Configuring SRP Targets (CLI)
dedicated to specific LUNs or groups of LUNs. Once an FC port is configured as a target, the
remotely discovered ports can be examined and verified.
Refer to the Implementing Fibre Channel SAN Boot with Oracle's Sun ZFS Storage Appliance
white paper at http://www.oracle.com/technetwork/articles/servers-storage-admin/
fbsanboot-365291.html for details on FC SAN boot solutions using the Oracle ZFS Storage
Appliance.
In a cluster, initiators will have two paths (or sets of paths) to each LUN: one path (or set of
paths) will be to the head that has imported the storage associated with the LUN; the other path
(or set of paths) will be to that head's clustered peer. The first path (or set of paths) is active; the
second path (or set of paths) is standby. In the event of a takeover, the active paths will become
unavailable, and the standby paths will (after a short time) be transitioned to be active, after
which I/O will continue. This approach to multipathing is known as asymmetric logical unit
access (ALUA) and, when coupled with an ALUA-aware initiator, allows cluster takeover to be
transparent to higher-level applications.
Initiators are identified by their WWN. As with other block protocols, aliases can be created
for initiators. To aid in creating aliases for FC initiators, a WWN can be selected from the
WWNs of discovered ports. Also as with other block protocols, initiators can be collected into
groups. When a LUN is associated with a specific initiator group, the LUN will only be visible
to initiators in the group. In most FC SANs, LUNs will always be associated with the initiator
group that corresponds to the system(s) for which the LUN has been created.
The appliance is an ALUA-compliant array. Properly configuring an FC initiator in an ALUA
environment requires an ALUA-aware driver and may require initiator-specific tuning. See
"Oracle ZFS Storage Appliance: How to set up Client Multipathing" (Doc ID 1628999.1) for
more information.
FC performance can be observed via Analytics, whereby one can breakdown operations or
throughput by initiator, target, or LUN:
Configuring the Appliance 151
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