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
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 any FTV is present
Tier pools that have Virtual Volumes
Tier pools in which Automated Storage Tiering has already been started
Tier pools that have configured VVOL datastores
Tier pools that have configured Clone backup VVOL datastores
It is possible to expand the capacity of the sub-pools which configure a one layer Tier pool. Refer to "Expand Capacity of SubPool 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 differences in access performance may occur. Execute Tier pool balancing in order to resolve data deviation. Also execute the Tier pool balancing when expanding the capacity of the sub-pool. Refer to "Expand Capacity of Sub-Pool in Tier Pool" in the ETERNUS SF Web Console Guide for the setting method.
Tier pool balancing can be started after expanding the capacity of the sub-pool. Refer to "Start/Stop Tier Pool Balancing" in the ETERNUS SF Web Console Guide for the method of starting.
See
Refer to "6.5.1.5 Balancing of One Layer Tier Pool" for details of one Tier pool balancing.
Tier pool balancing is a function that relocates the physically allocated areas for RAID groups within each sub-pool that makes up a Tier pool so that the usage capacity of each RAID Group becomes even balanced. Therefore, I/O access to the FTV is almost evenly distributed to RAID groups within the FTSP.
Perform a Tier pool balancing when you want to equalize the volumes used by the RAID groups within the FTSP.
Tier pool balancing can be performed regardless of the balancing level. Normally, Tier pool balancing is performed to change the Tier pool balancing level from "Middle" or "Low" to "High".
The balancing level can be confirmed from Balancing:Level that is displayed in the Tier pool overview on the Automated Storage Tiering of the Web Console.
The Tier pool balancing processing can be stopped. The Tier pool balancing can be started/stopped for only one Tier pool within the device.
See
Refer to "Start/Stop Tier Pool Balancing" in the ETERNUS SF Web Console Guide for information on how to start/stop Tier pool balancing.
To perform a Tier pool balancing, the target one layer Tier pool must satisfy all of the following requirements:
Pool Status of the target Tier pool is "Available", "Partially Readying", or "Exposed".
The Tier pool balancing process for the target Tier pool is not running.
Balancing:Status of the target Tier pool is "Stop".
To stop the Tier pool balancing process, target one layer Tier pool must satisfy the following requirement:
Balancing:Status of the target Tier pool is "Active" or "Error".
Point
Even when the business I/Os are occurring on the one layer Tier pool, a Tier pool balancing can be performed on the one layer Tier pool.
The one layer Tier pool balancing level, sub-pool balancing level and balancing progress status can be confirmed with the Web Console. Refer to "Confirmation of Configuration Details of Tier Pool" in the ETERNUS SF Storage Cruiser Operation Guide for Optimization Function for details.
Note
Tier pool balancing prioritizes FTVs with a low balancing level within the Tier pool and a maximum of 32 FTVs can be balanced at a time. For this reason, if there are many FTVs, there may be times when the balancing level does not become "High" even if a Tier pool balancing is performed. To make the balancing level "High", reperform a Tier pool balancing.
If the balancing status is "Error", stop the Tier pool balancing process for that one layer Tier pool.
Even if a Tier pool balancing is performed, the sub-pool that was physically allocated with the FTV is not changed.
Tier pool balancing cannot be performed if any of the following conditions are satisfied:
Operating Status of the target Tier pool is "Start".
An FTV does not exist in the target Tier pool.
A Tier pool that is performing a Tier pool balancing exists within the storage device.
The maximum number of volumes is registered on storage device.
The number of sessions for a Thin Provisioning Volume balancing and RAID Migration is a combined 32 processes executing at the same time in the storage device.
The migration capacity for a Thin Provisioning Volume balancing and RAID Migration is a combined 128TB process executing at the same time in the storage device.
A RAID group diagnosis is being executed on the storage device.
A disk diagnosis is being executed on the storage device.
The capacity is being optimized for all FTVs to be balanced that exist on the target Tier pool.
ODX is being executed for all FTVs to be balanced that exist on the target Tier pool.
The Tier pool balancing process cannot be stopped for the following cases:
The Tier pool performing the Tier pool balancing does not exist.
The Tier pool stopping the Tier pool balancing due to an error does not exist.
The Tier pool balancing process for the target Tier pool is completed.
When creating, deleting, or configuring the FTV, the balancing level is not updated. Execute a status update of Automated Storage Tiering to update the balancing level.
FTVs that satisfy any of the following conditions are not targets for the balancing process.
FTVs with a total capacity of 20GB or less
FTVs with a used capacity of 10GB or less
