CONTENTS

  Title Page

  Copyright Page

  Preface

  1      DECram Disks
    1.1 Characteristics of a DECram Disk
      1.1.1      Comparing a DECram Disk to a Conventional Disk
      1.1.2      Comparing a DECram Disk to Disk Caches

  2      DECram Disk Configuration
    2.1 Preparing to Configure a DECram Disk
      2.1.1      Resource Requirements
    2.2 Configuring a DECram Disk
      2.2.1      Creating a DECram Disk
      2.2.2      Allocating and Deallocating Space for a DECram Disk
        2.2.2.1      Initialization Failure and Recovery
      2.2.3      Mounting a DECram Disk
    2.3 Determining DECram Device Resources
    2.4 Configuring an MSCP Served DECram Disk
      2.4.1      Creating an MSCP Served DECram Disk
      2.4.2      Allocating and Deallocating Space for an MSCP Served DECram Disk
        2.4.2.1      Initialization Failure and Recovery
      2.4.3      Mounting an MSCP Served DECram Disk
    2.5 Determining MSCP Served DECram Device Resources
    2.6 Configuring a Host-Based Shadowed DECram Disk
      2.6.1      Creating a Shadowed DECram Disk
      2.6.2      Allocating and Deallocating Space for a Shadowed DECram Disk
        2.6.2.1      Initialization Failure and Recovery
      2.6.3      Mounting a Shadowed DECram Disk
    2.7 Determining Shadowed DECram Device Resources

  3      Using a DECram Disk
    3.1 Recommended Applications for a DECram Disk
      3.1.1      Identifying Commonly Used Images
      3.1.2      Using DECram Disks with a Workstation
      3.1.3      Storing SYS$SCRATCH Files on a DECram Disk
      3.1.4      Recovering Writable DECram Files
    3.2 Using a Search List to Locate Files
    3.3 DECram Limitations
      3.3.1      Impact to Paging and Swapping
      3.3.2      I/O Delay Characteristics Affecting DECram Use
      3.3.3      Implications of MSCP Served and Shadowed DECram Devices
        3.3.3.1      Enhanced Operation
        3.3.3.2      Shadow Sets of DECram Devices

  A DECram Configurations
    A.1 DECram Configuration Template for VAX Systems (VAX Only)
    A.2 DECram Configuration Template for Alpha systems (Alpha Only)
    A.3 Using the DECRAM$CONFIG Command Procedure

  B DECram I/O Functions