Hitachi AMS 2000 User Manual page 81

2. Calculate managed P-VOL and S-VOL capacity, using the formula:
ROUNDUP (P-VOL/S-VOL / 15.75) * 15.75
For example:
TCE P-VOL1: ROUNDUP (100 / 15.75) = 7
7 * 15.75 = 110.25 GB, the managed P-VOL Capacity
TCE S-VOL1: ROUNDUP (100 / 15.75) = 7
7 * 15.75 = 110.25 GB, the managed S-VOL Capacity
SnapShot P-VOL1: ROUNDUP (50 / 15.75) = 4
4 * 15.75 = 63 GB, the managed P-VOL Capacity
3. Add the total managed capacity of P-VOLs and S-VOLs. For example:
Total TCE P-VOL and S-VOL managed capacity = 221 GB
Total SnapShot P-VOL capacity = 63 GB
221 GB + 63 GB = 284 GB
4. For each P-VOL and S-VOL, list the data pools and their sizes. For
example:
TCE P-VOL1 has 1 data pool whose capacity = 70 GB
TCE S-VOL1 has 1 data pool whose capacity = 70 GB
SnapShot P-VOL1 has 1 data pool whose capacity = 30 GB
5. Calculate managed data pool capacity, using the formula:
ROUNDUP (data pool capacity / 3.2) * 3.2
For example:
TCE P-VOL 1 data pool: ROUNDUP (70 / 3.2 = 22) * 3.2 = 71 GB
TCE S-VOL 1 data pool: ROUNDUP (70 / 3.2 = 22) * 3.2 = 71 GB
SS P-VOL 1 data pool: ROUNDUP (30 / 3.2 = 10) * 3.2 = 32 GB
6. Add total data pool managed capacity. For example:
71 GB + 71 GB + 32 GB = 175 GB
7. Calculate total managed capacity using the following equation:
ROUNDUP Total TCE/SnapShot managed capacity / 5 + total data
pool managed capacity < maximum supported capacity
For example:
Divide the total TCE/SnapShot capacity by 5.
284 GB / 5 = 57 GB
8. Add the quotient to data pool managed capacity. For example:
57 GB + 176 GB = 234 GB
9. Compare managed capacity to maximum supported capacity for the 4
GB cache per controller for AMS 2300, which is 6.2 TB. The managed
capacity is well below maximum supported capacity.
Table 4-20 on page 4-31
closely capacity between data volumes and data pool volumes must be
managed. These tables are provided for your information. Also,
on page 4-32 shows a graph of how data volume-to-data pool volume
relates to maximum supported capacity.
Plan and design—arrays, volumes and operating systems
Hitachi AMS 2000 Family TrueCopy Extended Distance User Guide
through Table 4-23 on page 4-32 show how
Figure 4-4
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