orangefs: document package install and xfstests procedure

Unless one is working on the userspace code, there's no need to compile
OrangeFS.  The package works just fine.

(But leave the documentation for building from source since not everyone
uses distributions which include the package.)

Also document the process to run xfstests against OrangeFS.
Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

Documentation/filesystems/orangefs.txt

@@ -42,12 +42,59 @@ Orangefs versions prior to 2.9.3 would not be compatible with the
 upstream version of the kernel client.
 
 
-BUILDING THE USERSPACE FILESYSTEM ON A SINGLE SERVER
-====================================================
+RUNNING ORANGEFS ON A SINGLE SERVER
+===================================
 
-You can omit --prefix if you don't care that things are sprinkled around in
-/usr/local. As of version 2.9.6, Orangefs uses Berkeley DB by default, we
-will probably be changing the default to lmdb soon.
+OrangeFS is usually run in large installations with multiple servers and
+clients, but a complete filesystem can be run on a single machine for
+development and testing.
+
+On Fedora, install orangefs and orangefs-server.
+
+dnf -y install orangefs orangefs-server
+
+There is an example server configuration file in
+/etc/orangefs/orangefs.conf.  Change localhost to your hostname if
+necessary.
+
+To generate a filesystem to run xfstests against, see below.
+
+There is an example client configuration file in /etc/pvfs2tab.  It is a
+single line.  Uncomment it and change the hostname if necessary.  This
+controls clients which use libpvfs2.  This does not control the
+pvfs2-client-core.
+
+Create the filesystem.
+
+pvfs2-server -f /etc/orangefs/orangefs.conf
+
+Start the server.
+
+systemctl start orangefs-server
+
+Test the server.
+
+pvfs2-ping -m /pvfsmnt
+
+Start the client.  The module must be compiled in or loaded before this
+point.
+
+systemctl start orangefs-client
+
+Mount the filesystem.
+
+mount -t pvfs2 tcp://localhost:3334/orangefs /pvfsmnt
+
+
+BUILDING ORANGEFS ON A SINGLE SERVER
+====================================
+
+Where OrangeFS cannot be installed from distribution packages, it may be
+built from source.
+
+You can omit --prefix if you don't care that things are sprinkled around
+in /usr/local.  As of version 2.9.6, OrangeFS uses Berkeley DB by
+default, we will probably be changing the default to LMDB soon.
 
 ./configure --prefix=/opt/ofs --with-db-backend=lmdb
 
@@ -55,35 +102,68 @@ make
 
 make install
 
-Create an orangefs config file:
+Create an orangefs config file.
+
 /opt/ofs/bin/pvfs2-genconfig /etc/pvfs2.conf
 
-  for "Enter hostnames", use the hostname, don't let it default to
-  localhost.
+Create an /etc/pvfs2tab file.
+
+echo tcp://localhost:3334/orangefs /pvfsmnt pvfs2 defaults,noauto 0 0 > \
+    /etc/pvfs2tab
+
+Create the mount point you specified in the tab file if needed.
+
+mkdir /pvfsmnt
 
-create a pvfs2tab file in /etc:
-cat /etc/pvfs2tab
-tcp://myhostname:3334/orangefs /mymountpoint pvfs2 defaults,noauto 0 0
+Bootstrap the server.
 
-create the mount point you specified in the tab file if needed:
-mkdir /mymountpoint
+/opt/ofs/sbin/pvfs2-server -f /etc/pvfs2.conf
 
-bootstrap the server:
-/opt/ofs/sbin/pvfs2-server /etc/pvfs2.conf -f
+Start the server.
 
-start the server:
 /opt/osf/sbin/pvfs2-server /etc/pvfs2.conf
 
-Now the server is running. At this point you might like to
-prove things are working with:
+Now the server is running.  At this point you might like to
+prove things are working with.
+
+/opt/ofs/bin/pvfs2-ls /pvfsmnt
+
+If stuff seems to be working, turn on the client core.
+
+/opt/ofs/sbin/pvfs2-client -p /opt/osf/sbin/pvfs2-client-core
+
+Mount your filesystem (load the kernel module first if necessary).
+
+mount -t pvfs2 tcp://localhost:3334/orangefs /pvfsmnt
+
+
+RUNNING XFSTESTS
+================
+
+It is useful to use a scratch filesystem with xfstests.  This can be
+done with only one server.
+
+Make a second copy of the FileSystem section in the server configuration
+file, which is /etc/orangefs/orangefs.conf.  Change the Name to scratch.
+Change the ID to something other than the ID of the first FileSystem
+section (2 is usually a good choice).
+
+Then there are two FileSystem sections: orangefs and scratch.
+
+This change should be made before creating the filesystem.
+
+pvfs2-server -f /etc/orangefs/orangefs.conf
+
+To run xfstests, create /etc/xfsqa.config.
 
-/opt/osf/bin/pvfs2-ls /mymountpoint
+TEST_DIR=/orangefs
+TEST_DEV=tcp://localhost:3334/orangefs
+SCRATCH_MNT=/scratch
+SCRATCH_DEV=tcp://localhost:3334/scratch
 
-If stuff seems to be working, turn on the client core:
-/opt/osf/sbin/pvfs2-client -p /opt/osf/sbin/pvfs2-client-core
+Then xfstests can be run
 
-Mount your filesystem.
-mount -t pvfs2 tcp://myhostname:3334/orangefs /mymountpoint
+./check -pvfs2
 
 
 OPTIONS