DECram for OpenVMS
User's Manual

Contents

Preface
Preface	Preface
Chapter 1
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
Chapter 2
2	DECram Disk Configuration
2.1	Preparing to Configure a DECram Disk
2.1.1	Resource Requirements
2.1.2	SYSGEN Parameters
2.2	Configuring DECram Disks
2.2.1	Creating Local and Shared DECram Disks
2.2.2	Allocating and Deallocating Space for a DECram Disk
2.2.2.1	Allocating and Deallocating Space Using INITIALIZE
2.2.2.2	Allocating and Deallocating Space Using DECram Version 3.0 or Higher
2.2.2.2.1	Special Notes for Shared Disks During Allocation and Deallocation
2.2.3	Mounting a DECram Disk
2.2.4	Mounting a Local DECram Disk
2.2.5	Mounting a Shared DECram Disk
2.3	Restoring an OpenVMS Alpha Version 7.2-1H1 (or Higher) DECram Disk
2.3.1	Restoring a Disk Using SYSMAN STARTUP
2.3.2	Restoring a Disk Using the DCL command DECRAM RECOVER
2.4	Determining Allocation of DECram Device Resources
2.4.1	Determining Resource Allocation Using DECram Version 3.0 or Higher
2.5	Shadowing a DECram Disk
2.5.1	Mounting a Shadowed DECram Disk
2.5.2	Mounting a Shadowed DECram Disk--DECram Disk to Physical Disk or Partition
2.5.2.1	Creating the DECram Disk
2.5.2.2	Mounting a Shadowed DECram Disk
Chapter 3
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	Shadow Sets of DECram Devices
3.4	DECram Limitations
3.4.1	Impact to Paging and Swapping
3.4.2	I/O Delay Characteristics Affecting DECram Use
3.4.3	Implications of Local Served and Shadowed DECram Devices
3.4.3.1	Enhanced Operation
Index
Index
Tables
1-1	DECram Disk Versus Conventional Disk
1-2	DECram Disk Versus Disk Caches
3-1	Sources of Temporary Files