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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 LINUX
clinfo
clinfo(1M) System Administration Commands clinfo(1M) NAME
clinfo - display cluster information SYNOPSIS
clinfo [-nh] DESCRIPTION
The clinfo command displays cluster configuration information about the node from which the command is executed. Without arguments, clinfo returns an exit status of 0 if the node is configured and booted as part of a cluster. Otherwise, clinfo returns an exit status of 1. OPTIONS
The following options are supported: -h Displays the highest node number allowed to be configured. This is different from the maximum number of nodes supported in a given cluster. The current highest configured node number can change immediately after the command returns since new nodes can be dynam- ically added to a running cluster. For example, clinfo -h might return 64, meaning that the highest number you can use to identify a node is 64. See the Sun Cluster 3.0 System Administration Guide for a description of utilities you can use to determine the number of nodes in a cluster. -n Prints the number of the node from which clinfo is executed. EXIT STATUS
The following exit values are returned: 0 Successful completion. 1 An error occurred. This is usually because the node is not configured or booted as part of a cluster. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) SunOS 5.10 12 Mar 2002 clinfo(1M)