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Chapter 4. The glusterd Service

The Red Hat Storage glusterFS daemon glusterd enables dynamic configuration changes to Red Hat Storage volumes, without needing to restart servers or remount storage volumes on clients.
Using the glusterd command line, logical storage volumes can be decoupled from physical hardware. Decoupling allows storage volumes to be grown, resized, and shrunk, without application or server downtime.
Regardless of changes made to the underlying hardware, the trusted storage pool is always available while changes to the underlying hardware are made. As storage is added to the trusted storage pool, volumes are rebalanced across the pool to accommodate the added storage capacity.

4.1. Starting and Stopping the glusterd service
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The glusterd service is started automatically on all servers in the trusted storage pool. The service can also be manually started and stopped as required.
  • Run the following command to start glusterd manually. 
    # service glusterd start
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  • Run the following command to stop glusterd manually. 
    # service glusterd stop
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When a Red Hat Storage server node hosting 256 snapshots of one or more volumes is upgraded to Red Hat Storage 3.0.4, the cluster management commands may become unresponsive. This is because, glusterd becomes unresponsive when it tries to start all the brick processes concurrently for all the bricks and corresponding snapshots hosted on the node. This issue can be observed even without snapshots, if there are an equal number of brick processes hosted on a single node.
If the issue was observed in a setup with large number of snapshots taken on one or more volumes, deactivate the snapshots before performing an upgrade. The snapshots can be activated after the upgrade is complete.
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