Flexible host I/O module installation
Host I/O modules can be installed in slots 1A-1D and 2A-2D. Or, slots 1A-1F
and 2A-2F for diskless system. The configuration must be symmetric. For
example, if slot 1A is populated than slot 2A must also be populated. The
order of host I/O module installation is shown in the following table.
Table 1-3 Host I/O module Installation
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)
Drive trays
The HUS VM supports five different drive tray as described below. All
components in the drive trays are configured in redundant pairs to prevent
system failure. All components in the drive trays can be added or replaced
while the storage system is in operation.
• DBS - a 2U high tray containing up to 24 vertically mounted 2-1/2-inch
(SFF) HDD or SSD data drives. The DBS drive tray includes two
redundant power supplies and two ENC adapter boards that are used to
connect the tray to the controller. These connections may be direct via
SAS cable or in a daisy-chain fashion through the ENC adapters in other
drive trays. See
Figure 1-7 DBL drive tray front view on page 1-8.
• DBL - a 2U high tray containing up to 12 horizontally mounted 3-1/2-inch
(SSF) drives. The DBL drive tray includes two redundant power supplies
and two ENC adapter boards that are used to connect the tray to the
controller. These connections may be direct via SAS cable or in a daisy-
chain fashion through the ENC adapters in other drive trays, See
Figure
1-7 DBL drive tray front view on page 1-8.
• DBF - a 2U high tray containing up to 12 horizontally mounted 5-1/4-inch
Hitachi flash module drives (FMD). In addition to the drives, the tray
contains two redundant power supplies and two ENC adapter boards that
are used to connect the tray 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 trays, and connecting ENC
cables. See
Figure 1-10 DBF drive tray on page 1-10.
• DBX - a “high-density” 4U high tray containing up to 48 vertically
mounted 3-1/2-inch (LFF) drives. This drive tray is functionally divided
into two separate drive units (A and B), each containing a maximum of 24
Introduction
1-7
Hitachi Unified Storage VM Block Module Hardware User Guide
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