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.
glusterd service is started automatically on all servers in the trusted storage pool. The service can also be manually started and stopped as required.
When a Red Hat Gluster Storage server node that hosts a very large number of bricks or snapshots is upgraded, cluster management commands may become unresponsive as glusterd attempts to start all brick processes concurrently for all bricks and snapshots. If you have more than 250 bricks or snapshots being hosted by a single node, Red Hat recommends deactivating snapshots until upgrade is complete.