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Re: [Linux-cluster] Starter Cluster / GFS



Nicolas Ross wrote:

So today I dug up on Gfs2 on Redhat's site and it petty much fits my need. It seems to be a very powerfull solution. If I understand correctly, I need to setup a cluster of nodes to use Gfs. Fine with that. But since it's not a real "cluster", do I stil need the quorum to operate the global file system ? On our setup, a particular service runs on a single node from the shared filesystem.

If you want the FS mounted on all nodes at the same time then all those nodes must be a part of the cluster, and they have to be quorate (majority of nodes have to be up). You don't need a quorum block device, but it can be useful when you have only 2 nodes.

If you are only ever going to have the SAN volume mounted on one device at a time, don't bother with GFS and make the SAN block device a fail-over resource so that only one node can mount it at a time, and put a normal non-shared FS on it. You will get better performance.

The documentation on redhat's site is very technichal, but lacks some beginer's hints. For instance, there's a part about the required number of journal to create and the size of those. But I cannot find suggested size or any thumb-rule for those...

The number of journals needs to be equal to or greater than the number of nodes you have in a cluster. e.g. if you have 5 nodes in a cluster, you need at least 5 journals. If you think you might upgrade your cluster to 10 nodes at some point in the future, then create 10 journals, as this needs to be done at FS creation time.

Gordan


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