June 22, 2015

LUN Masking

LUN Masking

“If you only implement SAN zoning, a host could gain access to every LUN that is available on any storage array in the zone.”

Beyond zoning, LUN masking allows the administrator to further lock down access to the storage unit. LUN Masking is done on the storage controller and it hides specific LUNs from specific servers.

LUN masking defines relationships between LUNs and individual servers and is used to further limit what LUNs are presented to a host.

"Zoning is controlling which HBAs can see which array service processors through the switch fabric. LUN masking is controlling what the service processors tell the host with regard to the LUNs that they can provide. In other words, the storage administrator can configure the service processor to lie about which LUNs are accessible.

"LUN masking is the ability of a host or an array to intentionally ignore WWNs that it can actively see (in other words, that are zoned to it)."

Reference

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