A Tier pool is registered as an FTRP of the storage device.
When a Tier pool is created from the Web Console, an FTRP and FTSPs are both created in the storage device. Furthermore, from the Web Console, it becomes possible to create an FTV in the storage device.
Specifying Master CM
A Master CM can be specified when performing the following operations.
When creating a Tier pool
When changing a layer number of Tier pool
When expanding the capacity of the sub-pool
Point
For the changing a layer number of the Tier pool and the expanding capacity of the sub-pool, the Master CM can be added only when the Master CM has been specified at the time the Tier pool was made.
As there is an effect on performance of access to the sub-pool due to the Master CM, it is recommended that all sub-pools contained in the Tier pool are assigned to the same Master CM.
The Master CM is specified as a pair formed by a CM number and a CPU number (or only the CM number when using the ETERNUS DX100 S3/DX200 S3, DX500 S3/DX600 S3).
It is possible to specify more than one Master CM, and by specifying a Master CM in relation to the Tier pool, it is possible to specify a Master CM of the entire Tier pool.
When multiple Master CMs are specified to the Tier pool, the Master CM is decided from the specified Master CMs using the round-robin method.
When creating a sub-pool in the Tier pool, it is possible to specify a Master CM of the sub-pool from the multiple Master CMs specified to the Tier pool.
When expanding the capacity of the sub-pool, take into account the master CMs that have already been assigned to each sub-pool that has already been created, and assign a Master CM using the round-robin method. It is also possible to make a specification from the Master CM which is displayed in the Master CM list.
When a specification of a Master CM has been omitted, this will automatically be assigned according to the implementation of the storage device.
Specification | Sub-Pool Specification | Master CM to Be Set | Explanation | ||||
|---|---|---|---|---|---|---|---|
Low | Middle | High | Low | Middle | High | ||
CM#0 | - | - | - | CM#0 | CM#0 | CM#0 | Configure CM#0 according to specification of pool |
CM#0, CM#1 | - | - | - | CM#0 | CM#1 | CM#0 | With Low as CM#0, Middle and High are configured with the round-robin method |
CM#0, CM#1 | CM#1 | - | - | CM#1 | CM#0 | CM#1 | Explicitly specify CM#1 for Low while Middle and High are configured with the round-robin method |
CM#0, CM#1 | - | CM#1 | - | CM#0 | CM#1 | CM#0 | With Low as CM#0, explicitly specify CM#1 for Middle while High is configured with the round-robin method |
CM#0, CM#1 | - | - | CM#1 | CM#0 | CM#1 | CM#1 | With Low as CM#0, Middle is configured with the round-robin method while explicitly specifying CM#1 for High |
Specification | Set Master CM | Sub-Pools | Master CM Which Are Assigned | Explanation | ||
|---|---|---|---|---|---|---|
Low | Middle | High | ||||
CM#0, CM#1 | CM#0 | CM#1 | CM#0 | Low | CM#1 | As 2 cases with CM#0 and 1 case with CM#1 have already been configured, configure CM#1 |
CM#0, CM#1 | CM#1 | CM#0 | CM#1 | Middle | CM#0 | As 1 case with CM#0 and 1 case with CM#0 have already been configured, configure CM#0 |
CM#0, CM#1 | CM#0 | CM#1 | CM#0 | High | CM#1 | As 2 cases with CM#0 and 1 case with CM#1 have already been configured, configure CM#1 |
CM#0, CM#1 | CM#0 | CM#1 | CM#1 | Low#1, Low#2 | CM#0 (Low#1), CM#0 (Low#2) | As 1 cases with CM#0 and 2 cases with CM#1 have already been configured, configure CM#0 |
Even when the configuration is of that other than 2CMs, the allocation can be performed similarly using the round-robin method.
Disk Auto-Selection
The disk can be automatically selected when performing the following operations.
When creating a Tier pool
When changing a layer number of 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, as before.
