LAMBDA DISK LAYOUTS
				 (SINGLE 515MB)

This table illustrates a range of possible disk layouts for Lambda models with
a single 515Mb disk.

The CDC-515 disk provides, after required partitions and formatting, about
438Mb.  Typical disk requirements are given first for a system "optimized" for
run-time performance, and second, where performance has been traded down for
file-system space.


		OPTIMIZED FOR	OPTIMIZED FOR
		PERFORMANCE	FILES/DEVELOPMENT

PARTIITON	SIZE(MB)	SIZE(MB)		NOTES
---------	--------	--------		-----
LAMBDA
  PAGING	123		<same>			[1]
  WORLDS	120 (4 * 30MB)	<same>			[2]
  LISP SOURCES	 30		<same>			[3]
  LISP FILES	165		<same>			[4]

LAMBDA 2X2
  PAGING	246 (2 * 123)	180 (2 * 90MB)
  WORLDS	120 (4 * 30MB)	150 (5 * 30mb)
  LISP SOURCES	 -		 30
  LISP FILES	 72		 78

LAMBDA-PLUS
  UNIX ROOT	 12		 12			[5]
  UNIX FILES	 30		 60			[6]
  UNIX PAGING	 30		 18			[7]
  PAGING	123		<same>
  WORLDS	120 (4 * 30MB)	<same>
  LISP SOURCES	 30		<same>
  LISP FILES	 93		 75

LAMBDA 2X2-PLUS
  UNIX ROOT	 12		 12
  UNIX FILES	 30		 60
  UNIX PAGING	 30		 18
  PAGING	246 (2 * 123)	180 (2 * 90MB)
  WORLDS	 90 (3 * 30MB)	 90 (3 * 30mb)
  LISP SOURCES	 -		 30
  LISP FILES	 30		 48 


[3] Gigamos provides source to most software delivered with a system.  Loading
the LISP sources is optional, but many customers prefer to have them available
for perusal of example code, learning about functionality, diagnosing
problems, etc.  Smaller amounts of space for LISP SOURCES may be required in
some instances, e.g., for using the OnLine Documentation Manager, WindowMaker,
and other optional modules.

SUMMARY
-------

On most Lambda configurations, a single disk drive will accomodate both
optimal performance requirements as well as large file systems and an adequate
number of LISP worlds.  When configuring a Lambda, care must be taken to
accomodate future expansion if, for example, applications or development
projects will require much larger file spaces.  Since a second disk-drive can
only be added to a heavy-duty chassis, the heavy-duty option should be
considered carefully.  For example, some customers have one dual-disk system
which acts as a large file server for other, single-disk Lambdas.

The single-disk Lambda 2x2-Plus is a very tight configuration which cannot
accomodate both large address space (for performance) and large file-system
space (for development ease).  The performance layout has no room for the 4th
load band most customers require for ease of system management, and no room
for the LISP sources at all.