Software And Hardware - HP X300 Data Vault Overview

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QuickSpecs

Software and Hardware

Operating System

Microsoft Windows Home

Server Drive Extender

Software

Microsoft Windows Home Server

The Windows Home Server operating system backup engine stores data at the cluster level. Clusters are

typically 4 kilobytes (KB) in size. The backup database records include clusters and hashes of these

clusters (a hash is a number that uniquely identifies a cluster based on its contents). The database also

contains information on the structure of a hard disk volume (NTFS information).

During the backup process, a cluster from one computer that is identical to a cluster from a different

computer is sent to the server exactly once and stored exactly once. Because Windows Home Server

backs up multiple computers (space) every day (time) to a single database, it in essence supports "single

instancing of computer backups across space and time."

When the cluster size is different among volumes, no data is shared between the volumes in the backup

database. By default, every newly created NTFS volume gets a cluster size of 4 KB. A few volumes that

started out as FAT and were converted to NTFS have a cluster size of 512 KB. The only way to get any

other cluster size is to format the volume yourself and explicitly request a different size.

NOTE:

NOTE: You can maximize the efficiency of the Data Vault backup database by ensuring that all of the

NOTE:

hard drives on your computers are formatted with NTFS and with a cluster size of 4 KB.

The backup database is a collection of files that can be broken into three categories:

The backup database is a collection of files that can be broken into three categories

Global files

Global files - Files that track the history of all computer backups and all of the other files in the

backup database.

Cluster files

Cluster files - Files that store the actual cluster data from the computers. These are usually in

4096 byte increments. These files grow to 4 GB in size before a new file is created. These files are

stored as Data.XXXX.Z.dat, where XXXX=cluster size in bytes, and Z=0,1,2,...

Computer specific files - A boot record and data for each hard drive volume that gets backed up

Computer specific files

from each computer.

Windows Home Server Drive Extender

Windows® Home Server Drive Extender enables you to use internal and external hard drives for

additional storage. In addition, you can enable Folder Duplication for specific shared folders.

Maintaining two copies of a shared folder on separate hard drives helps protect against the failure of a

single hard drive.

Features and Functionality

The core features of Windows Home Server Drive Extender are:

Predefined Shared Folders: Your device is preconfigured with shared folders named Photos,

Predefined Shared Folders

Music, Videos, Public, and Software. From the Data Vault Windows Home Server Console you

can specify user permissions for these folders and create new shared folders. You can easily move

files and folders from your local computers into the shared folders by using a drag-and-drop

operation.

Easy to add more storage

Easy to add more storage: From the Data Vault Windows Home Server Console, you can add a

Easy to add more storage

new hard drive by following a simple wizard. The amount of storage available to your shared

folders and local computer backups increases proportionally. The hard drives you add can be

either internal or external (for example, USB 2.0 or FireWire).

Shared Folder duplication: If you have two or more hard drives, the Windows Home Server

Shared Folder duplication

DA - 13622

Worldwide — Version 2 — June 9, 2011

HP X300 Data Vault

Page 4

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Software And Hardware - HP X300 Data Vault Overview

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