HP StorageWorks X1600 12TB SATA Network Storage System User's Guide download pdf (Page 99)

Node-based cluster groups

Creating only one resource group and one virtual server for each node facilitates group and resource

administration. This setup allows administrators to include all file share resources under one group.

Clients access all of the resources owned by one node through a virtual server name.

In node-based cluster groups, each group has its own network name and IP address. The administrator

decides on which node to place each physical disk resource. This configuration provides a very coarse

level of granularity. All resources within a group must remain on the same node. Only two IP addresses

and network names are required. This configuration creates less overhead for resource and network

administration. A possible disadvantage of this approach is that the resource groups can potentially

grow large when many file shares are created.

Load balancing

The creation of separate cluster groups for each virtual server provides more flexibility in balancing

the processing load on the cluster between the two nodes. Each cluster group can be assigned to a

cluster node with the preferred owner parameter. For example, if there are two cluster groups, the

cluster could be set up to have the first cluster group owned by Node A and the second cluster group

owned by Node B. This allows the network load to be handled by both devices simultaneously. If

only one cluster group exists, it can only be owned by one node and the other node would not serve

any network traffic.

File share resource planning issues

CIFS and NFS are cluster-aware protocols that support the Active/Active cluster model, allowing

resources to be distributed and processed on both nodes at the same time. For example, some NFS

file share resources can be assigned to a group owned by a virtual server for Node A and additional

NFS file share resources can be assigned to a group owned by a virtual server for Node B.

Configuring the file shares as cluster resources provides for high availability of file shares. Because

the resources are placed into groups, ownership of the files can easily move from one node to the

other, as circumstances require. If the cluster node owning the group of file shares should be shut

down or fail, the other node in the cluster will begin sharing the directories until the original owner

node is brought back on line. At that time, ownership of the group and its resources can be brought

back to the original owner node.

Resource planning

1. Create a cluster group for each node in the cluster with an IP address resource and a network

name resource.

Cluster resource groups are used to balance the processing load on the servers. Distribute

ownership of the groups between the virtual servers.

2. For NFS environments, configure the NFS server.

NFS specific procedures include entering audit and file lock information as well as setting up

client groups and user name mappings. These procedures are not unique to a clustered deployment

and are detailed in the Microsoft Services for NFS section within the “Other network file and

print services” chapter. Changes to NFS setup information are automatically replicated to all

nodes in a cluster.

3. Create the file share resources.

HP X1000 and X3000 Network Storage System User Guide 99

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HP StorageWorks X1600 12TB SATA Network Storage System User's Guide Page 99