Lvm Cluster Howto
How to configure ha lvm cluster resource to share lvm in linux how to create cluster resource in ha cluster with examples 2 node cluster challenges. This howto is about how to set up a shared storage space for vm virtual disks using clustered lvm clvmd.
1 3 Running Lvm In A Cluster
In a cluster configured with clustered lvm a volume group and its logical volumes are accessible to all cluster nodes at the same time.
Lvm cluster howto. How to configure high availability lvm ie. First we will see that how to install cluster lvm on redhat linux. More than half is not possible after a failure in the 2 node cluster.
After having re added my clusternode i missed one item and that was the config parameter in etclvmlvmconf. How to install cluster lvm2 and gfs2 on redhat linux. Clvm is part of the resilient storage add on.
With fencing enabled both nodes will try to fence one another. The clustered logical volume manager clvm is a set of clustering extensions to lvm. How to configure logical volume manager for cluster file system.
October 24 2013 by lingeswaran r 7 comments. Clvmd clustered lvm daemon is a service which runs on top of regular lvm. It all just workedstarted up as wantedexpected.
Ha lvm on centos or rhel 7 linux without gfs2. Split brain can happen. To add an ha lvm resource use the pcs resource create command in conjunction with the lvm resource agent.
These extensions allow a cluster of computers to manage shared storage for example on a san using lvm. No kernel panics no nothing in regards of issues. The cluster lvm resource agent is responsible for activating deactivating and locking the volume group and its logical volumes.
Clustered lvm allows the use of regular lvm volume groups and logical volumes on shared storage. If you want to share data you should really be looking at gfs or other cluster filesystems. It still had the parameter on uselvmlockd set to 0.
High availability logical volume manager ha lvm is an add on to the already integrated lvm suite. How to install cluster lvm2 and gfs2 on redhat linux. With clustered lvm administrators can use the management benefits of lvm in conjunction with a shared file system like gfs2 for scenarios such as making virtual.
How can i configure my cluster service or resource to activate and monitor shared lvm volumes. It is using the cman ha framework for the cluster communications. Uncontrolled simultaneous access to shared storage can lead to data corruption.
After changing that rebooting it all fell into place. It enables a failover configuration for shared volumesthat is if one server in a cluster fails or is taken down for maintenance the shared storage configuration will fail over to the secondary server where all io requests will resume. The key thing to remember when sharing volumes is that all the lvm administration must be done on one node only and that all other nodes must have lvm shut down before changing anything on the admin node.
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