If you are referring to HLU (Host Lun ID) , it is the identity assigned to the LUN (which will be represented from array side by ALU - Array Lun ID) for host identification. Host will not be aware of the ALU of the LUN assigned to it and it will be using HLU.  HLU/ALU numbers  Mapping the LUN to a specific port and masking is done with Symmetrix systems. With Clariion Systems, we have to create a storage group and then add the LUNs and registered hosts to the same. This is the LUN masking in Clariion/VNX.
Hi,   Please I like to check a thing in which I am confused.  During the creation of a LUN,i saw that there is also necessary to assign an hostid to this LUN,Is this lun mapping?What is the hostid?Is somehow the wwpn of an hba this hostid? Other way is like below: Then also I saw that there is necessary to map the lun to a certain port in Clariion(wwpn),who is connected to the server who need to see the new lun.This is lun mapping.right? then on the server we could perform lun masking if we like to see only a part of the total luns mapped to a certain port in controller of Clariion.  tnx a lot, marius
lun mapping and masking