When you add new disks to a server and you intend to use them for SQL Server log and data files, there are some suggested best practices in preparing the disks. I suggest you read this post, then read the resources below before taking any action. Some of the configuration values in the Partitioning and Formatting steps below are not universally agreed upon despite strong evidence to support their validity. It is important that you understand the nature of your environment and come to your own conclusions regarding configuration before you proceed. [Read more…] about Partitioning and Formatting Disks for SQL Server Performance
Adding LUNs to a SQL Server Cluster
When you add a new LUN to a SQL Server cluster, you start by adding it as a partition under Windows Disk Management. However, SQL Server will not recognize the partition at this point. You must also add the disk resource to the dependency list for the SQL Server resource in the cluster.
RAID for Log Files
Transaction log files should be optimized for sequential IO and secured against a single point of failure. Accordingly, RAID1 (mirroring) or RAID 10 (striping across mirrors) is recommended for transaction logs.