Overland Storage SnapServer Administrator's Manual page 122

SnapServer 7.0 Administrator's Guide
NOTE: To use Symantec's Backup Exec as your VSS-compatible backup application, you must
Each VSS snapshot of an iSCSI target requires additional space on the pool or volume on
which the iSCSI disk resides. The required space is 10% of the size of the iSCSI disk per
snapshot. If this amount of free space is not available on the pool or volume, the VSS
snapshot will not be created and an error will be reported by the SnapServer VSS hardware
provider to the Windows event log.
When creating iSCSI disks for later VSS snapshot use, be sure to leave at least 10% of the
size of the iSCSI target free on the Snap volume.
NOTE: VSS snapshots can only be taken of Windows volumes that fully consume the iSCSI disk.
1. Add the VSS client to the SnapServer.
a. From the Storage > iSCSI page, click the VSS/VDS Access button.
b. Click Add.
c. Add the hostname of the VSS client you wish to grant access and click Add (the
d. When you have finished adding VSS clients, click OK.
2. Install the VSS hardware provider on the Windows iSCSI client.
a. Depending on the Windows client, locate SnapServerToolInstall32.exe or
b. Double-click the executable (.exe) to run the Installation Wizard on the VSS
3. Configure VSS-based backups of the iSCSI disk.
a. Connect the client iSCSI initiator to the Snap iSCSI disk and create a volume (if
b. Configure a VSS-based backup of the iSCSI disk. Where applicable, choose to use
10400317-001 10/2011
first modify the registry of the Backup Exec server and agents. For instructions, see
Backup Exec for VSS-based Snapshots of SnapServer iSCSI
Snapshots of iSCSI disks that contain multiple Windows volumes are not supported.
hostname is not case-sensitive).
The client hostname should appear in the VSS/VDS Clients box.
NOTE: Use the short hostname (myclientname) of the client only. Do not use the IP
address or fully-qualified name (for example, myclientname.mydomain.com).
SnapServerToolInstall64.exe on the Overland website:
http://docs.overlandstorage.com/snapserver
client and select the VSS/VDS hardware providers option. This will add the
SnapServer hardware provider to the Windows iSCSI client.
necessary). Add data or configure applications to use the iSCSI volume for the
data repository.
the SnapServer VSS hardware provider in the backup job configuration. When the
backup job is run, the snapshot of the iSCSI disk is automatically created and
hosted by the SnapServer as a virtual iSCSI disk (named after the main iSCSI
disk with snap[n] appended), and the backup application performs the backup
using the snapshot iSCSI disk. The snapshot will be deleted after the backup
completes.
NOTE: VSS snapshots are not supported on SnapServer iSCSI disks that have been
configured into multiple Windows volumes.
©2010-11 Overland Storage, Inc.
6 – Other Storage Options
Using
Disks.
6-23