Technical data

Managing Storage Media
9.12 Using the Analyze/Disk_Structure Utility to Check and Repair Disks
9.12.1 Reporting Errors
By default, ANALYZE/DISK_STRUCTURE reports errors but does not make
repairs. In this mode, ANALYZE/DISK_STRUCTURE runs through eight stages
of data collection and then, by default, prints a list of all errors and lost files to
your terminal.
One type of problem that ANALYZE/DISK_STRUCTURE locates is an invalid
directory backlink. (A backlink is a pointer to the directory in which a
file resides.) If your disk has a file with an invalid directory backlink,
ANALYZE/DISK_STRUCTURE displays the following message and the file
specification to which the error applies:
%VERIFY-I-BACKLINK, incorrect directory back link [SYSEXE]SYSBOOT.EXE;1
How to Perform This Task
Enter the ANALYZE/DISK_STRUCTURE command using the following format:
ANALYZE/DISK_STRUCTURE device-name:[/qualifier]
Example
The following command reports all disk structure errors on the DUA1: device:
$ ANALYZE/DISK_STRUCTURE DUA1:
9.12.2 Reporting and Repairing Errors
To instruct ANALYZE/DISK_STRUCTURE to repair the errors that it detects,
enter the /REPAIR qualifier using the following format:
ANALYZE/DISK_STRUCTURE device-name/REPAIR
To select which errors ANALYZE/DISK_STRUCTURE repairs, enter both the
/REPAIR and /CONFIRM qualifiers using the following format:
ANALYZE/DISK_STRUCTURE device-name/REPAIR/CONFIRM
When you enter this command, ANALYZE/DISK_STRUCTURE displays a
description of each error and prompts you for confirmation before making a
repair.
Examples
1.
$ ANALYZE/DISK_STRUCTURE DUA1:/REPAIR
In this example, the command reports and repairs all errors on the DUA1:
device.
2.
$ ANALYZE/DISK_STRUCTURE DUA1:/REPAIR/CONFIRM
The command in this example might produce the following messages and
prompts:
%VERIFY-I-BACKLINK, incorrect directory back link [SYS0]SYSMAINT.DIR;1
Repair this error? (Y or N): Y
%VERIFY-I-BACKLINK, incorrect directory back link [SYSEXE]SYSBOOT.EXE;1]
Repair this error? (Y or N): N
Managing Storage Media 9–71