Map Devices - ATTO Technology XstreamCORE ET 8100T Installation And Operation Manual

The ATTO XstreamCORE 8100T allows SAS tape devices to
participate in an iSCSI fabric. iSCSI and SAS use different
models to address devices. The XstreamCORE translates
between these addressing models.
XstreamCORE Mapping Modes
The XstreamCORE presents a number of iSCSI target nodes on
the network, each identified by an iSCSI IQN. The IQN consists
of two parts: a fixed portion based on the product name and
serial number, and a target name. The XstreamCORE features
two mapping modes: automatic and manual. Automatic
mapping creates iSCSI targets based on SAS topology without
the need for user configuration. Manual mapping mode
allows the user to create up to four iSCSI targets and select
which tape devices to associate with each iSCSI target. A tape
device may only be associated with one iSCSI target node at a
time. In manual mapping the user has the ability to group
multiple devices to a single iSCSI target.
Each target node can be accessed by one or more network
portals. Each network portal is identified by its IP address and
listening TCP port. All target names and available target
portals are transmitted to a host using the standard iSCSI
sendtargets discovery mechanism.
Exhibit 4 - Automatic iSCSI Mapping Mode

3 Map Devices

Tape devices connected to the XstreamCORE are viewed as
Ethernet LUNs to the host computer. Each device has a
unique LUN within an iSCSI target node.
CLI command ShowDevices will display device information
for all supported tape devices currently connected.
Automatic mapping mode
The XstreamCORE 8100T is set to automatic mapping mode
by default. In this mode, the XstreamCORE will create maps
for each SAS PHY that has tape devices attached. Tapes and
changers are grouped into targets based on what SAS PHY
they are connected to. When devices are disconnected, the
mappings are automatically deleted. Moving a device from
one SAS PHY to another moves the device from one iSCSI
target to another. Automatically created targets are
accessible through both data ports by default but may be
isolated to a specific data port using CLI command
iSCSISetPorts. The iSCSIShowMaps command reports the
fully qualified target names and LUNs associated with each
target.