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 the DECram Device
    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 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

  A   DECram Configuration

  A.1     DECram Configuration Template

  A.2     Using the DECRAM$CONFIG Command Procedure

  B   DECram I/O Functions

  TABLES

  1-1        DECram Disk Versus Conventional Disk

  1-2        DECram Disk Versus Disk Caches

  3-1        Sources of Temporary Files

  B-1        DECram I/O Functions