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Maintaining Mirrored Systems CentreVu CMS Release 3 Version 8 Disk-Mirrored Systems
Maintaining the chkDisks crontab 40
Maintaining the chkDisks crontab 3
The chkDisks crontab runs each night and checks to see whether any
potential or actual drive problems have been logged. The results of the
search are logged to
/olds/elog
and mailed to the
root
user. This section
shows how to start and stop chkDisks, and how to verify that it will run.
Activating
chkDisks
3
Activate chkDisks by doing the following steps:
1. Enter the command:
# crontab -e
The system starts the editor and loads the
cron
file.
2. Find the line for
/olds/chkDisks.
If it is commented out, uncomment it
by deleting the pound sign at the beginning of the line. If there is no
line for
/olds/chkDisks
, add the following line to the end of the file:
15 0 * * * /olds/chkDisks > /dev/null 2>&1
Verifying chkDisks 3
To verify that
cron
is running, enter the following command:
Check the listing to see that there is an entry for chkDisks.
Changing the
scheduled run time
3
The /olds/chkDisks line in the cron file is generally in the following format:
15 0 * * * /olds/chkDisks > /dev/null 2>&1
This line tells the system to run chkDisks every day at 15 minutes past
hour zero, or 12:15 AM. You can change that schedule by changing the
first five fields as necessary. The fields, in order of appearance, are:
minute, hour, day of the month, month of the year, and day of the week.
An asterisk means “all legal values.” For more information, see the
manual (man) page for the crontab command.
Canceling
chkDisks
3
To stop cron from running, enter the following command:
With the file loaded in the editor, comment out the entry for chkDisks and
write and quit the file.
# crontab -l
# crontab -e