Data protection overview

An Isilon cluster is designed to serve data even when components fail. By default, OneFS protects data with erasure codes, enabling you to retrieve files when a node or disk fails. As an alternative to erasure codes, you can protect data with two to eight mirrors.

When you create a cluster with five or more nodes, erasure codes deliver as much as 80 percent efficiency. On larger clusters, erasure codes provide as much as four levels of redundancy.

In addition to erasure codes and mirroring, OneFS includes the following features to help protect the integrity, availability, and confidentiality of data:

OneFS can send files to servers running the Internet Content Adaptation Protocol (ICAP) to scan for viruses and other threats.
OneFS enables you to create clones that share blocks with other files to save space.
NDMP backup and restore
OneFS can back up data to tape and other devices through the Network Data Management Protocol. Although OneFS supports both three-way and two-way backup, two-way backup requires an Isilon Backup Accelerator Node.
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IsilonSD Edge supports only the three-way NDMP backup.

Protection domains
You can apply protection domains to files and directories to prevent changes.

The following software modules also help protect data, but they require you to activate a separate license:

Licensed Feature
SyncIQ replicates data on another Isilon cluster and automates failover and failback operations between clusters. If a cluster becomes unusable, you can fail over to another Isilon cluster.
You can protect data with a snapshot—a logical copy of data stored on a cluster.
The SmartLock tool prevents users from modifying and deleting files. You can commit files to a write-once, read-many state: The file can never be modified and cannot be deleted until after a set retention period. SmartLock can help you comply with Securities and Exchange Commission Rule 17a-4.