Table of Contents
Cache limitations on data and data pool volumes
This section provides comparisons in capacity between the data volumes
and the data pool volumes under the limitations of the AMS controllers'
cache memory. The values in the tables and graph in this section are
calculated from the formulas and maximum supported capacity in
SnapShot capacity on page
•
NOTE: "Data volumes" in this section consist of TCE P-VOLs and S-VOLs
and SnapShot P-VOLs (if used).
•
Table 4-20: P-VOL to Data Pool Capacity Ratio on
AMS 2100 when Cache Memory is 2 GB/Controller
Ratio of All P-VOL Capacity
•
AMS 2300/2100 when Cache Memory is 4 GB per CTL
Ratio of All P-VOL Capacity
to All Data Pool Capacity
AMS 2100/2300/2500
Table 4-22: P-VOL to Data Pool Capacity Ratio on
AMS 2500/2300 when Cache Memory is 8 GB per CTL
Ratio of All P-VOL Capacity
Plan and design—arrays, volumes and operating systems
Hitachi AMS 2000 Family TrueCopy Extended Distance User Guide
to All Data Pool Capacity
1:0.1
1:0.3
1:0.5
Table 4-21: P-VOL to Data Pool Capacity Ratio on
1:0.5
1:1
1:3
to All Data Pool Capacity
1:0.1
1:0.3
1:0.5
4-24.
All P-VOL Capacity
to All Data Pool Capacity
All P-VOL Capacity
to All Data Pool Capacity (TB)
AMS 2100/2300
All P-VOL Capacity
to All Data Pool Capacity
40.0 : 4.0
24.0 : 7.2
17.1 : 8.5
TCE and
(TB)
4.6 : 0.4
2.8 : 0.8
2.0 : 1.0
20.6 : 2.0
12.4 : 3.7
8.8 : 4.4
(TB)
4–31
Table of Contents
Troubleshooting
