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LaCie 12big Rack Fibre 8 System Overview

User Manual page 14

1.4.2. LaCie 12big Rack Fibre 8 RAID

Controller Module

One or two RAID Controller modules are supplied as part of the

12big Rack Fibre 8 enclosure core product (Fig. 08).

The hot swappable plug-in 12big Rack Fibre 8 RAID Controller

modules have been designed for integration into this SBB-compliant

(Storage Bridge Bay) form factor enclosure. The controller provides

dual external ﬁbre channel (FC) cable interfacing for connectivity

to the host computer system, a SAS interface for connection to an

Expansion enclosure, an out-of-band Ethernet interface for Embed-

ded StorView and an out-of-band VT-100 interface for access to the

controller ﬁrmware program.

IMPORTANT INFO: Do not mix RAID Controller Modules and

Disk I/O Modules in the same enclosure.

The controller’s internal processor monitors conditions on each disk

drive port. It provides an enclosure management interface to devices

on the backplane, Power Cooling Modules, partner RAID Controller

module, and OPS panel. When the enclosure is supplied with dual

controllers, these processors operate in an active-active conﬁgura-

tion to allow for fail over and fail back.

The 12big Rack Fibre 8 RAID Controller provides support for Native

Command Queuing (NCQ). NCQ increases the performance of

SATA disk drives by allowing the individual disk to internally optimize

the order in which it executes read and write commands. This will re-

duce the amount of unnecessary movement of the drive’s heads re-

sulting in increased performance. The controllers also support a set

of performance tuning features like write-back cache management,

overload performance management, synchronized cache ﬂush, tar-

get command thread balancing and sequential write optimization.

Description and use of these performance features are found in the

StorView Storage Management Software User Guide and in the VT-

100 RAID Conﬁguration Utility User Guide.

The controller supports either 1 GB or 2 GB cache memory SD-RAM

modules.

SATA disk drives are supported and require an Active/Active MUX

transition card, see 1.4.5.3. MUX Transition Cards .

continued on the next page>>

Fig. 08 - 12big Rack Fibre 8 RAID Controller Module

TECHNICAL NOTE: The white diamond icon with an arrow point-

ing away from the connector indicates a SAS out port.

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