| Building an Extended Distance Cluster Using Serviceguard and Software RAID |
2 | Building an Extended Distance |
| Cluster Using Serviceguard and |
| Software RAID |
Simple Serviceguard clusters are usually configured in a single data center, often in a single room, to provide protection against failures in CPUs, interface cards, and software. Extended Serviceguard clusters are specialized cluster configurations, which allow a single cluster to extend across two separate data centers for increased disaster tolerance. Depending on the type of links employed, distances of up to 100 kms between data centers can be achieved.
This chapter discusses several types of extended distance cluster that use basic Serviceguard technology with software mirroring (using MD Software RAID) and Fibre Channel. Both two data center and three data center architectures are illustrated. This chapter discusses the following:
• “Types of Data Link for Storage and Networking” on page 52
• “Two Data Center and Quorum Service Location Architectures” on page 53
• “Rules for Separate Network and Data Links” on page 57
• “Guidelines on DWDM Links for Network and Data” on page 58
Chapter 2 | 51 |
