|
|
Sponsored Content
Operating Systems
HP-UX
MC ServiceGaurd
Post 4927 by alwayslearningunix on Friday 3rd of August 2001 05:23:39 PM
08-03-2001
MC ServiceGuard is still at the forefront of HP-UX's high availability software, it has been developed to the point where (providing hardware behaves itself) it can provide 99.999% availability when spreading a service across two service guarded machines.
It's quite a sophisticated product, providing a double heartbeat between nodes to monitor machine availability in a cluster and has a whole host of cluster wide and node specific configurable parameters - HP's course covers 5 days. It works from the entry level A class server through to the top end Superdome, as well as on workstations (although the reasoning behind it's application there would be somewhat baffling).
The product does not pretend to create fault tolerant machines, I think fault tolerance in the strict sense of the word is something yet to be attained on servers, and the domain of the mainframe - but it does guarantee high availibilty and with most service level agreements providing for scheduled maintenence downtime a high availability cluster that is service guarded can provide a near fault tolerant environment by allowing services to be flipped from node to node as the sectrions of the cluster is worked on for maintenance.
It's a great product, I would recommend learning it. I am on the course next week
Regards.
It's quite a sophisticated product, providing a double heartbeat between nodes to monitor machine availability in a cluster and has a whole host of cluster wide and node specific configurable parameters - HP's course covers 5 days. It works from the entry level A class server through to the top end Superdome, as well as on workstations (although the reasoning behind it's application there would be somewhat baffling).
The product does not pretend to create fault tolerant machines, I think fault tolerance in the strict sense of the word is something yet to be attained on servers, and the domain of the mainframe - but it does guarantee high availibilty and with most service level agreements providing for scheduled maintenence downtime a high availability cluster that is service guarded can provide a near fault tolerant environment by allowing services to be flipped from node to node as the sectrions of the cluster is worked on for maintenance.
It's a great product, I would recommend learning it. I am on the course next week
Regards.
|
|
LEARN ABOUT HPUX
cm
cm(5) File Formats Manual cm(5) NAME
cm - cluster monitor for high availability clusters Remarks Cluster operations require the installation of the optional Serviceguard or Serviceguard Extension for RAC software, which is not included in the standard HP-UX operating system. DESCRIPTION
Serviceguard and Serviceguard Extension for RAC are high availability products which provide an environment such that after a failure of a node, services (applications) can be up and running again on another node within a very short amount of time. In addition, Serviceguard Extension for RAC is the enabling software for the Real Application Clusters (RAC). Working with the basic Serviceguard product, Service- guard Extension for Faster Failover allows configuration of clusters for optimized failover. Commands The following set of commands is used to configure a high availability cluster: cmquerycl(1M) cmmakepkg(1M) cmcheckconf(1M) cmapplyconf(1M) The following commands are used to run or halt a cluster: cmruncl(1M) cmhaltcl(1M) cmrunnode(1M) cmhaltnode(1M) cmviewcl(1M) Once a cluster is formed, the following commands are provided for manual operation on high availability packages: cmrunpkg(1M) cmhaltpkg(1M) cmmodpkg(1M) The following commands are used within a package control script to control the services and networks configured for a package: cmrunserv(1M) cmhaltserv(1M) cmmodnet(1M) A command is provided to aid in migrating from a SwitchOver/UX configuration to a Serviceguard cluster: cmmigrate(1M) This command is not applicable with Serviceguard Extension for RAC. SEE ALSO
Managing Serviceguard. Configuring RAC Clusters with Serviceguard Extension for RAC. Requires Optional Serviceguard Software cm(5)