5.6 HP StorageWorks X9000 File Serving Software User Guide (TA768-96035, June 2011)

protocols must mount the file system from a file serving node. All requests are sent to the
mounting server, which performs the required routing.
5. A client request can be made for a file on a segment that is either owned by the server, owned
by another server but accessible by this server over the SAN, or owned by another server and
not accessible by this server over the SAN. In the second scenario, the server obtains the
relevant metadata from the owning server and performs the I/O directly over the SAN. In the
third scenario, the I/O is performed through the owning server over the IP network.
File system building blocks
A file system is created from building blocks. The first block comprises the underlying physical
volumes, which are combined in volume groups. Segments (logical volumes) are created from the
volume groups. The built-in volume manager handles all space allocation considerations involved
in file system creation.
Configuring file systems
You can configure your file systems to use the following features:
• Quotas. This feature allows you to assign quotas to individual users or groups, or to a directory
tree. Individual quotas limit the amount of storage or the number of files that a user or group
can use in a file system. Directory tree quotas limit the amount of storage and the number of
files that can be created on a file system located at a specific directory tree. See “Setting up
quotas” (page 19).
• Remote replication. This feature provides a transparent method to replicate changes in a source
file system on one cluster to a target file system on either the same cluster or a second cluster.
See “Using remote replication” (page 87).
• Snapshots. This feature allows you to capture a point-in-time copy of a file system for online
backup purposes and to simplify recovery of files from accidental deletion. The snapshot
replicates all file system entities at the time of capture and is managed exactly like any other
file system. See “Creating snapshots” (page 96).
• Data tiering. This feature allows you to set a preferred tier where newly created files will be
stored. You can then create a tiering policy to move files from initial storage, based on file
File system building blocks 9