Iscsi Disks - Overland Storage SnapServer Administrator's Manual

SnapServer 7.0 Administrator's Guide
At the confirmation page, click the Rollback button again. The Storage > Volumes page is
displayed showing the rollback progress.
IMPORTANT: A rollback can disable Snap EDR and result in its removal. If this occurs,
download Snap EDR from the SnapServer website, reinstall it using the OS Update feature,
then re-enable and configure it from the SnapExtensions page.

iSCSI Disks

Internet SCSI (iSCSI) is a standard that defines the encapsulation of SCSI packets in
Transmission Control Protocol (TCP) and their transmission via IP. On SnapServers, an
iSCSI disk is based on an expandable, RAID set-protected volume, but appears to a client
machine as a local SCSI drive. This storage virtualization frees the administrator from the
physical limitations of direct-attached storage media and allows capacity to be expanded
easily as needed. Unlike standard SnapServer volumes, SnapServer iSCSI disks can be
formatted by the iSCSI client to accommodate different application requirements.
Connectivity to the iSCSI disk is established using a software package or PCI card, known
as an initiator, that must be installed on a client machine. The initiator sees the
SnapServer as a "target portal" and an iSCSI disk as a "target."
To use the SnapServer as an iSCSI target, you need to configure iSCSI on both the client
initiating the iSCSI connection, and on the SnapServer. Use the information presented here
in conjunction with the documentation supplied with your initiator to install, configure, and
connect the iSCSI initiators to the SnapServer.
iSCSI Disk Limitations:
• The the size of any iSCSI disk is limited to 2 TB.
• GuardianOS can maintain up to 256 iSCSI disks.
For Additional Information:
The following resources provide further information you may need to plan and complete
your iSCSI implementation.
10400317-001 10/2011
©2010-11 Overland Storage, Inc.
6 – Other Storage Options
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