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Mount FIle systems from node-1 onto node-2
Post 302907695 by rbatte1 on Tuesday 1st of July 2014 07:07:07 AM
07-01-2014
Moderator
If you want to run different applications that reference them on both servers then you are not really in a cluster any more. The service that is protected by being in a cluster with consist of resources to be available, typically disk, IP address and service processes.
These resources in a standard cluster are only available on one node at a time, and for good reason. If you have people connecting to the standby server directly, then they need to be prevented from accessing the services being protected by your cluster.
You might have an Active-Active configuration, but this is really two discreet sets of services being protected by two clusters, but using the same hardware. The only exception to this would be a true database cluster such as Oracle RAC which truly shares the disk and offers services on both sides.
If you really need to provide what you describe, you could:-You will need to stop people referring to the disk directly and get them to use the NFS mounted view.
I think that this would give you something nearer what you need. If node 1 were to fail, then the services running on node 2 would remain but you would lose the NFS disks until node 2 detected that node 1 had failed and brought up the disks and NFS to serve itself. At the same time, the business service on node 1 could be brought up on node 2 as they both rely on the NFS mounted disks. It might seem a bit odd to NFS mount to the same server, but that would mean you see the same view from either side.
An alternate would be to have the disks on a physically separate cluster just providing NFS to these two nodes.
It's a shame I don't know how to post a picture to better describe this.
Robin
These resources in a standard cluster are only available on one node at a time, and for good reason. If you have people connecting to the standby server directly, then they need to be prevented from accessing the services being protected by your cluster.
You might have an Active-Active configuration, but this is really two discreet sets of services being protected by two clusters, but using the same hardware. The only exception to this would be a true database cluster such as Oracle RAC which truly shares the disk and offers services on both sides.
If you really need to provide what you describe, you could:-
- Manage the disk as a cluster service, with it's own IP address and the NFS server included with node 1 active and node 2 standby
- Manage your 1st business service with node 1 active and node 2 standby, mounting the disk with NFS from the IP address above.
- Manage your 2nd business service with node 1 standby and node 2 active, mounting the disk with NFS from the IP address above.
I think that this would give you something nearer what you need. If node 1 were to fail, then the services running on node 2 would remain but you would lose the NFS disks until node 2 detected that node 1 had failed and brought up the disks and NFS to serve itself. At the same time, the business service on node 1 could be brought up on node 2 as they both rely on the NFS mounted disks. It might seem a bit odd to NFS mount to the same server, but that would mean you see the same view from either side.
An alternate would be to have the disks on a physically separate cluster just providing NFS to these two nodes.
It's a shame I don't know how to post a picture to better describe this.
Robin
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LEARN ABOUT HPUX
cmhaltnode
cmhaltnode(1m) cmhaltnode(1m) NAME
cmhaltnode - halt a node in a high availability cluster SYNOPSIS
cmhaltnode [-f] [-v] [-t] [node_name...] DESCRIPTION
cmhaltnode causes a node to halt its cluster daemon and remove itself from the existing cluster. To halt cluster on the node, a user must either be superuser(UID=0), or have an access policy of FULL_ADMIN allowed in the cluster configu- ration file. See access policy in cmquerycl. When cmhaltnode is run on a node, the cluster daemon is halted and, optionally, all packages that were running on that node are moved to other nodes if possible. If node_name is not specified, the cluster daemon running on the local node will be halted and removed from the existing cluster. If you issue this command while a cluster is still in the process of forming, the command will fail with the message "Unable to connect to daemon." If this happens, wait for the cluster to form successfully, then issue the command again. Options cmhaltnode supports the following options: -f Force the node to halt even if there are packages or group members running on it. The group members on the node will be terminated. The halt scripts for all packages running on the node will be run; based on priority or dependency relation- ships, this may affect packages on other nodes. In other words, packages on other nodes may either start or halt based on this package halting. If the package configuration and current cluster membership permit, and if the package halt script succeeds, the packages will be started on other nodes. Without this option, if packages are running on the given node, the command will fail. If a package fails to halt, the node halt will also fail. -v Verbose output will be displayed. -t Test only. Provide an assessment of the package placement without affecting the current state of the nodes or packages. This option validates the node's eligibility with respect to the package dependencies as well as the external dependencies such as EMS resources, package subnets, and storage before predicting any package placement decisions. If there is a pack- age in maintenance mode running on the nodes being halted, the package will always be halted and not failover to another node; the report will not display an assessment for that package. node_name... The name of the node(s) to halt. RETURN VALUE
cmhaltnode returns the following value: 0 Successful completion. 1 Command failed. EXAMPLES
Halt the cluster daemon on two other nodes: cmhaltnode node2 node3 AUTHOR
cmhaltnode was developed by HP. SEE ALSO
cmquerycl(1m), cmhaltcl(1m), cmruncl(1m), cmrunnode(1m), cmviewcl(1m), cmeval(1m). Requires Optional Serviceguard Software cmhaltnode(1m)