Table of Contents
Table 4-23: P-VOL to Data Pool Capacity Ratio on
AMS 2500 when Cache Memory is 16 GB per CTL
1:0.1
1:0.3
1:0.5
•
Figure 4-4: Relation of Data Volume, Data Pool Capacities to Cache Size
Cautions for Reconfiguring the Cache Memory
The cautions for the cache memory reconfiguration processing in the
installation, un-installation, or invalidation/validation operation occur when
the firmware version of array is 0897/A or more.
•
I/O processing performance
The I/O performance, in case of the sequential write pattern,
deteriorates approximately 20% to 30% by releasing a part of the user
data area in the cache memory and performing the memory
reconfiguration of the management information storage area for TCE. In
other patterns, the I/O performance deteriorates less than 10%.
•
Time-out for memory reconfiguration processing
4–32
Hitachi AMS 2000 Family TrueCopy Extended Distance User Guide
Ratio of All P-VOL Capacity
to All Data Pool Capacity
Plan and design—arrays, volumes and operating systems
All P-VOL Capacity
to All Data Pool Capacity
80.0 : 8.0
48.0 : 14.4
34.2 : 17.1
per Controller
(TB)
Table of Contents
Troubleshooting
