Chapter 6 First-Time Configuration 6-43
FIGURE 6-6 Example of LUN Filtering
An advantage of LUN filtering is that it allows many hosts to attach to an array
through a common Fibre Channel port and still maintain LUN security.
Each Fibre Channel device is assigned a unique identifier called a world wide name
(WWN). A WWN is assigned by the IEEE and stays with the device for its lifetime.
LUN filtering uses the WWN to specify which server is to have exclusive use of a
specific partition.
Note – It is possible to see somewhat different information when a fabric switch
queries the WWN of the Sun StorEdge 3510 or 3511 FC Array. When the RAID
controller does a Fibre Channel fabric login to a switch, during the fabric login
process the switch obtains the WWN of the RAID controller. This WWN presented
by the RAID controller is a Dot Hill Systems Corporation WWN, so the switch
displays this company name. When the switch issues an inquiry command to a
mapped LUN on the array, the switch obtains the company name from the inquiry
data of the LUN. In this case, the switch displays Sun StorEdge 3510 or Sun StorEdge
3511, which is the inquiry data returned by the RAID controller.
As shown in
FIGURE 6-6, when you map LUN 01 to host channel 0 and select WWN1,
server A has a proprietary path to that logical drive. All servers continue to see and
access LUN 02 and LUN 03 unless filters are created on them.
WWN
(1) 210000E08B021D15
(2) 210000E08B02DE2F
(3) 210000E08B22DE2F
LUN ID LUN ID LUN ID
01 XX XX
XX
02 XX
XX XX
03
WWN1 WWN2 WWN3
AB
C
02 0301
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