User guide

1–6 Introduction
Hitachi Unified Storage VM Block Module Hardware User Guide
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.
2 Main Blade
(cache
memory,
cache
flash
memory,
backup
battery)
2 4 The main blades contain the cache memory, cache
backup (destage) battery, and cache flash memory
(SSD). Cache memory is available in 64GB, 128GB
and 192GB capacities.
If the power fails, the cache is protected from data
loss by backup batteries and the cache flash memory,
an 80 GB SSD drive. The batteries keep the cache
alive for up to 10 minutes while the data is transferred
to the flash memory.
Each main blade contains two replaceable multispeed
cooling fans.
3MP Blade
(microproc
essor)
2 2 The MP blades are independent of the back-end I/O
modules and host I/O modules and can be shared
across them.
Each MP blade contains two replaceable multispeed
cooling fans.
4host I/O
module
28 with
drives
----------
12 for
diskless
system
A host I/O module is an interface board that provides
connection to host servers. Each host I/O module
contains an internal processor and 128 bytes of edit
buffer memory.
5 Blanking panel which protects the slots for host I/O modules and/or back-end I/O modules
6back-end
I/O
module
0 if
diskless
----------
2 with
drives
4 A back-end I/O module provides connection to the
HDD, SSD, and FMD data drives. It controls functions
for data transfer between data drives and cache. The
back-end I/O module contains DRR (Data Recover
and Reconstruct), a parity generator circuit. It
supports eight FIBRE path and offers 32 KB of buffer
for each FIBRE path.
7Power
supply
1 2 200-240 VAC input. Provides power to the controller
chassis in a redundant configuration. Each power
supply contains two cooling fans to ensure adequate
cooling in case one of the fans fails. The system can
operate with one power supply if the second one fails.
8Service
Processor
1 1 A custom PC that is used to monitor and control the
storage system. It contains the Storage Navigator
software that is used to configure nd monitor the
system. Connecting the SVP to a service center
enables the storage system to be remotely monitored
and maintained by the Hitachi Data Systems support
team, significantly increasing the level of support.
Item Item
Description
Name Min Max