User guide

Introduction 1–15
Hitachi Unified Storage VM Block Module Hardware User Guide
Shared memory
Shared Memory, which holds storage system configuration information,
resides in cache. Shared Memory Capacity plus Cache Memory Capacity
equals Total Cache Memory Capacity necessary for the storage system.
The following table shows the shared memory capacity needed depending
on by the kind of software applications are installed in the system.
Table 1-5: Shared Memory Capacity
Judgment Factor of SM Capacity
3
Program Product
1, 2
SI/VM/DP Extension
TC/UR
Extension
SM
Capacity
SI/VM2/
DP
TC/UR DT 1 2
{ XXXXX
8 GB
{{ X { XX
16 GB
{ X { XXX
16 GB
{{{{ XX
24 GB
{{ X {{ X
24 GB
{ { X { X {
24 GB
{{{{{{
32 GB
{{{{{ X
32 GB
{{{{ X {
32 GB
{{{{{{
40 GB
Notes:
1. DP = Dynamic Provisioning, DT = Dynamic Tiering, SI = ShadowImage, TC = True
Copy, UR = Universal Replicator, VM = Volume Migration
2. Volume Migration is a function in Hitachi Tiered Storage Manager
3. Symbol key
X (N) Functions and Program Products described in the table are not
available as the SM used by the functions and the Program
Product is ineffective.
? (Y) Functions and Program Products described in the table are
available when the SM used by the functions and Program
Products is effective. To use the Program Products, performing
installation operation separately is required (see note 4)
Example The SM capacity when TC is applied is 16 GB or more.
The SM becomes effective regardless of functional necessity of
SI/VM/DP,SI/VM/DP Extension1 and UR, and they can be
available to use by installation.
Functions marked with X(No) cannot be used)
4. For installation, see the Hitachi Storage Navigator User Guide.