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      STACKER NOTE                                         STACKER NOTE
                 WINDOWS PERMANENT SWAP FILES & STACKER 4.0
                          (Applies to Stacker 4.0)
      STAC FAX  4202 (03-03-1994)
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      BACKGROUND
      
      A Windows Permanent Swap File (WPSF) must exist on an
      uncompressed portion of a hard disk because it requires
      physically contiguous space. In previous versions of Stacker this
      requirement was managed by placing the WPSF on the uncompressed
      "host" drive that also contained the STACVOL file. Stacker 4.0
      allows you increased flexibility in where you place your WPSF.
      You may still put it on the uncompressed drive, or you may
      reserve space for it on your Stacker drive.
      
      SOLUTION
      
          -Review issues concerning placement of the WPSF.
          -Setup the WPSF using the Windows Control Panel.
           
      Review issues concerning placement of the WPSF
      
      The WPSF is always an uncompressed file. Since you can place it
      on either your Stacker drive or your uncompressed drive, you
      should be aware of how this effects your disk space and space
      reporting.
      
       1.  If you place the WPSF on the uncompressed drive, there must
           be sufficient space on that drive to accept the file size
           you have selected. If there is not enough space, you will
           need to change the Stacker Drive size. See Chapter 4 of the
           Stacker User's Guide for detailed instructions. Remember,
           you will be making the Stacker Drive smaller, and
           concurrently growing uncompressed space.
       2.  If you choose to place your WPSF on the Stacker Drive,
           Stacker must reserve the amount of space that you choose for
           the file. That space must be left uncompressed, because the
           WPSF must obey its basic rule that it resides on a
           physically contiguous area of the disk. When the WPSF is
           using reserved uncompressed space on the Stacker drive, that
           space is not available to store compressed data. Creating a
           10 MB WPSF on a compressed drive leaves about 25 MB less for
           compressed data.
       3.  Stacker will take the presence of the WPSF into account
           when it reports your available disk space. The Stacker
           Toolbox in Windows reports your disk space, both used and
           free. When you select the "Details" button, the disk space
           details will be displayed. One of the program types
           displayed is "Precompressed". The WPSF is included in this
           statistic.
       4.  Do not attempt to place a WPSF on a compressed RAM drive.
           You will get an error when writing to disk.
       
       
      Setup the WPSF using the Windows Control Panel
      
      Note that the Stacker Help in Windows also describes this
      procedure.
      
       1.  Open the Windows Control Panel and select the Virtual Memory
           icon.
       2.  Select the Change button. The Virtual Memory dialog box will
           display the settings you can change.
       3.  Select the desired drive to hold the swap file.
       4.  Choose permanent as the type.
       5.  Select the New Size you desire.
       6.  Choose OK to allow Windows to make the changes, then follow
           the on-screen instructions.
      If you have a CD-ROM drive, and you have no disks in the drive,
      you may get a "drive not ready" error message when executing this
      procedure. Selecting OK or Cancel will allow you to proceed.
       
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      Copyright 1994 Stac Electronics
