User guide

Introduction 1–7
Hitachi Unified Storage VM Block Module Hardware User Guide
Table 1-3: Host I/O module Installation
Drive boxes
The HUS VM supports four different drive box as described below. All
components in the drive boxes are configured in redundant pairs to prevent
system failure. All components in the drive boxes can be added or replaced
while the storage system is in operation.
• DBS - a 2U high box containing up to 24 vertically mounted 2-1/2-inch
(SFF) HDD or SSD data drives. The DBS drive box includes two
redundant power supplies and two ENC adapter boards that are used to
connect the box to the controller. These connections may be direct via
SAS cable or in a daisy-chain fashion through the ENC adapters in other
drive boxes. See Figure 1-5: DBL (top photo) and DBS (bottom photo)
drive box front views on page 1-8.
• DBL - a 2U high box containing up to 12 horizontally mounted 3-1/2-
inch (SSF) drives. The DBL drive box includes two redundant power
supplies and two ENC adapter boards that are used to connect the box
to the controller. These connections may be direct via SAS cable or in a
daisy-chain fashion through the ENC adapters in other drive boxes, See
Figure 1-5: DBL (top photo) and DBS (bottom photo) drive box front
views on page 1-8.
• DBF - a 2U high box containing up to 12 horizontally mounted 5-1/4-
inch Hitachi flash module drives (FMD). In addition to the drives, the box
contains two redundant power supplies and two ENC adapter boards that
are used to connect the box to the controller. The connection to the
controller may be direct via ENC cable or via a daisy-chain connection
through the ENC adapters in other drive boxes, and connecting ENC
cables. See Figure 1-7: DBF drive box on page 1-10.
• DBX - a “high-density” 4U high box containing up to 48 vertically
mounted 3-1/2-inch (LFF) drives. This drive box is functionally divided
into two separate drive units (A and B), each containing a maximum of
24 drives. Each drive unit contains two redundant power supplies and
two ENC adapter boards that are used to connect the box to the
controller. the connection to the controller may be direct via ENC cable
or via a daisy-chain connection through the ENC adapters in other drive
boxes See Figure 1-9: DBX (dense) drive box front bezel and front panel
on page 1-12 and Figure 1-10: DBX (dense) drive box rear panel on
page 1-13.
Installation
Order
Installation Slot Location
Diskless Mode Disk-in Model
1 1A/2A (CHB-1A/2A) 1A/2A (CHB-1A/2A)
2 1B/2B (CHB-1B/2B) 1B/2B (CHB-1B/2B)
3 1C/2C (CHB-1C/2C) 1C/2C (CHB-1C/2C)
4 1D/2D (CHB-1D/2D) 1D/2D (CHB-1D/2D)
5 1E/2E (CHB-1E/2E)
6 1F/2F (CHB-1F/2F)