Total Capacity = Sum of capacities of Data Devices (enabled or disabled) in the pool (which is the total physical capacity of the pool) - Yes (some customers would have a dedicated disk group for thick boot luns but generally not considered in capacity planning) Free Capacity = Out of all the "enabled" Data Devices, how much is free? or our of ALL the Data Devices (enabled and disabled), how much is free - Free capacity should be the total free capacity on enabled & disabled data devs. % Subscription = Couldn't figure it out - Are you talking about the max subscription %? In general, subscription % of the tdev means how much you have used from the bound pool? Enabled Capacity = We can enable or disable data devices in a Thin Pool. So the Enabled Capacity is the sum of ALL enabled data devices. - Yes Allocated Capacity = Out of the "Enabled Capacity", how much are bound to Thin Devices - It is the amount of space you have allocated for tdev in a pool using the allocate command. If allocated to 100%, it means you have blocked the space in pool equal to your tdev size. % Allocated = (Allocated Capacity / Enabled Capacity) x 100 - please confirm? I guess  Apart from usable capacity and allocated capacity, you should look at the actual written capacity also. total written should not be getting close to usuable capacity and to avoid oversubscription, you can set the max oversubscription to 100%.
Hi,  I'm having a bit of trouble understanding certain things on Unisphere.  I have a VMAX 20K where LUNs are configured as Thin.  Now i want to figure out how much actual capacity im consuming from my VMAX. I have 3 tiers (SSD, FC, SATA) configued with FAST VP.  I think if i can figure out the exact meanings of the below properties, i can have a clear idea:  - Total Capacity - Free Capacity - % Allocated - Maximum Subscription - % Subscription - Enabled Capacity - Allocated Capacity  As you can see, these are ALOT of capacity parameters to grasp,but what i am interested in is:  - Total Physical Usable Capacity - Total Physical Free Capacity - Total THIN Free Capacity - Total Physical Used Capacity - Total ALLOCATED capacity (presented to hosts.. what the hosts can see)  I hope im making sense here. Appreciate all the help!  JS
Unisphere on VMAX - Capacities