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| Planning disk groups and volumes | ||
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| Prev | Creating SFW disk groups and volumes | Next |
Decide how you want to organize the disk groups and the number and type of volumes you want to create.
Before creating a disk group, consider:
The type of volume configurations that are required.
The number of LUNs required for the disk group.
The implications of backup and restore operations on the disk group setup.
The size of databases and logs which depend on the traffic load.
The number of disk groups that are needed:
The number of disk groups depends on your application and the planned organization of the data. The application program files need to be installed on the local drive of the server. Data files and other related files, such as logs, are placed on the shared storage. Typically, a main organizational unit in your application, such as the storage group in Microsoft SQL Server, is contained in a single disk group.
You will also need to create a disk group with three disks and a mirrored volume for the quorum resource. If possible, use small disks. Microsoft recommends 500 MB for the quorum disk.
See Implementing a dynamic quorum resource.
Recommendations:
The following illustration shows a typical setup of shared storage disks for a clustered database application and a dynamic mirrored quorum resource. The log volume is on a separate disk. The log and data volumes are in the application dynamic cluster disk group. The dynamic mirrored quorum is in a separate disk group and has a minimum of two disks, but three are recommended for added fault tolerance.
