Sun Microsystems StorEdge 3000 Series, Installation, Operation And Service Manual

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A-4 Sun StorEdge 3000 Family Installation, Operation, and Service Manual • March 2004
A.2.2 Firmware Host-Side Connection Mode
The controller default is “Loop Only” in “View and Edit 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 this network can access the data in a disk
array. 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. It 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,” “read/write,” or
“exclude.”
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.
A.2.5 Firmware Dynamic Load Balancing
The controller provides a mechanism to equally distribute I/O loads between
channels in a redundant loop configuration.