescriptionallocation is still allowed (this is a soft limit). Alerts display on the Dashboardand the Tasks & Alerts tab.LimitExceeding the subscribed limit threshold (as a percentage of DP pool capacity)generates an alert, an email, or both. However, if volume allocation will exceed
the subscribed limit threshold, volume allocation is not allowed (this is a hard limit). You must either reduce the capacity of the volume you want created, or increase the subscription limit.Protect DP VOL
when:For the VSP G1000 storage system, this option is displayed when:
• The Data Retention Utility is licensed
• The storage system microcode version is 80-02-01-XX/XX or laterI/O fails to a full
Pool:Select 'Yes' to prohibit host I/O to one or more DP volumes in a DP pool that is full, where additional free space cannot be assigned. The displayed default (yesor no) is determined by values that have been set for the storage system.
See DP pools to verify the protection settings of the DP pool. For DP volumes, see the volume information summary in volume details, and select the Guardlink to verify that the protect attribute is assigned.
If host I/O to DP volumes is suspended, resolve the issue, and then change thevolume access attribute to read/write (see related topics).I/O fails to a
blocked Pool VOL:Select 'Yes' to prohibit host I/O to one or more DP volumes when a DP pool volume is blocked. The displayed default (yes or no) is determined by values
that have been set for the storage system.
See DP pool details to verify the protection settings of the DP pool. For DP volumes, see the volume information summary in volume details, and select the
Guard link to verify that the protect attribute is assigned.
If host I/O to DP volumes is suspended, resolve the issue, and then change thevolume access attribute to read/write (see related topics).>> HDT
OptionsTier management
Auto(HDT options are only displayed when it is this pool type.)
By selecting this option, the storage system automatically starts and stops performance monitoring and tier relocation based on the Cycle time and
Monitoring period settings.
Cycle time values range from 30 minutes to 24 hours. Monitoring period are user-configurable time periods (for example, 13:00 to 19:00 hours). Continuous
and Periodic monitoring modes apply to both the Cycle time and Monitoring
period settings (for details, see Continuous Monitoring mode).Tier management
ManualSelecting this option lets you manually start and stop performance monitoring and tier relocation.Tier management
CustomSelecting this option lets you create performance monitoring and tier relocation
plans using templates with different types of performance monitoring and tier
relocation settings. You can create and delete templates by name, set up monitoring periods (up to 7 days a week), set up relocation start times (up to 7
days a week), and view these plans in the Schedule Summary table. You can
modify templates to meet specific needs. In addition, click Pools using this
template to assign a template to any pool that you select from the Pools table.Monitoring mode
ContinuousContinuous monitoring mode uses weighted-average performance data gathered
over several monitoring cycles so that tier relocation does not respond
immediately to workload changes (see Cycle time). This mode prevents overreaction to workload changes, that might otherwise result in unnecessary
tier relocation I/O.Provisioning storage167Hitachi Command Suite User Guide 
						

							FieldSubfieldDescriptionMonitoring mode
PeriodicPeriodic monitoring mode uses performance data from the last monitoring cycle (see Cycle time). Tier relocation responds immediately to workload changes.
This mode is a more aggressive tier relocation monitoring mode.Relocation SpeedFor the VSP G1000, you can select one of five speeds for the relocation of pages in a pool, in a unit of time, from 1 (slowest) to 5 (fastest). The default is 3
(standard). To reduce the load on the storage system, specify a slower page
relocation speed. To give a higher priority to page relocations for the pool,
specify a faster relocation speed.Buffer Space for
New page
assignmentSets the buffer space used for new page assignments to HDT tiers (using the
default values is recommended).Buffer Space for
Tier relocationSets the buffer space used for tier page relocations between HDT tiers (using the default values is recommended).Note:  After configuring the pools, click Show Plan and perform all of the
confirming, scheduling, and submitting tasks needed to create the pools.
Related concepts
•
About virtualizing storage capacity  on page 160
Related tasks
•
Creating a DP pool  on page 162
•
Changing an access attribute to read/write  on page 174
Verifying DP pool information You can check the DP pools summary information to verify the current
number of pools, the virtual volume capacity, the pools usage, and the total and used pool capacity.
