Device (LUN) Masking ensures that volume access to servers is controlled appropriately. This prevents unauthorized or accidental use in a distributed environment.A zone set can have multiple host HBAs and a common storage port. LUN Masking prevents multiple hosts from trying to access the same volume presented on the common storage port.LUN Masking is a feature offered by EMC Symmetrix and CLARiiON arrays. LUNs can be masked through the use of bundled tools. For EMC platforms these include ControlCenter; Navisphere or Navicli for CLARiiON; and Solutions Enabler (SYMCLI) for a Symmetrix.
When servers log into the switched fabric,the WWNs of their Host Bus Adapters (HBAs) are passed to the storage fibre adapter ports that are in their respective zones. The storage system records the connection and builds a filter listing the storage devices (LUNs) available to that WWN, through the storage fibre adapter port. The HBA port then sends I/O requests directed at a particular LUN to the storage fibre adapter. Each request includes the identity of their requesting HBA (from which its WWN can be determined) and the identity of the requested storage device, with its storage fibre adapter and logical unit number (LUN). The storage array processes requests to verify that the HBA is allowed to access that LUN on the specified port. Any request for a LUN that an HBA does not have access to returns an error to the server
Salient Features :-
1) Restricts volume access to specific hosts and/or host clusters.
2) Policies set based on functions performed by the host
3) Servers can only access volumes that they are permitted to access
4) Access controlled in the Storage Array - not in the fabric.
Makes distributed administration secure
5) Tools to manage masking
GUI & Command Line
Thanks for this useful information really helpful
ReplyDeleteand dont forget to visit Adapters for Access Control