Technical data

Managing Storage Media
9.3 Initializing Volumes
9.3.4 Assisting Users in Accessing and Initializing Volumes
Initializing volumes for users might be necessary in some circumstances:
• If the volume previously contained data, the protection code might prevent
users from accessing and initializing the volume.
• If the first file section on the volume has not reached its expiration date,
users might not be able to initialize a tape volume.
• If the volume is owned by anyone except [0,0], the user must have VOLPRO
privilege to override volume protection. If users do not have VOLPRO
privilege, they must ask the previous owner of the volume or you, as system
manager, to initialize it for them.
• If a tape is blank, the user must have VOLPRO and OPER privileges to
access and initialize it.
9.4 Protecting Volumes
Protection based on user identification codes (UICs) restricts users’ access to
volumes. By assigning access types to volumes, you determine the kinds of
actions various groups of users can perform on volumes. Section 9.4.1 and
Section 9.4.2 explain the differences between UIC-based protection for disk and
tape volumes.
For additional access control, you can set access control lists (ACLs) on volumes.
Volume ACLs are copied from the VOLUME.DEFAULT security class template.
See Section 12.6 for more information about ACLs.
Table 9–9 shows the types of access you can assign to disk and tape volumes.
Table 9–9 Access Types for Disk and Tape Volumes
Access Type Gives you the right to...
Read Examine file names, print, or copy files from the volume. System and
owner categories always have read access to tape volumes.
Write Modify or write to existing files on a volume. The protection of a file
determines whether you can perform a particular operation on the file.
To be meaningful, write access requires read access. System and owner
categories always have write access to tape volumes.
Create Create files on a disk volume and subsequently modify them. Create
access requires read and write access. This type of access is invalid for
tape volumes.
Delete Delete files on a disk volume, provided you have proper access rights at
the directory and file level. Delete access requires read access. This type
of access is invalid for tape volumes.
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