A.1. Metadata
In an Xsan, your Metadata is the information about where on the physical disks your files are found, how many pieces they're in, how to assemble those pieces when a client requests a file, and which clients have those files locked for writing. Metadata should be stored on a dedicated Fibre Channel LUN (logical unit number, which each logical segmentation of a target storage device has to uniquely identify it within the target storage). It is very important that it live on a mirrored RAID set, to lessen the risk of it being lost.
Xsan storage is broken down into three parts:
LUN: "Logical Unit Number". A logical grouping of drives into a single entity. Usually a RAID set, but it could be a single drive.
Storage pool: A group of LUNs. ...
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