Pool capacity

Calculate pool capacity using the following formula:

The capacity of the pool (MB) = Total number of pages * 42 - 4200.

4200 in the formula is the management area size of the pool-VOL with System Area.

Total Number of pages = Σ(floor(floor(pool-VOL number of blocks ÷ 512) ÷ 168)) for each pool-VOL.

floor( ): Truncates the value calculated from the formula in parentheses after the decimal point.

• VSP G800 and VSP F800: the total capacity of all pools is 6.5 PB if control memory is installed.

• VSP G400, G600 or VSP F400, F600: the total capacity of all pools is 6.5 PB if control memory is installed.

• VSP G200: the total capacity of all pools is 3.5 PB if control memory is installed.

Maximum number of pool-VOLs

From 1 to 1,024 volumes (per pool).

A volume can be registered as a pool-VOL to one pool only.

Maximum number of pools

• VSP G800 or VSP F800: Up to a total of 128 pools per storage system. Pool numbers (0 to 127) are assigned as pool identifiers.

• VSP G400, G600 or VSP F400, F600: Up to a total of 64 pools per storage system. Pool numbers (0 to 63) are assigned as pool identifiers.

• VSP G200 : Up to a total of 64 pools per storage system. Pool numbers (0 to 63) are assigned as pool identifiers.

The maximum number of pools includes following pool types:

• Dynamic Provisioning (including Dynamic Tiering and active flash)

• Thin Image

Increasing capacity

You can increase pool capacity dynamically. We recommend adding pool-VOLs to increase capacity by one or more parity groups.

Reducing capacity

You can reduce pool capacity by removing pool-VOLs.

Deleting

You can delete pools that are not associated with any DP-VOLs.

Subscription limit

From 0 to 65534 (%).

If you do not specify a value, the subscription is set to unlimited.

Thresholds

• Warning threshold: You can set the value between 1% and 100%, in 1% increments. The default is 70%.

• Depletion threshold: You can set the value between the warning threshold and 100%, in 1% increments. The default is 80%.

• Thresholds cannot be defined as the pool of the data direct mapping attribute.

Data allocation unit

42 MB

The 42-MB page corresponds to a 42-MB continuous area of the DP-VOL. Pages are allocated for the pool only when data has been written to the area of the DP-VOL.

Tier

(Dynamic Tiering and active flash)

Defined based on the media type (see Drive type for Dynamic Tiering and active flash tier, below). Maximum three tiers.

Maximum capacity of each tier

(Dynamic Tiering and active flash)

• VSP G800 or VSP F800: 4.0 PB (Total capacity of the tiers must be within 4.0 PB and the control memory must be installed)

• VSP G400, G600 or VSP F400, F600: 4.0 PB (Total capacity of the tiers must be within 4.0 PB and the control memory must be installed)

• VSP G200: 3.5 PB (Total capacity of the tiers must be within 3.5 PB and the control memory must be installed)