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Using a shared filesystem as FST backend

The EOS FST server can be configured to store data on any (shared) filesystem as storage device which supports extended attributes. To avoid that filesystems sharing a device or a shared filesystem are accounted multiple times in the space and node aggregation, one can label each filesystem with a shared filesystem name to indicated that all devices using this name share the same hardware resource.

The shared filesystem name can be configured when a filesystem is added e.g. a CephFS filesystem names cephfs1

fs add 7a41781f-62dc-4f18-8f64-375e57487578 foo.cern.ch /cephfs/ default rw cephfs1

If filesystems are already registered or the filesystem name has changed one can use the filesystem config command:

fs config 1 sharedfs=cephfs1