Dell PowerVault NX1950 User Manual download pdf (Page 16)

16 Deployment Guide

For example, you can query all documents containing the word product or you

can query for all Microsoft Office documents written by a specific author. The

Indexing service returns a list of all documents that meet your search criteria.

NOTE: Indexing is not supported in clustered environments.

Single Instance Storage

SIS recovers disk space by reducing the amount of redundant data stored in a

volume. To recover the disk space, SIS performs the following procedures:

• Identifies identical files

• Stores one copy of the file in the SIS common store

• Replaces the files with pointers to the file in the SIS common store

For example, User A and User B receive the same e-mail with an attachment.

Both users save the attachment to their home folder. SIS detects the two

identical files on the volume, moves one of the copies into the SIS common

store, and then replaces both files with a pointer to the file in the SIS

common store.

Subsequently, User A makes a change to the file. SIS immediately detects that

an update is pending for the file, removes the pointer in the user’s home folder,

and replaces the pointer with a copy of the file in the SIS common store.

The updates are then applied to a fresh copy of the original file. This process

is completely transparent to the application.

The User B file remains in the SIS common store with a pointer in the User B's

home folder, even if there is only one pointer to the file. When User B updates

the file (assuming there are no other pointers), the pointer is deleted and

replaced with a copy of the original file. The file in the SIS common store is

then deleted.

SIS works in the background and does not require user intervention.

The administrator can enable SIS on a per-volume basis. For best results, the

administrator should use a backup application that supports SIS.

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Dell PowerVault NX1950 User Manual Page 16