Maximum capacity of cache management devices

Pool attribute

Maximum capacity (MB)

Maximum capacity (blocks)

Internal volume

3,145,548

(2.99 TB)

6,442,082,304

External volume

3,145,548

(2.99 TB)

6,442,082,304

Use the following formula to calculate the number of cache management devices that a DP-VOL requires. In this formula, the user-specified capacity is the user area capacity of a V-VOL.

ceil(user-specified-capacity รท max-capacity-of-cache-management-device)

where

  • ceil: The value enclosed in ceil( ) must be rounded up to the nearest whole number.

Note
  • For a DP-VOL with the deduplication or compression function enabled, use twice the number of the cache management devices calculated by this formula.
  • For each deduplication system data volume, 14 cache management devices are used.
Parent Topic
  • Cache management device requirements

    Cache management devices are used to manage the cache associated with volumes (LDEVs). Each volume (LDEV) requires at least one cache management device. An LDEV that is not a DP-VOL requires one cache management device. For an LDEV that is a DP-VOL, you need to calculate the number of cache management devices required.