Single Instance Storage - HP StorageWorks X1800sb - Network Storage Blade User Manual

Mapping Setup Wizard. After completing the initial Microsoft Services for NFS configuration, you
can use the Microsoft Services for NFS console for ongoing maintenance and administration.
If you are using Windows Storage Server 2008 in an environment that does not include an Active
Directory directory service domain, you can install Active Directory Application Mode (ADAM) on
your storage system to provide user name mapping for NFS. Microsoft Services for NFS can use any
RFC 2307 compliant Lightweight Directory Access Protocol (LDAP) service to provide username
mapping services.
For more information, see the Windows Storage Server 2008 Help.

Single Instance Storage

The Single Instance Storage (SIS) feature reduces the amount of space that is used to store data on a
volume. SIS does this by replacing duplicate files with logical links that point to a single copy of the
file in the SIS Common Store, which is a hidden folder that is located in the root directory of the
volume.
SIS consists of two primary components that together maintain a database of file signatures. These
components include:
• Groveler service - The Groveler service scans the hard-disk volumes on a server for duplicate
copies of files. If the service locates duplicate copies of files, the information about the duplicates
is sent to the Single Instance Storage Filter. The Groveler service runs as a user-level service.
• Single Instance Storage Filter - The Single Instance Storage Filter is a file system filter service that
manages duplicate copies of files on hard-disk volumes. When notified by the Groveler service
of duplicate copies of files, this component copies one instance of a duplicate file into a central
folder. The duplicate is then replaced by a link (a reparse point) to the central copy. The link file
contains information about the original file, such as its current location, size, and attributes. The
Single Instance Storage Filter runs in kernel mode.
The Single Instance Storage Filter service cannot be stopped. If this service is disabled, the linked files
are not accessible. If the central folder is deleted, the linked files can become permanently inaccessible.
If you stop the Groveler service, the files cannot be automatically linked, but the existing linked files
can still be accessible.
You can enable SIS on a maximum of 20 volumes per computer. SIS cannot act upon any files that
are referenced through junction points, and it cannot be used with any file system except the NTFS
file system. SIS will not process files that are 32 kilobytes or less in size.
If you need to access data that is stored on a SIS volume, which might be required for backup and
recovery operations, you must either run or have installed Single Instance Storage Filter on your
computer.
Backup and recovery by using SIS has the following requirements:
• The backup software used must support SIS-enabled volumes.
• The SIS volume, SIS Common Store folder, and reparse points (links) to the files must be restored
to a Windows 2000 NTFS version 5.0 (or later) file system or partition that supports reparse points
or junction points.
• The Single Instance Storage Filter must be installed or enabled to access the data in the SIS volume.
• The backup program must be capable and configured to backup and restore the reparse points
or junction points (links) to the files, and the SIS volume and the SIS Common Store folder must
be selected.
For more information, see the Windows Storage Server 2008 Help.
X1800sb and X3800sb Network Storage Blade 17