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

that have occurred since the last replication job are replicated from the source file system to the
target file system.
The following requirements apply to run-once replication:
• File systems specified as the replication source or target must exist.
• If a directory is specified as the replication target, the directory must exist on the target.
• When you specify a directory as the replication source, the actual replication location on the
target is created by appending the entire path of the source directory to the specified target
path. For example, if you specify the following:
replication source: <source_fs_root>dir1/dir2
replication target: <target_fs_root>dir4/dir5
The contents of <source_fs_root>dir1/dir2 is replicated to <target_fs_root>dir4/
dir5/dir1/dir2/.
• If a directory is specified as the replication source, the directory path can have multiple levels
of subdirectories and the full path must exist on the source. Using the previous example,
<source_fs_root>dir1/dir2 must exist on the source and <target_fs_root>dir4/
dir5 must exist on the target, but dir1 or dir1/dir2 does not need to exist on the target.
Remote cluster or intracluster
A replication task can use one of the following targets:
• Remote cluster. Configure either continuous or run-once replication.
• The same cluster and a different file system. Configure either continuous or run-once replication.
• The same cluster and the same file system. Configure run-once replication.
When configuring run-once replication for the same cluster and the same file system, be sure to
specify two different, non-overlapping subdirectories as the source and target. For example, the
following replication is not allowed:
From <fs_root>dir1 to <fs_root>dir1/dir2
However, the following replication is allowed:
From <fs_root>dir1 to <fs_root>dir3/dir4
Many-to-many or many-to-one replications
You can set up multiple replication tasks at once, each with a source/target replication pair. The
tasks can be many-to-many or many-to-one replications.
Many-to-many replications
In many-to-many replications, each file system on the source cluster is replicated to a different file
system on the remote target cluster. Note the following:
• Several replication tasks can run in parallel.
• Each replication is either a continuous or a run-once task.
Many-to-one replications
Many-to-one replications can be configured as follows:
• From multiple source clusters to different file systems on the same remote target cluster.
• From multiple source clusters to different subdirectories of the same target cluster and file
system.
88 Using remote replication