Target group - The targets over which this LUN is exported.
Initiator group(s) - The initiators that can access this LUN. As of the 2013.1.0 software
release, multiple initiator groups can be assigned to a LUN. When editing initiator groups, checking
the PERSIST checkbox (the default) preserves the LUN number for the corresponding initiator group.
If unchecked, the ZFSSA may reassign the LUNs after a SAN configuration change or a reboot.
LU (logical unit) number - As LUNs are associated with target and initiator groups, they are
assigned unique logical unit numbers per target group and initiator pair. No two LUNs that are
accessible by an initiator through a target group may share a logical unit number. This property
controls whether a logical unit must have number zero or an automatically assigned number.
Operational status - The operational status of this LUN. An offline LUN is inaccessible to
initiators regardless of target or initiator configuration.
Write cache behavior - This setting controls whether the LUN caches writes. With this setting
off, all writes are synchronous and if no log device is available, write performance suffers
significantly. Turning this setting on can therefore dramatically improve write performance, but can
also result in data corruption on unexpected shutdown or failover unless the client application
understands the semantics of a volatile write cache and properly flushes the cache when necessary.
Consult your client application documentation before turning this on.
GUID - A LUN's GUID is a globally unique, read-only identifier that identifies the SCSI
device. This GUID remains consistent within different head nodes and replicated environments.