Dell PS4100 Technical Information download pdf (Page 82)

June 2012 Dell EqualLogic Configuration Guide v13.2 76

5.3.2 FS7500 System Components

The system components in the initial release of the EqualLogic FS Series NAS appliance

(the FS7500)

consist of two controller node units and one backup power supply (BPS) shelf containing two

redundant power supplies. The system components and required power cabling paths are shown in

Figure 28.

Figure 28 FS7500 System Components and Power Cabling

5.3.2.1 System Controllers

The system contains dual active-active controller nodes with large onboard battery-backed caches

and 24 GB of battery protected memory per node. They operate in an active-active environment

mirroring the system’s cache. Each node regularly monitors the BPS battery status. They require the

BPS to maintain a minimum level of power stored during normal operation to ensure that they can

execute a proper shutdown procedure in the event of power interruption.

5.3.2.2 Backup Power Supply

The BPS is designed to provide power necessary for controllers to execute a proper shutdown

procedure. The BPS also enables the FS7500 controllers to use their onboard cache as NVRAM. This

provides the clustered solution with enough time to write all the data from the cache to disk in the

event a controller node experiences a loss of power.

5.3.3 FS7500 file system operation on controller failover

In the FS7500 system, writes to one controller node cache are mirrored to the other controller node

cache before the write is acknowledged and committed. This prevents loss of any in-flight write I/O if

a controller failure occurs. If a controller node failure occurs the cluster is put in journal mode. This

For detailed information on racking and power supply cabling see the

FS7500 Installation and Setup Guide

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Dell PS4100 Technical Information Page 82