Shared memory requirements

Additional shared memory is required when Dynamic Provisioning is used and the total capacity of Dynamic Provisioning, Dynamic Tiering, capacity saving (deduplication and compression), and Thin Image pools is 1.1 PB or more.

If the capacity saving function (deduplication and compression) is used, additional shared memory is required. If Dynamic Tiering or active flash is used, additional shared memory is required.

Caution Before shared memory is removed, all Dynamic Provisioning and Dynamic Tiering pools must be deleted.

The following table shows the required shared memory capacity when Dynamic Provisioning is used.

Total capacity of all pools

Required shared memory capacity

1.1 PB or less

None

If the total capacity satisfies both of following:

  • More than 1.1 PB
  • 3.4 PB or less

8 GB

If the total capacity satisfies both of following:

  • More than 3.4 PB
  • 7.9 PB or less

24 GB

If the total capacity satisfies both of following:

  • More than 7.9 PB
  • 12.3 PB or less

40 GB

TipThe V-VOL management area is automatically created when shared memory is added. This area is used to store information for associating pool-VOLs and DP-VOLs.

If Dynamic Tiering is used in conjunction with Dynamic Provisioning, Dynamic Tiering, and Thin Image pools, additional shared memory must be installed. When using Dynamic Tiering, the following table shows the required shared memory capacity.

Total capacity of all pools

Required shared memory capacity

1.1 PB or less

8 GB

If the total capacity satisfies both of following:

  • More than 1.1 PB
  • 3.4 PB or less

16 GB

If the total capacity satisfies both of following:

  • More than 3.4 PB
  • 7.9 PB or less

32 GB

If the total capacity satisfies both of following:

  • More than 7.9 PB
  • 12.3 PB or less

48 GB