EMC Avamar Data Store Gen4T, Customer Service Manual, Page: 11 / 32

Switches A and B at the top are ADS internal network switches. Switch A is the bottom
one.
The minimum ADS multi-node configuration is one utility node and three storage nodes.
The maximum is 1 utility node, 16 active storage nodes, and an optional spare storage
node.
Utility node
In scalable multi-node Avamar servers, a single utility node provides essential internal
services for the server (for example, administrator server, replication, external
authentication, network time protocol [NTP], and Web access). Because utility nodes are
dedicated to running these essential services, they cannot be used to store backups.
Single node Avamar servers
Single node servers are individual Avamar storage nodes configured to perform both
utility node and storage node functions. The information in the following chapters
accounts for both single node and multi-node CRU servicing.
NDMP accelerator node
An Avamar NDMP accelerator (accelerator node) is a dedicated single-node Avamar client
that, when used as part of an Avamar system, provides a complete backup and recovery
solution for supported EMC Isilon, VNX, VNXe, and Celerra systems, and NetApp filers by
using Network Data Management Protocol (NDMP) to communicate with these storage
devices. It is not part of the ADS server.
Recommended tools and supplies
To perform the CRU replacement procedures in the chapters that follow, no tools or
additional supplies are required.
The PuTTY SSH client will be used throughout the CRU replacement procedures.
Node components
Before handling ADS Gen4T equipment, first familiarize yourself with the Gen4T node
types and component locations for your specific hardware. See the figures and tables
that follow for details.
Figure 2 Front View
Replacing Avamar Data Store Components
Utility node
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