A-4 Sun StorEdge 3000 Family Installation, Operation, and Service Manual • May 2004
A.2.1 Hardware Loop ID
Each device communicating on an arbitrated loop requires an AL_PA, the Arbitrated
Loop Physical Address. The host Fibre Channel supports a single hard loop ID in the
range from 0 to 125. The drive channel allows up to 125 devices to be connected to a
single loop.
The controller supports automatic loop ID assignment on the drive channel. A hard
loop address ID is assigned to the disk drives by setting the radial switch.
A.2.2 Firmware Host-Side Connection Mode
The controller default is “Loop Only” in “Host-side Parameters.”
A.2.3 Firmware LUN Filtering (RAID-Based Mapping)
LUN filtering is a method used for separating and controlling access to data from the
RAID controller. One major benefit of Fibre Channel is the capability to share a
common storage pool with multiple servers or workstations. However, allocation
becomes an issue when every server in a network can access the data in a logical
drive. LUN filtering provides a means for controlling data access if data is not
allowed for every server.
When you map a logical drive to a host LUN through the firmware application, you
can create a mapping according to the WWPN port names that are specific to each
host adapter. A LUN mask can then be created as an access filter for including or
excluding host adapters from addressing specific storage unit. A host map is
composed of an ID range that is configured to include one or more IDs. A host
adapter can be identified by its ID (device-specific port names) as included or
excluded from range. The LUN mask is also defined with a filter type as read only or
read/write.
A.2.4 Firmware Redundant Loops
The selection of “drive-side dual-loop” is fixed. Since two channels are used to
connect a group of physical drives, the two channels automatically assume the same
ID address and operate in duplex mode.
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