Reference Topics
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• How long you retain the data. A related consideration is that all backups on
a given tape or optical have the same retention level. This means that if you
have many different retention levels, you need more tapes or optical disks,
unless you use the
ALLOW_MULTIPLE_RETENTIONS_PER_MEDIA
configuration option.
• Duplicates for off-site storage or extra security.
• New software releases and other special backups.
• Replacing worn out media.
• Changes in disk usage patterns over the time period under consideration. If
your disk usage and capacity increase, your backup needs will also
probably increase.
• Number of backups that are on a tape. Because tape marks are created
between backups, a tape with many small backups (as with incrementals)
contains less real data than if it contains fewer large backups. The size of
the tape marks vary depending on the media type. A large number of
small files will also have a higher percentage of overhead in the backup
because each file requires an extra 512 bytes for catalog information on the
tape or disk.
• If you have many different volume pools, ensure that enough media is
defined in each one to accommodate the data.
Media Management Concepts
This topic discusses concepts involved in managing NetBackup media.
Volume Database
The volume datbase has information about volumes that have been configured
for use by Media Manager. As explained in the Media Manager System
Administrator’s Guide - Windows NT Server, when you add volumes they are
recorded in the volume database. On Windows NT, the volume database
resides in the install_path
\Volmgr\database
directory (the default install_path
is
C:\VERITAS
).
NetBackup 3.2 System Administrator's Guide for Windows NT
NetBackup 3.2 System Administrator's Guide for Windows NT
