Update the slurm/cray web page with respect to front-end system configuration

doc/html/cray.shtml

@@ -48,10 +48,14 @@ BATCH.</p>
 
 <h3>SLURM configuration</h3>
 
-<p>Three variables must be defined in the <i>config.h</i> file: 
+<p>Four variables must be defined in the <i>config.h</i> file: 
+<i>APBASIL_LOC</i> (location of the <i>apbasil</i> command), 
 <i>HAVE_FRONT_END</i>, <i>HAVE_CRAY_XT</i> and <i>HAVE_3D</i>.
-This can be accomplished in several different ways depending upon how 
-SLURM is being built.
+The <i>apbasil</i> command should automatically be found. 
+If that is not the case, please notify us of its location on your system
+and we will add that to the search paths tested at configure time.
+The other variable definitions can be initiated in several different 
+ways depending upon how SLURM is being built.
 <ol>
 <li>Execute the <i>configure</i> command with the option 
 <i>--enable-cray-xt</i> <b>OR</b></li>
@@ -60,6 +64,15 @@ SLURM is being built.
 <li>Add <i>%with_cray_xt 1</i> to your <i>~/.rpmmacros</i> file.</li>
 </ol></p>
 
+<p>One <i>slurmd</i> will be used to run all of the batch jobs on
+the system. It is from here that users will execute <i>aprun</i>
+commands to launch tasks.
+This is specified in the <i>slurm.conf</i> file by using the
+<i>NodeName</i> field to identify the compute nodes and both the
+<i>NodeAddr</i> and <i>NodeHostname</i> fields to identify the 
+computer when <i>slurmd</i> runs (normally some sort of front-end node)
+as seen in the examples below.</p>
+
 <p>Next you need to select from two options for the resource selection 
 plugin (the <i>SelectType</i> option in SLURM's <i>slurm.conf</i> configuration
 file):
@@ -98,7 +111,7 @@ Two examples of SLURM configuration files are shown below:</p>
 # Parameters removed here
 SelectType=select/linear
 NodeName=DEFAULT Procs=8 RealMemory=2048 State=Unknown
-NodeName=tux[000x333]
+NodeName=tux[000x333] NodeAddr=front_end NodeHostname=front_end
 PartitionName=debug Nodes=tux[000x333] Default=Yes State=UP
 </pre>
 
@@ -107,14 +120,14 @@ PartitionName=debug Nodes=tux[000x333] Default=Yes State=UP
 # Parameters removed here
 SelectType=select/linear
 NodeName=DEFAULT Procs=8 RealMemory=2048 State=Unknown
-NodeName=tux000
-NodeName=tux100
-NodeName=tux110
-NodeName=tux010
-NodeName=tux011
-NodeName=tux111
-NodeName=tux101
-NodeName=tux001
+NodeName=tux000 NodeAddr=front_end NodeHostname=front_end
+NodeName=tux100 NodeAddr=front_end NodeHostname=front_end
+NodeName=tux110 NodeAddr=front_end NodeHostname=front_end
+NodeName=tux010 NodeAddr=front_end NodeHostname=front_end
+NodeName=tux011 NodeAddr=front_end NodeHostname=front_end
+NodeName=tux111 NodeAddr=front_end NodeHostname=front_end
+NodeName=tux101 NodeAddr=front_end NodeHostname=front_end
+NodeName=tux001 NodeAddr=front_end NodeHostname=front_end
 PartitionName=debug Nodes=tux[000x111] Default=Yes State=UP
 </pre>