Dell Compellent Series 30 - Manual (Page 442)

434 Storage Center 5.5 System Manager User Guide
Redundancy
The duplication of information or hardware equipment components to ensure that if a primary resource fails,
a secondary resource can take over its function. Storage Center provides redundancy for each component
so that there is no single point of failure. Single Redundancy protects against loss of data if any one disk
fails. Dual Redundancy protects against data lost if any two disks fail.
Remote System
A Storage Center system that sends or receives Replication data.
Remote Instant Replay
Remote Instant Replay is a Replay written to a remote backup site. The sites can be active-active, with bi-
directional remote copies that can either have matched or split intervals. Also knows as Replication.
Remote System
A Storage Center system that is receiving Replication data.
Replay
A fully usable copy of a defined collection of data that contains an image of the data as it appeared at the
point in time at which the copy was initiated. For more information, refer to Data Instant Replay.
Replay Profile
Set of rules for taking Replays that is applied to all volumes using that profile.
Replication
Replication is the process of duplicating data from one highly available site to another. The replication
process can be synchronous or asynchronous; duplicates are known as Replays.See Remote Instant
Replay.
S
SAN
A storage area network (SAN) is a specialized network that provides access to high performance and highly
available storage subsystems using block storage protocols. The SAN is made up of specific devices, such
as host bus adapters (HBAs) in the host servers, switches that help route storage traffic, and disk storage
subsystems. The main characteristic of a SAN is that the storage subsystems are generally available to
multiple hosts at the same time, which makes them scalable and flexible. Compare with NAS.
SAS
Serial Attached Storage. For more information about SAS, refer to the Storage Center System Connectivity
Guide.
SBOD
Switched Bunch of Disks.