Thin Image cache management device requirements
The following table shows the cache management device requirements for
performing Thin Image tasks.
For information about DP tasks, see the
Provisioning Guide
for your storage
system.
Task
Number of cache management devices
required
Initially create an HTI pool.
•
VSP G200: 3,840
•
VSP G400, G600 and VSP F400, F600:
7,936
•
VSP G800 and VSP F800: 32,512
•
VSP G1000, G1500, and VSP F1500:
8,192*
*HTI assigns 4,096 of the 8,192 devices that
are available.
Create a volume.
1
Create a P-VOL.
256
Initially create an HTI pair for a volume.
(VSP G1000, G1500, and VSP F1500)
4,097
(VSP G1000, G1500, and VSP F1500) You can manage up to 65,280 cache
management devices in a storage system.
Calculating and assigning pool capacity
Use these formulas to calculate and assign pool capacity.
Use the following formula to calculate the capacity of the snapshot data that
you can store in the Thin Image pool:
Capacity of the snapshot data that you can store in the pool =
Total capacity of pool-VOLs in the pool - Capacity of V-VOL
management areas
The capacity of V-VOL management areas is 3% of the pool capacity.
Use the following formula to calculate the capacity of the snapshot data that
you can store in the DP pool:
Capacity of the snapshot data that you can store in the pool =
Total capacity of pool-VOLs in the pool - (Capacity of pool VOLs
used by DP-VOLs +
Capacity of V-VOL management areas)
80
Thin Image system and planning requirements
Hitachi Thin Image User Guide for Hitachi Virtual Storage Platform G Series and F Series
