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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 OPENSOLARIS
ng_device
NG_DEVICE(4) BSD Kernel Interfaces Manual NG_DEVICE(4) NAME
ng_device -- device netgraph node type SYNOPSIS
#include <netgraph/ng_device.h> DESCRIPTION
A device node is both a netgraph node and a system device interface. When a device node is created, a new device entry appears which is accessible via the regular file operators such as open(2), close(2), read(2), write(2), etc. The first node is created as /dev/ngd0, all subsequent nodes /dev/ngd1, /dev/ngd2, etc. HOOKS
A device node has a single hook with an arbitrary name. All data coming in over the hook will be presented to the device for read(2). All data coming in from the device entry by write(2) will be forwarded to the hook. CONTROL MESSAGES
The device node supports one non-generic control message: NGM_DEVICE_GET_DEVNAME Returns device name corresponding to a node. SHUTDOWN
This node shuts down upon receipt of a NGM_SHUTDOWN control message, or upon hook disconnection. The associated device entry is removed and becomes available for use by future device nodes. SEE ALSO
netgraph(4), ngctl(8) HISTORY
The device node type was first implemented in FreeBSD 5.0. AUTHORS
Mark Santcroos <marks@ripe.net> Gleb Smirnoff <glebius@FreeBSD.org> BSD October 19, 2004 BSD