Calculating the number of cache management devices required for DP-VOLs

The number of cache management devices that a DP-VOL requires depends on the capacity of the V-VOL (capacity of the user area) and the maximum capacity of cache management device. The maximum capacity of cache management device depends on the pool attribute (internal volume or external volume) associated with V-VOL.

The following table explains the relationship between the pool attribute and the maximum capacity of cache management device.

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  • 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.