Database Server Disk Configuration
For medium and large implementations the database should be configured for high performance throughput. In particular database performance is significantly affected by the way that the database server disks are configured. Organisations requiring this size of server will generally have their own database administrators who are familiar with this level of planning, however, for clarity the following shows a typical disk configuration:
Disk Group 1 | 8 x 300 GB in RAID5 configuration (Used for Oracle Data Tablespace) Format the stripe with a block size that is optimal for data throughput. (typically 4Kb) |
Disk Group 2 | 4 x 146 GB in RAID 1+0 configuration (Used for Oracle Redo) Format the mirror with a block size of 512 bytes. 2 redo groups multiplexed |
Disk Group 3 | 2 * 146 GB in RAID 1+0 configuration (Used for Oracle Undo) Format the mirror with 4Kb block size |
Specification for a minimal installation or testing platform
With 8 * 146Gb drives in a Raid 5 configuration, there is approximately 800GB of usable space. The server disks should be configured as a RAID 5 array and partitioned as follows:
Partition | Approx. Size | Purpose | Mount point |
1 | 20 GB | Operating System | |
2 | 20 GB | Paging | |
3 | 400 GB | Database files | /u01 or c:/u01 Referred to below as $database |
4 | 200 GB | Application installations and file data | /u02 or c:/u02 Referred to below as $app |
5 | 100 GB | Archive Log space | /archive or c:/archive |
Notes: All file system path names are written using a forward slash ‘/’ directory separator. On Windows forward and back slashes are considered to be equivalent, though there are still a few areas where back slashes must be used.
Specification for a medium installation
Three Disk groups will have the following usable space:
Disk Group | Nbr Drives | Raid | Approx Usable Space |
Disk Group 1 | 8 * 300GB | 5 (7+1) | 1900GB |
Disk Group 2 | 4 * 146GB | 1+0 | 270GB |
Disk Group 3 | 2 * 146GB | 1+0 | 135GB |
Disk Group 1
With 8 * 300Gb drives in a Raid 5 configuration, there is approximately 1900GB of usable space. The server disks should partitioned as follows:
Partition | Approx. Size | Purpose | Mount point |
1 | 20 GB | Operating System | |
2 | 20 GB | Paging | |
3 | 1400 GB | Database files | /u01 or c:/u01 Referred to below as $database |
4 | 200 GB | Application installations and file data | /u02 or c:/u02 Referred to below as $app |
5 | 100GB | Archive Log | /archive or C:/archive |
Disk Group 2
With 4 * 146Gb drives in a Raid 1+0 configuration, there is approximately 270GB of usable space. The server disks should be partitioned as follows:
Partition | Approx. Size | Purpose | Mount point |
1 | 200 GB | Oracle Redo | /redo1 |
2 | 200 GB | Oracle Redo | /redo2 |
Disk Group 3
With 2 * 146Gb drives in a Raid 1+0 configuration, there is approximately 135GB of usable space. The server disks should be partitioned as follows:
Partition | Approx. Size | Purpose | Mount point |
1 | 130 GB | Oracle Undo | /undo |