Compaq ProLiant 3000 Compaq ProLiant Cluster HA/F100 and HA/F200 Administrator - Page 61
Array Configuration, The Compaq Array Configuration Utility ACU is used to initially con
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2-30 Compaq ProLiant Clusters HA/F100 and HA/F200 Administrator Guide For example, the Web Sales Order Database group depends on a log file, data files, and program files. It might be important for the log file and program files to have a quick recovery time, while performance would be a secondary concern. Together, the files do not take up much capacity; therefore, mirroring (RAID 1) would be an efficient use of disk space and would fulfill the recovery and performance characteristics. The data files, however, would need excellent performance and excellent protection. The data files are expected to be large; therefore, a mirrored configuration would require an unacceptably expensive number of disk drives. To minimize the amount of physical capacity and still meet the performance and protection requirements, the data files would be configured to use Distributed Data Guarding (RAID 5). Array Configuration The Compaq Array Configuration Utility (ACU) is used to initially configure the array controller, reconfigure the array controller, add additional disk drives to an existing configuration, and expand capacity. The capacity expansion feature provides the ability to add storage capacity to a configured array without disturbing the existing data and to add a new physical drive to the array. An array is created by grouping disk drives together to share a common RAID (Redundant Array of Inexpensive Disks) fault tolerance type. For example, in a single RA4000 storage system containing eight 18.2 GB drives, you could configure two of the drives in a RAID 1 mirrored array and the remaining six drives as a RAID 5 Distributed Data Guarding array. Each array must be divided into at least one volume (up to a maximum of eight volumes per array). Each volume is presented to the operating system as an independent disk drive and can be independently controlled by the cluster software. Using the previous example, you could configure the two-drive RAID 1 array as a single volume (for example, drive F), and the six-drive RAID 5 array as two volumes (for example, drives G and H). Because the operating system views these as independent disks, it is possible for cluster Node1 to control drive G, while cluster Node2 controls drives F and H. More information regarding cluster disk configuration can be found in the Compaq TechNote, Planning Considerations for Compaq ProLiant Clusters Using Microsoft Cluster Server, located on the Compaq website (http://www.compaq.com). This capability provides a high level of flexibility in configuring your RA4000 storage system. However, minimize the number of volumes configured in each array to improve performance. To achieve optimal performance, each array should contain a single volume. In some cases (such as for the MSCS quorum drive), it may be desirable to add a second, smaller volume to an array.