Prerequisites
• Create pools
• Discover (register) pools
Procedure 1. On the  Resources  tab, select  DP Pools under the target storage
system.
A list of DP pools, (DP pool volumes and DP volumes) provides summary
information that includes the number of pools, the virtual volume
capacity, pool usage, and the total and used pool capacity.
2. Select a DP pool to display more detailed information about that pool.
Use the detailed pools information to verify expected changes in capacity
or performance. Configuration information for each DP volume is displayed by clicking the volume link from the list in the  DP Vols tab.
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							If you configured HDT pool tiers to be managed automatically usingElement Manager, you can also verify the following:
• Monitoring Information
• Last Monitoring Start Date
• Last Monitoring End Date • Monitoring Status• Relocation Status• Relocation Progress (%)
Related concepts
•
About virtualizing storage capacity  on page 160
Related tasks •
Creating a DP pool  on page 162
Expanding DP pools Pool capacity can be increased by expanding DP pools or by converting HDP
pools into HDT pools.
Expand a DP pool by adding volumes to it. Expand an existing HDP pool by converting it into an HDT pool, which changes the pool type and allows you to
configure tiers that support a mix of drive types and RAID levels.
Prerequisites
• Register the storage system.
• Verify the external connections for any storage system with multiple performance levels before defining an external LDEV tier rank.
• Verify that when using Hitachi USP V/VM, Virtual Storage Platform, Virtual Storage Platform G1000, or HUS VM for DP pools:
○ Parity groups from which volumes have already been created can be
added
○ Drive type characteristics (for example: drive type and drive speed) in
parity groups and RAID level
• Verify the following when using HUS 100 or Hitachi AMS 2000 family of storage systems for DP pools:
○ Parity group capacity to add
○ Number of parity groups to add
○ There are drives in which a parity group has not been created
Note:  In HDT pools, if different drive types and/or RAID levels are mixed in a
single tier, they will all be considered equal for data placement regardless of page access frequency. As a result, I/O performance will be dependent on the
drive type characteristics and RAID level on which any given page resides.Provisioning storage169Hitachi Command Suite User Guide 
						

							Note: In HDP pools, if different drive types and/or RAID levels are mixed in
an HDP pool, I/O performance will be dependent on the drive type
characteristics and RAID level on which any given page resides.
Procedure
1. On the  Resources  tab, expand the storage systems, select an HDP pool
on the target storage system, and click  Expand Pool.
2. To expand an HDP pool:
a. In Additional Parity Groups, click  Add Parity Groups.
b. Select one of more parity groups, click  Add to Pool, and then click
Close . The Pool Summary is updated.
Tip: To change an existing HDP pool into an HDT pool, click  Changes to
an HDT pool .
3.To expand an HDT pool, in Additional Parity Groups, choose  Standard or
Mixed  mode.
For  Standard  mode (single drive type/speed, chip type, RAID level, and
volume location in a single tier):
• Tier 1 is the default, click  Add Parity Groups, select the parity group,
click  Add to Pool , and click Close. Select an available parity group
that best meets your performance or capacity needs (Tier 1 for best performance, Tier 2 for next best performance, and Tier 3 forcapacity).
• (Optional) Click  + to add Tier 2 and Tier 3, configure the tiers based
on your performance or capacity needs from volume choices in the
Add New Tier  dialog box. The Tier Configuration table in Pool
Summary is updated.
Tip:  To delete an existing tier, click  X in the  Tier tab.
For Mixed  mode (mixed drive types/speeds, chip types, RAID levels,
and/or volume locations in a single tier):
• Click  Add Parity Groups .
Note: There are two parity group tab choices from which you can
select:  Internal Parity Groups  and External Parity Groups  (the
Internal Parity Groups  tab is set by default). If you select the
External Parity Groups  tab and select one or more parity groups,
this enables the  External LDEV Tier Rank  menu from which you
must choose a ranking for the tier.
• For mixed mode in the  Internal Parity Groups tab or the External
Parity Groups  tab, select parity groups that you want to add to the
170Provisioning storageHitachi Command Suite User Guide