Tce And Snapshot Capacity - Hitachi AMS 2000 User Manual

TCE and SnapShot capacity

Because capacity is managed by the array in blocks of 15.75 KB for of data
volumes and 3.2 KB for data pools, the capacity of your array's TCE and
SnapShot volumes must be specially calculated.
All formulas, tables, graphs and examples pertain to one controller. On dual
controller arrays, you must perform calculations for both controllers.
Managed capacity is calculated here, per controller, using the following
formula:
Size of all TCE P-VOLs +
Size of all TCE S-VOLs +
Size all SnapShot P-VOLs (if used)
/ 5
+ size of all data pool volumes
< Max. Sup. Capacity
Maximum supported capacity is shown in
•
Table 4-15: Maximum Supported Capacities, per
Cache Memory
per Controller
2 GB per CTL
4 GB per CTL
8 GB per CTL
16 GB per CTL
•
NOTE: In a dual-controller array, the calculations must be performed for
both controllers.
Example:
In this example, the array and cache memory per controller is
AMS 2300/4 GB.
1. List the size of each TCE P-VOL and S-VOL on the array, and of each
SnapShot P-VOL (if present) in the array. For example:
TCE P-VOL 1 = 100 GB
TCE S-VOL 1 = 100 GB
SnapShot P-VOL 1 = 50 GB
4–24
Hitachi AMS 2000 Family TrueCopy Extended Distance User Guide
Controller Cache Size
(TCE P-VOLs and S-VOLs, SnapShot P-VOLs, Data
AMS2100
1.4 TB
6.2 TB
Not supported
Not supported
Plan and design—arrays, volumes and operating systems
Table 4-15.
Maximum Capacity
Pools)
AMS2300
Not supported Not supported
6.2 TB Not supported
12.0 TB 12.0 TB
Not supported 24.0 TB
AMS2500