HP StorageWorks Clustered File System 3.6.0 Windows Storage Server Edition Administration Guide (403103-005, January 2008)
Table Of Contents
- Contents
- HP Technical Support
- Quick Start Checklist
- Introduction to HP Clustered File System
- Cluster Administration
- Administrative Considerations and Restrictions
- Tested Configuration Limits
- Volume and Filesystem Limits
- User Authentication
- Start the Management Console
- Cluster Management Applications
- The HP CFS Management Console
- View Installed Software
- Start HP Clustered File System
- Stop HP Clustered File System
- Back Up and Restore the Cluster Configuration
- HP Clustered File System Network Port Numbers
- Configure Servers
- Configure Network Interfaces
- Configure the SAN
- Configure Dynamic Volumes
- Configure PSFS Filesystems
- Manage Disk Quotas
- Manage Hardware Snapshots
- Configure Security Features
- Configure Event Notifiers and View Events
- Overview
- Install and Configure the Microsoft SNMP Service
- Cluster Event Viewer
- Configure Event Notifier Services
- Select Events for a Notifier Service
- Configure the SNMP Notifier Service
- Configure the Email Notifier Service
- Configure the Script Notifier Service
- View Configurations from the Command Line
- Test Notifier Services
- Enable or Disable a Notifier Service
- Restore Notifier Event Settings to Default Values
- Import or Export the Notifier Event Settings
- Using Custom Notifier Scripts
- Cluster Operations on the Applications Tab
- Configure Virtual Hosts
- Configure Service Monitors
- Configure Device Monitors
- Advanced Monitor Topics
- SAN Maintenance
- Other Cluster Maintenance
- Management Console Icons
- Index
Chapter 15: Configure Virtual Hosts 189
• For service monitors, you can assign a priority to each monitor (the
Service Priority setting). If ClusterPulse cannot locate an interface
where all services are “up” on the underlying server, it selects an
interface where the highest priority service is “up” on the underlying
server.
Specify Failback Behavior of the Virtual Host
When you configure a virtual host, you can specify the failback action
that the virtual host will take following a failover to a backup server.
There are two options:
AUTOFAILBACK and NOFAILBACK.
AUTOFAILBACK
is the default for virtual hosts. The CIFS File Serving
feature provides an entity (Virtual File Server) that is similar to a virtual
host. This entity uses NOFAILBACK as the default.
AUTOFAILBACK
AUTOFAILBACK is intended to return the virtual host to its original
configuration, or as close to it as possible. After the virtual host fails over
to a backup server, ClusterPulse watches the health of the servers higher
in the list for that virtual host. When the health of one of these servers is
equal to or greater than the backup server where the virtual host currently
resides, the virtual host automatically attempts to fail over to that server.
NOFAILBACK
NOFAILBACK is intended to minimize failovers. The virtual host remains
active on the backup server until a healthier server (it’s health is greater
than the backup server) becomes available, at which point the virtual host
will fail over to that server.
For example, consider a two-node cluster that is configured with its
primary on node 1 and backup on node 2, and that uses the
NOFAILBACK
option. Three service monitors are configured on the virtual host. When a
service monitor probe fails on node 1, the virtual host will fail over to
node 2. Following are some possible scenarios:
• When the monitored service is restored on node 1, the virtual host will
remain on node 2. Node 1 and node 2 are equally healthy; they both
have three up service monitors. The
NOFAILBACK policy will not
move the virtual host until a healthier server is available.