A one layer Tier pool is registered as a FTRP in a storage device.
Creating a Tier pool from the Web Console creates both FTRP and FTSP in the storage device. Moreover, it is also made possible to create an FTV in the storage device from the Web Console.
An Assigned CM can be specified when performing the following operations.
When creating a one layer Tier pool
When expanding the capacity of the sub-pool
The Assigned CM is specified as a pair formed by a CM number and a CPU number. It is possible to specify more than one Assigned CM, and by specifying an Assigned CM in relation to the Tier pool, it is possible to specify an Assigned CM of the entire Tier pool.
When multiple Assigned CMs are specified to the Tier pool, the Assigned CM is decided from the specified Assigned CMs using the round-robin method.
When creating a sub-pool in the Tier pool, it is possible to specify an Assigned CM of the sub-pool from the multiple Assigned CMs specified to the Tier pool.
When expanding the capacity of the sub-pool, take into account the Assigned CMs that have already been assigned to each sub-pool that has already been created, and assign an Assigned CM using the round-robin method. It is also possible to make a specification from the Assigned CM which is displayed in the Assigned CM list.
When a specification of an Assigned CM has been omitted, this will automatically be assigned according to the implementation of the storage device.
Specified Tier Pool | Sub-Pool Specification | Assigned CM to Be Set | Description |
|---|---|---|---|
CM#0 | - | CM#0 | Configure CM#0 according to specification of pool |
CM#0, CM#1 | - | CM#0 | Configure CM#0 in round-robin method based on specified Tier pool |
CM#0, CM#1 | CM#0 | CM#0 | Configure CM#0 according to specification of sub-pool |
CM#0, CM#1 | CM#1 | CM#1 | Configure CM#1 according to specification of sub-pool |
Specified Tier Pool | Set Assigned CM | Assigned CM Which Are Newly Assigned | Description |
|---|---|---|---|
CM#0 | CM#0 | CM#0 | Configure CM#0 according to specification of pool |
CM#0, CM#1 | CM#0 | CM#1 | Configure CM#1 that is not assigned |
CM#0, CM#1 | CM#1 | CM#0 | Configure CM#0 that is not assigned |
The disk can be automatically selected when performing the following operations.
When creating a one layer Tier pool
When expanding the capacity of the sub-pool
Specify the necessary physical capacity when selecting automatically. The disk can also be selected manually.
Create a one layer Tier pool. Refer to "Create One Layer Tier Pool" in the ETERNUS SF Web Console Guide for information on how to create it.
To change the operation of one layer Tier pool, change the definition of the Tier pool.
Changeable items are as shown in "Table 6.4 Change One Layer Tier Pool".
Item | Meaning |
|---|---|
Warning Threshold of Pool | This is the threshold (%) of the usage rate of the Tier pool in order to monitor the available capacity of the Tier pool. It is necessary to specify a value that is greater than Caution Threshold of Pool. |
Caution Threshold of Pool | This is the threshold (%) of the usage rate of the Tier pool in order to monitor the available capacity of the Tier pool. It is necessary to specify a value that is smaller than Warning Threshold of Pool. It is also possible to not configure this item. |
FTSP name | This is a name of the sub-pool. |
Refer to "Display Tier Pool" in the ETERNUS SF Web Console Guide for information on how to display the current detailed information of a Tier pool.
Refer to "Change Tier Pool" in the ETERNUS SF Web Console Guide for information on how to change the Tier pool.
Point
It is not possible to change the definition of multiple Tier pools at once. When changing the definition of multiple Tier pools, make changes to the each Tier pool at a time.
The definition of a Tier pool in which Automated Storage Tiering has already been started cannot be changed.
Before operating the deletion, display the detailed information of the one layer Tier pool that you are about to delete and confirm that deleting this will not be a problem. Refer to "Display Tier Pool" in the ETERNUS SF Web Console Guide for information on how to display the detailed information of a Tier pool.
Refer to "Delete Tier Pool" in the ETERNUS SF Web Console Guide for information on how to delete a Tier pool.
Point
Multiple Tier pools can be deleted at onece.
The following Tier pools cannot be deleted.
Tier pools on which FTVs are present
Tier pools in which Automated Storage Tiering has already been started
It is possible to expand the capacity of the sub-pools which configure a one layer Tier pool. Refer to "Expand Capacity of Sub Pool in Tier Pool" in the ETERNUS SF Web Console Guide for information on how to expand the capacity of a sub-pool.
Note
Expanding the capacity of the sub-pool leads to deviation of data in the sub-pool and brings about variations in access performance. Perform the Flexible Tier Pool Balancing using ETERNUS Web GUI or ETERNUS CLI in order to eliminate data deviation. Refer to the ETERNUS Web GUI Online Help for information on how to perform the Flexible Tier Pool Balancing.
Perform the Flexible Tier Pool Balancing after stopping Automated Storage Tiering in relation to the target Tier pool. When the Flexible Tier Pool Balancing is performed during the operation of Automated Storage Tiering, this may cause cases where Automated Storage Tiering does not operate properly. Refer to "Start/Stop Automated Storage Tiering for Tier Pool" in the ETERNUS SF Web Console Guide for information on how to stop Automated Storage Tiering of a Tier pool.
