6.15.7 Create Tier Pool

The procedure to create a Tier pool is as follows:

On the global navigation tab, click Storage.
The registered ETERNUS Disk storage systems are displayed on the Main pane.
On the Main pane, click the target ETERNUS Disk storage system.
On the Category pane, click Automated Storage Tiering.
The items of the Category pane change into the items concerning Automated Storage Tiering.
On the Category pane, click Tier Pool.
The registered Tier pools are displayed on the Main pane.
On the Action pane, click Create under Tier Pool.
The information input screen is displayed.

Refer to the following table to enter the necessary information, and then click Next.

Item Name	Explanation
Tier Pool Name	This is a name of the Tier pool to be created. This name must be unique across all the ETERNUS Disk storage system registered in Storage Cruiser. Any alphanumeric character (1-16 characters), a hyphen (-), an underscore (_), and a pound symbol (#) may be specified. The letters to be specified are not case sensitive.
Policy Name	Specify the Tiering policy to associate with the Tier pool that is being created. Make a selection from the Tiering policies that have been defined and are displayed in the pull-down list.
Warning Threshold of Pool	To monitor the available capacity of the Tier pool, specify a threshold (%) of the usage rate of the Tier pool as a decimal figure in the range of 5-99. The default setting is "90". Specify a value that is greater than Caution Threshold of Pool. When this threshold is exceeded, a warning will be notified by the SNMP Trap.
Caution Threshold of Pool	To monitor the available capacity of the Tier pool, specify a threshold (%) of the usage rate of the Tier pool as 0 or as a decimal figure in the range of 5-80. The default setting is "75". Specify a value that is less than Warning Threshold of Pool. When this threshold is exceeded, a caution will be notified by the SNMP Trap. When "0" is specified or the Set no Caution Threshold of pool checkbox is checked on, the value of this item will be disabled.
Encryption Status	Specify whether to make the Tier pool being created an encrypted Tier pool. The default setting is "No" (do not encrypt). When setting this as an encrypted Tier pool, select "Yes".
Specify Assigned CM	As needed, specify the CM which takes charge of the Tier pool being created. In the default setting, a checkbox is not checked (a CM in charge is not specified). To specify a CM which takes charge of the Tier pool, check the checkbox. All of the CMs present on the storage device will be displayed, make a selection from these.
Number of Layers	Specify the number of layers of the Tier pool that is being created. 2 or 3 may be selected. The default setting is "2".
Disk Selection	Specify the method for the selection of disks that configure the sub-pool. The default setting is "Auto" (automatic selection). When "Auto" is selected, in the screen to configure the Low sub-pool, Middle sub-pool, and High sub-pool, it is necessary to specify a minimum required capacity for each of the sub-pools. When "Manual" is selected, in the screen to configure the Low sub-pool, Middle sub-pool, and High sub-pool, it is necessary to specify the disks that will configure each of the sub-pools.

The screen to configure the Low sub-pool is displayed.
Refer to the following table to enter the necessary information, and then click Next.

If "Auto" is selected for Disk Selection in step 6:

Item Name	Explanation
FTSP Name	Specify a name (that is unique within the ETERNUS SF system) for the sub-pool. Any alphanumeric character (1-16 characters), a hyphen (-), an underscore (_), and a pound symbol (#) may be specified. The letters to be specified are not case sensitive.
Disk Type	Specify the type of disk that will configure the sub-pool. Make a selection from the disk types (Online, Nearline, SSD, SED-SAS) that are displayed in the pull-down list.
Reliability	Specify the RAID level of the sub-pool. Make a selection from one of the following that are displayed in the pull-down list. High Performance(RAID1+0) High Capacity(RAID5) High Reliability(RAID6) Mirroring(RAID1) Striping(RAID0)
Minimum Required Capacity	Specify the capacity required at a minimum for the sub-pool. A capacity of 1MB or more may be specified. It is also possible to input a decimal value.
Specify Assigned CM	Only when a CM in charge has been specified in step 6, as needed, specify the CM which takes charge of the RAID group configuring the sub-pool. In the default setting, a checkbox is not checked (a CM in charge is not specified). Any CM in charge can be configured from the CM in charge specified to the Tier pool. To specify a CM in charge, check the checkbox. All of the CMs specified in step 6 will be displayed, make a selection from these. Up to 2 CMs may be specified.

If "Manual" is selected for Disk Selection in step 6:

Item Name	Explanation
FTSP Name	Specify a name (that is unique within the ETERNUS SF system) for the sub-pool. Any alphanumeric character (1-16 characters), a hyphen (-), an underscore (_), and a pound symbol (#) may be specified. The letters to be specified are not case sensitive.
Disk Type	Specify the type of disk that will configure the sub-pool. Make a selection from the disk types (Online, Nearline, SSD, SED-SAS) that are displayed in the pull-down list.
Reliability	Specify the RAID level of the sub-pool. Make a selection from one of the following that are displayed in the pull-down list. High Performance(RAID1+0) High Capacity(RAID5) High Reliability(RAID6) Mirroring(RAID1) Striping(RAID0)
Selection Disks	Specify the disk of the RAID group that will configure the sub-pool. The number of disks required will differ depending on the reliability of the RAID group.
Stripe Depth	Specify the size (KB) per disk in 1 stripe of the RAID group configuring the sub-pool. The default setting is "64". The stripe depth that can be specified depends on Reliability and the number of disks of the RAID group. High Performance(RAID1+0): 64/128/256/512/1024 High Capacity(RAID5) (from 2D+1P to 4D+1P): 64/128/256/512 High Capacity(RAID5) (from 5D+1P to 8D+1P): 64/128/256 High Capacity(RAID5) (from 9D+1P to 15D+1P): 64/128 High Reliability(RAID6): 64 Mirroring(RAID1): Cannot be specified Striping(RAID0): 64/128/256/512/1024
Specify Assigned CM	Only when a CM in charge has been specified in step 6, as needed, specify the CM which takes charge of the RAID group configuring the sub-pool. In the default setting, a checkbox is not checked (a CM in charge is not specified). Any CM in charge can be configured from the CM in charge specified to the Tier pool. To specify a CM in charge, check the checkbox. All of the CMs specified in step 6 will be displayed, make a selection from these. Only one CM can be specified.

The screen to configure the Middle sub-pool is displayed.
If "2" is selected for Number of Layers in step 6, the Middle sub-pool cannot be created. Click Next to go to next step.
If "3" is selected for Number of Layers in step 6, refer to the table of step 7 to enter the necessary information, and then click Next.
The screen to configure the High sub-pool is displayed.
Refer to the table of step 7 to enter the necessary information, and then click Next.
The information confirmation screen is displayed. Confirm the information, and then click Create.

Note

Even if "SED-SAS" is selected in Disk Type, the Encryption Status does not automatically switch to "Yes". When switching Tier pool to encrypted Tier pool, it is required to set the Encryption Status to "Yes", regardless of Disk Type. FTV for which Encryption is displayed as "Yes" on the Volume Overview screen is only the FTV created in the encrypted Tier pool.