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Volume Group activation on both nodes

 
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chindi
Respected Contributor

Volume Group activation on both nodes

Hi ,

 

Is it possible to activate same volume group on two nodes.  We have a requirement 

HPUX 11iv3 , No Service guard .

Is it safe to carry out such activity ? wont it corrupt filesystem ?

 

Do we have any third party software to do it ??

4 REPLIES
Patrick Wallek
Honored Contributor

Re: Volume Group activation on both nodes

I would not recommend this with normal LVM or VxVM.  If you activate the VG on both nodes there is a very good chance of corrupting data.

 

This is possible with a product like Oracle's Cluster File System (CFS).

http://www.oracle.com/us/technologies/linux/025995.htm

 

I do not know if Oracle CFS is available for HP-UX or not.

Bill Hassell
Honored Contributor

Re: Volume Group activation on both nodes

Sharing filesystems (and volume groups) between two or more systems guarentees corruption, usually resulting in a panic (system crash) to prevent further damage. To share filesystems requires a complex interaction between systems to coordinate updates and changes to various files, directories and metadata.

 

However, NFS handles all this quite well. You can share several filesystems with several clients.



Bill Hassell, sysadmin
chindi
Respected Contributor

Re: Volume Group activation on both nodes

Hi guys,

 

But what if NFS server fails ??

We have a requirement that same mount point will be accessed by 3 hosts simultaneously , if 1 host fails , other two hosts still must be able to work with application , its DRM solution .

 

What if its not possible with NFS too , then how do we approach this requirement ?

Bill Hassell
Honored Contributor
Solution

Re: Volume Group activation on both nodes

What you are describing is a requirement for Service Guard. Two or more nodes can be clustered together such that the critical application and/or database will always be running. An NFS server, just like any single server (or the network path to the NFS server) is indeed vulnerable. Service Guard can cluster the 3 nodes, even if they are in different cities, and through storage replication, the data will always be available to the nodes. Your requirement, although sounding simple, requires a lot of planning and extra software products to accomplish. Without clustering software and storage replication, the switchover in case of a failure will be quite chaotic.



Bill Hassell, sysadmin