Added SELinux + DM info

Signed-off-by: Blake Devcich <blake.devcich@hpe.com>

Author: bdevcich

docs/guides/data-movement/readme.md

@@ -92,3 +92,18 @@ are on a per-request basis.
 
 See the [DataMovementCreateRequest API](copy-offload-api.html#datamovement.DataMovementCreateRequest)
 definition for what can be configured.
+
+## SELinux and Data Movement
+
+Careful consideration must be taken when enabling SELinux on compute nodes. Doing so will result in
+SELinux Extended File Attributes (xattrs) being placed on files created by applications running on
+the compute node, which may not be supported by the destination file system (e.g. Lustre).
+
+Depending on the configuration of `dcp`, there may be an attempt to copy these xattrs. You may need
+to disable this by using `dcp --xattrs none` to avoid errors. For example, the `command` in the
+`nnf-dm-config` config map or `dcpOptions` in the [DataMovementCreateRequest
+API](copy-offload-api.html#datamovement.DataMovementCreateRequest) could be used to set this
+option.
+
+See the [`dcp` documentation](https://mpifileutils.readthedocs.io/en/latest/dcp.1.html) for more
+information.