Lucent Technologies CentreVu Call Management System Release 3 Version 8 Guide

CentreVu® Call Management System
Release 3 Version 8
Disk-Mirrored Systems
585-210-940
Comcode 108502352
Issue 1
December, 1999 

Copyright 
Ó 1999 Lucent Technologies
All Rights Reserved
Printed in U.S.A.
Notice
Every effort was made to ensure that the information in this book was 
complete and accurate at the time of printing. However, information is 
subject to change.
Your Responsibility for Your System’s Security
Toll fraud is the unauthorized use of your telecommunications system 
by an unauthorized party, for example, persons other than your com-
pany’s employees, agents, subcontractors, or persons working on your 
company’s...

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Table of Contents
Chapter 1:  Introduction to Disk Mirroring
Disk mirroring defined .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   1
Metadevices .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1
Concatenated metadevices  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   2...

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Chapter 3:  Maintaining Mirrored Systems
Using the alternate boot device   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 39
Maintaining the chkDisks crontab  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  40
Activating chkDisks .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  40
Verifying...

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Partitioning disks with the format command  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  76
How to tell whether your mirrored system is standard .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  78
Examples of valid system files .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 79
Valid vfstab files .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  ....

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  Introduction to Disk Mirroring  CentreVu CMS Release 3 Version 8 Disk-Mirrored Systems
Disk mirroring defined1
1
Introduction to Disk Mirroring1
This chapter introduces you to “disk mirroring,” an optional 
feature of CentreVuâ Call Management System (CMS) that 
provides you with a completely redundant set of data, helping 
to ensure data security. To use disk mirroring, you must have a 
Sun
* Enterprise* 3000 or Sun Enterprise 3500 platform running 
CMS r3v8.
Disk mirroring defined1
“Mirrors” are a...

  Introduction to Disk Mirroring  CentreVu CMS Release 3 Version 8 Disk-Mirrored Systems
Disk mirroring defined2
The illustration below shows a simple, two-slice metadevice.
Concatenated 
metadevices
1
A metadevice can be configured as any one of three basic types: striped, 
concatenated, 
or concatenated stripes. The type used by CMS systems 
is the concatenated metadevice. In a concatenated metadevice, data 
blocks, or 
chunks, are written sequentially across the slices, beginning 
with the first disk....

  Introduction to Disk Mirroring  CentreVu CMS Release 3 Version 8 Disk-Mirrored Systems
Disk mirroring defined3
The total capacity of this concatenated metadevice is the combined 
capacities of the three drives. If each drive is 4 gigabytes, for example, 
the metadevice has an overall capacity of 12 gigabytes.
State databases1The Solstice DiskSuite software tracks which disk partitions belong to 
which metadevices with a state database. A state database stores 
information on disk about the state of...

  Introduction to Disk Mirroring  CentreVu CMS Release 3 Version 8 Disk-Mirrored Systems
Disk mirroring defined4
Chunk 3
Chunk 4
Chunk 2 Chunk 1
Chunk 3
Chunk 4
Chunk 2 Chunk 1
Solstice DiskSuite
Metadevice d19
Metadevice d20Metadevice d21
Chunk 3
Chunk 4
Chunk 2 Chunk 1