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Re: [Linux-Cluster] Submitting two new resource plugins to the project

2009/6/2 Jonathan Brassow <jbrassow redhat com>

On Jun 1, 2009, at 2:17 PM, Rafael Micó Miranda wrote:

This can be fixed with some of the options of LVM, specifically the
"enable exclusively flag". This flag, when used over a cluster-enabled
volume, will allow the VolumeGroup to be imported by all the nodes of
the cluster but the LogicalVolumes into the VolumeGroup can only be
activated by a single node. So, only one node of your cluster will have
the LogicalVolume device (for example /dev/VolGrp01/LogVol01) and the
problem explained above cannot happen. This is not about propagating the
"open flag" through the nodes, this is about making the LogicalVolume be
in only one node.

This is different from the current approach.  We would likely take this if it is cleaner, better, or more advantageous than the current solution.

Current solution is described here:



Isn't it how it is supposed to work, the exclusive flag standing for that ?

From what I saw on other systems, especially on HP-UX from which Linux LVM was much inspired, on a cluster, when activating exclusively (vgchange -ae VGxx ) a VG on a node, the exclusive flag is set on the VG preventing the other nodes from activating the volume as long as the holding node is alive.


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