Cache management devices are the unit for controlling the cache in association with logical volumes (LDEVs). They are required to perform HTI tasks, such as creating HTI pairs for a volume.
To view the number of cache management devices in HDvM - SN, see Viewing the number of cache management devices.
Use the following formula to calculate the number of HTI pairs that you can create based on the number of cache management devices:
Number of HTI pairs that you can create = Number of cache management devices / ceil (the P-VOL capacity of HTI pairs [TB]) / 2.6)