Clustering SQL 2000 with SAN

Clustering SQL 2000 with a SAN Consulting Services

Because multiple servers have direct access to storage devices, SAN technology is particularly interesting as a way to build clusters where shared access to a data set is required. In a clustered SQL Server environment. At any point in time a SQL Server instance may be hosted on one machine in the cluster and it must have exclusive access to its associated database on a disk from the node on which it is hosted. In the event of a failure or an explicit management operation, the SQL Server instance may failover to another node in the cluster. Once failed over, the SQL Server instance must be able to have exclusive access to the database on disk from its new host node.

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What is a SAN

A storage area network (SAN) is defined as a set of interconnected devices (for example,  disks and tapes) and servers that are connected to a common communication and data transfer infrastructure such as Fibre Channel. The common communication and data transfer mechanism for a given deployment is commonly known as the storage fabric. The purpose of the SAN is to allow multiple servers access to a pool of storage in which any server can potentially access any storage unit. Clearly in this environment, management plays a large role in providing security guarantees (who is authorized to access which devices) and sequencing or serialization guarantees (who can access which devices at what point in time).

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SAN Clustering Overview

Storage area networks provide a broad range of advantages over locally connected devices. They allow computer units to be detached from storage units, thereby providing flexible deployment and re-purposing of servers and storage to suit current business needs. You do not have to be concerned about buying the right devices for a given server, or with re-cabling a datacenter to attach storage to a specific server.

Microsoft fully supports storage area networks both as part of the base Windows platform, and as part of a complete Windows Clustering, high availability solution. One or more server clusters can be deployed in a single SAN environment, along with standalone Windows servers and/or non-Windows-based platforms

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