Typical cluster configurations typically include a shared disk subsystem connected to all servers in the cluster. The shared disk subsystem can be connected using high-speed cards, cables, and Fiber Channel switches, or configured to use shared SCSI devices.
The following components are components of a Novell Cluster Services Cluster:
2 to 32 NetWare servers configured to use IP. Each server must have at least one local disk device (used for the local SYS 🙂 volume.
Each NetWare server in the cluster must have Novell Cluster Services software running.
Shared disk subsystem connected to all cluster servers.
High-speed Fiber Channel cards, cables and switches, or SCSI cards and cables used to connect servers to a shared disk subsystem.
Additional network equipment – network cards for each server and a hub (switch) for exchanging data on the health status of servers in the cluster. This equipment is not necessary, since server status data can also be transmitted through a public network.
The following list defines the hardware requirements for installing Novell ® Cluster Services ™. These requirements correspond to the minimum hardware configuration:
At least two NetWare 5.x, 6 servers.
At least 256 MB of memory on all servers in the cluster (512 MB is recommended for switching several applications to one server in the event of a failure).
At least one local disk device (not shared) for the SYS volume: on each server.
Additional equipment may be needed; it depends on how you intend to use the Novell Cluster service.
Each cluster server must be running NetWare5.x or 6. In doing so, the following requirements must be met:
All servers in the cluster must be configured for IP and are located on the same IP subnet.
An additional IP address for the cluster and each cluster resource, as well as a volume with cluster support enabled.
All servers in the cluster must be in the same eDirectory ™ tree.
Shared disk subsystem requirements.
To ensure high data availability of each cluster, a shared disk subsystem (Storage Area Network or SAN) is required, which has the following requirements:
The shared disk subsystem must be compatible with NetWare. To verify this, you can issue the LIST DEVICES command on each server that is added to the cluster.
Disks included in the shared disk subsystem must be configured to work in reflection mode (mirror) or RAID 5 to increase the resiliency of the shared disk subsystem.
An NSS must be configured on the disk subsystem.
The shared disk subsystem must contain 10-15 MB of free disk space to create a special cluster partition.
In concluding our discussion of NCS capabilities, it should be noted that in one eDirectory ™ tree, a cluster for NetWare 5.x with NCS 1.0.1 and a cluster for NetWare 6 with NCS 1.6 can coexist without conflict. The resources of both clusters are managed from one point using ConsoleOne or Remote Manager. This is a great illustration of the Novell Do Not Throw or Do Not Change model for your products.