C o n f i g u r i n g t h e E F 2 8 0 0
DataDirect Networks EF2800 FC RAID Storage System User Guide (V 1.0)
305
H.4
Understanding LUNs and Viewing LUN Information
Each SM module supports up to 64 FC logical unit numbers (LUNs), or
128 after a failover, that are numbered zero through 63. There are three
different types of LUNs: CAPI, EMP, and partition. You can view
information about each LUN (see section
H.4.1
).
The three types of LUNs have the following characteristics:
• CAPI LUN: Allows CAPI to configure the SM module. Each EF2800
can have a CAPI LUN. You only need to assign a CAPI LUN if you
are using CAPI to configure the EF2800 over a host channel using
SCSI protocol extensions. If you are not using CAPI, you can set the
CAPI LUN to NONE. If you are using CAPI, you can set it to a value
of 0-63. For more information about changing the CAPI LUN, see
section
H.3
.
Note
: Most UNIX, Linux, and Macintosh operating systems require
that the CAPI LUN be set to a higher value than all array LUNs.
Before creating your first array, change the CAPI LUN to a higher
value. If you are using a custom software application to configure
and manage the controller (this application uses CAPI to
communicate with the controller), you must have a CAPI LUN. If
you are not using a custom application, and therefore are not using
CAPI, select NONE as the CAPI LUN. This allows your first array
to be seen at LUN 0.
• EMP LUNs: Allow access to EMPs. You can set an EMP LUN to a
value of 0-63 or NONE. NONE means that the EMP cannot be
accessed via a LUN. For information about changing the EMP LUN,
see section
G.2.1
,
"Setting the EMP LUN" on page 294
.
• Partition LUNs: Allow access to partitions on the SM module. You
can set partition LUNs to any numeric value from 0-63. For
information about changing the partition LUN, see section
D.3.5
,
"Changing a Partition LUN" on page 245
.
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