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Re: SV: [Linux-cluster] Linux Clustering Newbe

Could you elaborate on the fence device.  What would suggest using ?

"Kristoffer Lippert" <kristoffer lippert jppol dk>
Sent by: linux-cluster-bounces redhat com

07/20/2007 08:13 AM

Please respond to
linux clustering <linux-cluster redhat com>

"linux clustering" <linux-cluster redhat com>
SV: [Linux-cluster] Linux Clustering Newbe

You need gfs for the changes to appear on both servers. With GFS, when one server changes a file, the other server is made aware of the changes. Also GFS takes care of file locking. Also you need a fencedevice, so the cluster can shutdown a "defective" server, and make sure it dosn't corrupt the GFS.
For your current setup:
When you have both servers running, you could mount the ext3 fs on both servers, but only the server that writes a file, will be aware of it. The other server will be aware of the new file when you remount the fs.
Hope this helps a bit.
Kind Regards

Fra: linux-cluster-bounces redhat com [mailto:linux-cluster-bounces redhat com] På vegne af Dan Askew jmsmucker com
20. juli 2007 14:01
linux clustering
[Linux-cluster] Linux Clustering Newbe

Greetings all,

I am an old veteran of HP-UX Service Guard. I am trying to get a NFS linux Cluster working and need some advise.

I have read the NFS Cookbook from Redhat and have a the following working

2 Node Linux Cluster  (RHEL AS 4.0 update 5)

one test disk LVM formated ext3 (have not decided onGFS or not)

Use Vitual IPAddress to access the disks via NFS

When SYSTEMA  runs the service and the client machine access the disk and makes changes. Then I fail over to SYSTEMB these changes made by the client are not present.

I am runing CLVMD deamon
The LVM disks are mounted on both systems

I have made the following changes to LVM.CONF

(I have tried locking_type = 2 and locking_type = 3) both have he same results. (as above)

Sorry for my ignorance but can anyone tell me what I am doing wrong...would GFS solve the syncing problem?

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