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Chapter 5
First-Time Configuration
5-53
An advantage of LUN filtering is that it allows many hosts to attach to an array
through a common Fibre Channel port and still maintains 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 logical drive.
Note –
It is possible to see somewhat different information when a Fabric switch
queries the WWN of the Sun StorEdge 3510 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, which is the inquiry data returned
by the RAID controller.
As shown in
, 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.
Prior to using the LUN Filter feature, identify which array is connected to which
HBA card, and the WWN assigned to each card. This procedure varies according to
the HBA you are using. Refer to the appendix for your host for instructions on
identifying the WWN for your host.
5.6.4.1
Creating Host Filter Entries
The “Create Host Filter Entry” command is used when multiple hosts share the
same loop, can view all the drives, and need to be filtered so that a host sees only the
logical drives that are exclusive to its use.
“Map Host LUN” is used when multiple hosts are
not
on the same loop. To use this
option, see
“Using the Map Host LUN Option” on page 5-50
Note –
You can create a maximum of 128 host filters.
Note –
If you plan to map hundreds of LUNs, the process is easier if you use the
Sun StorEdge Configuration Service program.
Содержание StorEdge 3000 Series
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