Compaq ProLiant CL1850 Compaq ProLiant CL1850 Software User Guide - Page 68

Managing Network Clients Connected to a Cluster, Managing a Cluster’s Shared Storage

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System Management for Microsoft Windows NT Server 4.0, Enterprise Edition 5-3 Managing Network Clients Connected to a Cluster An important aspect of managing network clients is to inform the users that their applications are now running on a cluster. Since users will experience some disruption of service, and possibly a performance degradation during failover, they might become concerned about the availability and stability of their applications. As the cluster is initially brought into a production environment, it might be beneficial to describe in a memorandum the effects a cluster will have on the users' information systems needs. When a failover or failback event occurs, the users' perspective will be only that they cannot access their application or data. When users have been properly forewarned of the effects of operating in a clustered environment, they will more readily recognize when a failover or failback event is occurring or has occurred. Most will wait several minutes before trying to reconnect to their application or data. Managing a Cluster's Shared Storage Compaq Insight Manager monitors the cluster. The physical drives and hardware are monitored via the Mass Storage Overview screen, accessed from the Device View screen. The shared logical drives (as well as other cluster resources and services) are monitored via the Cluster Management and Cluster Shared Resources screens, accessed from a cluster folder in the Device List. Because this storage system is shared, either server node could be the owner of any shared logical drive. While only one server node can own the logical drive at any given time, ownership can switch from one server node to another. Compaq Insight Manager reports the current owner of a logical drive and updates this information dynamically if a failover occurs. NOTE: Compaq Insight Manager shows the shared logical drives as cluster resources owned by a particular server node. It shows the cluster hardware as a physical resource of both servers in the cluster. When viewing the Compaq Insight Manager Cluster Shared Resources screen, you can determine which logical drive contains a particular drive by looking at the Physical ID field under the Shared Resources heading.

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System Management for Microsoft Windows NT Server 4.0, Enterprise Edition
5-3
Managing Network Clients Connected to a Cluster
An important aspect of managing network clients is to inform the users that
their applications are now running on a cluster. Since users will experience
some disruption of service, and possibly a performance degradation during
failover, they might become concerned about the availability and stability of
their applications. As the cluster is initially brought into a production
environment, it might be beneficial to describe in a memorandum the effects a
cluster will have on the users’ information systems needs.
When a failover or failback event occurs, the users’ perspective will be only
that they cannot access their application or data. When users have been
properly forewarned of the effects of operating in a clustered environment,
they will more readily recognize when a failover or failback event is occurring
or has occurred. Most will wait several minutes before trying to reconnect to
their application or data.
Managing a Cluster’s Shared Storage
Compaq Insight Manager monitors the cluster. The physical drives and
hardware are monitored via the Mass Storage Overview screen, accessed from
the Device View screen.
The shared logical drives (as well as other cluster resources and services) are
monitored via the Cluster Management and Cluster Shared Resources screens,
accessed from a cluster folder in the Device List.
Because this storage system is shared, either server node could be the owner of
any shared logical drive. While only one server node can own the logical drive
at any given time, ownership can switch from one server node to another.
Compaq Insight Manager reports the current owner of a logical drive and
updates this information dynamically if a failover occurs.
NOTE:
Compaq Insight Manager shows the shared logical drives as cluster resources
owned by a particular server node. It shows the cluster hardware as a physical resource
of both servers in the cluster.
When viewing the Compaq Insight Manager Cluster Shared Resources screen,
you can determine which logical drive contains a particular drive by looking at
the Physical ID field under the Shared Resources heading.