Access Logix is a storage system-based licensed software. This feature lets you enable data access and create storage groups on shared storage systems. This software runs on each storage processor.
Storage group is a collection of one or more LUNs (or metaLUNs) to which you connect one or more servers. In other words think of a Storage group as a container, when you define:
All servers within one storage group can access all LUNs that are in the same storage group. This is called LUN masking.
Below is a diagram of a storage system attached to two hosts. Each host has a storage group associated with it – storage group A for Server A, and storage group B for Server B. The LUNs used on the storage system are sequential, from 0 through 7, but it’s not always like that, and actually you can set it up differently if you wish. ALU is Array Logical Unit, and HLU is Host Logical Unit. Each LUN on the storage system (ALU) has been mapped to a LUN number as seen by the host (HLU).
The mappings are stored in a translation table, which is part of the Access Logix database. Each server sees the LUNs prezented to it as though they are the only LUNs on the ‘virtual storage system’, represented by the storage group.
While using Fibre Channel, access to the LUNs is controlled by an Access Control List (ACL) which contains the 128-bit Globally Unique ID (UID) of the LUN, and 128-bit Unique IDs of the HBAs in the host. The HBA UID consists of the 64-bit WWNN followed by the 64-bit WWPN.
Each request for LUN access references the ACL, in order to determine whether or not a host should be allowed access.
Registration is a process of making a host known to the storage system. Connectivity depends on the protocol being used, Fabric logins tell the VNX which ports and HBAs are connected, iSCSI logins tell the VNX which ports and initiators are connected. Registration can be perfomed in a number of ways:
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