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diff --git a/extras/specgen.scm b/extras/specgen.scm
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+#!/usr/bin/guile -s
+!#
+
+;;; Copyright (C) 2007 Z RESEARCH Inc. <http://www.zresearch.com>
+;;;  
+;;; This program is free software; you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 2 of the License, or
+;;; (at your option) any later version.
+;;;  
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;  
+;;; You should have received a copy of the GNU General Public License
+;;; along with this program; if not, write to the Free Software
+;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+;;;  
+
+;;; This script lets you specify the xlator graph as a Scheme list
+;;; and provides a function to generate the spec file for the graph.
+
+
+(define (volume args)
+  (apply
+   (lambda (name type options)
+     (lambda args
+       (display "volume ") (display name) (newline)
+       (display "  type ") (display type) (newline)
+       (map (lambda (key-value-cons)
+	      (let ((key (car key-value-cons))
+		    (value (cdr key-value-cons)))
+		(display "  option ") (display key) (display " ")
+		(display value) (newline)))
+	    options)
+       (if (> (length args) 0)
+	   (begin
+	     (display "  subvolumes ")
+	     (map (lambda (subvol)
+		    (display subvol) (display " "))
+		  args)
+	     (newline)))
+       (display "end-volume") (newline) (newline)
+       name))
+   args))
+
+;; define volumes with names/type/options and bind to a symbol
+;; relate them seperately (see below)
+;; more convinient to seperate volume definition and relation
+
+(define wb (volume '(wb0
+		     performance/write-behind
+		     ((aggregate-size . 0)
+		      (flush-behind . off)
+		      ))))
+
+(define ra (volume '(ra0
+		     performance/read-ahead
+		     ((page-size . 128KB)
+		      (page-count . 1)
+		      ))))
+
+(define ioc (volume '(ioc0
+		      performance/io-cache
+		      ((page-size . 128KB)
+		       (cache-size . 64MB)
+		      ))))
+
+(define iot (volume '(iot0
+		      performance/io-threads
+		      ()
+		      )))
+
+(define client1 (volume '(client1
+			  protocol/client
+			  ((transport-type . tcp/client)
+			   (remote-host . localhost)
+			   (remote-subvolume . brick1)
+			   ))))
+
+(define client2 (volume '(client2
+			  protocol/client
+			  ((transport-type . tcp/client)
+			   (remote-host . localhost)
+			   (remote-subvolume . brick2)
+			   ))))
+
+(define unify (volume '(unify0
+			cluster/unify
+			((scheduler . rr)
+			 ))))
+
+;; relate the symbols to output a spec file
+;; note: relating with symbols lets you change volume name in one place
+
+(wb (ra (ioc (iot (unify (client1)
+			 (client2))))))