User guide

Introduction 1–13
Hitachi Unified Storage VM Block Module Hardware User Guide
Cache memory
The HUS VM can be configured with up to 256 GB of cache memory. Each
HUS VM system contains two Main blades as shown in the following
illustration. Each Main blade contains a single main board with 32, 64, 96,
or 128 GB of cache memory. Main blades are installed in pairs and work
together to provide cache and shared memory for the system.
Figure 1-10: DBX (dense) drive box rear panel
Item Description Item Description
1 Power Supply B1 2 Power Supply B0
3 Power Supply A1 4 Power Supply A0
5 ENC Unit B1 IN 6 ENC Unit B1 OUT
7 ENC Unit B0 IN 8 ENC Unit B0 OUT
9 ENC Unit A1 IN 10 ENC Unit A1 OUT
11 ENC Unit A0 IN 12 ENC Unit A0 OUT
Figure 1-11: Cache memory
Item Description Item Description
1 Main blade / cache cluster 1 2 Main blade / cache cluster 2