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Transition Guide for PowerVault MD3200i and MD3220i Series Arrays

6. Controllers

In the clustered solution, each PowerVault NX3500 controller has two

connections to the client network: two connections to the storage area

network and two controller back-to-back connections for the cluster's

internal network. Each controller is protected by a backup power

supply (BPS), which protects data during power failure.

PowerVault NX3500 software, installed on each of the controllers,

consists of an operating system, volume management, Dell Scalable

File System, and Dell's advanced clustering technology. A virtual IP

address provides access to the PowerVault NX3500 system.

The PowerVault NX3500 is equipped with a built-in traffic load

balancing mechanism. Read/write operations are handled through

mirrored Non-Volatile RAM (NVRAM). Cache data is mirrored between

the paired NAS controllers. This assures a quick response to clients'

requests while maintaining data integrity. Data from the cache to

permanent storage is transferred asynchronously according to a variety

of optimized data-placement schemes.

7. Cache

Each controller is equipped with 12 GB of RAM, most of which is used

for caching to boost performance. Writing or modifying files occurs first

in the cache. Data is then mirrored to the peer controller's cache. This

feature ensures that all transactions are duplicated and secured.

8. Backup Power Supply

Each controller receives its power from a dedicated BPS and from the

power grid. The BPS has sufficient battery power to allow the

controller to execute orderly shutdown, thus enabling the cache to be

used as NVRAM. Each controller regularly monitors the BPS battery

status and requires the BPS to maintain a minimum level of charge for

normal operation.

9. PowerVault NX3500 Software Tools

The PowerVault NX3500 solution includes configuration and

management tools, as well as snapshot and replication software.

Configuration and management of the PowerVault NX3500 solution uses

the following three tools:

PowerVault Modular Disk Storage Manager (MDSM) handles block

storage configuration and management, including the provisioning of

MD3xx0i storage for NAS.

PowerVault NAS Configuration Utility (NASCU) guides you through

network configuration and pairing the PowerVault NX3500 NAS

controllers together. It will also start the process of pairing the system