Руководство Пользователя для Cisco Headend System Release 2.5
749640 Rev D
Improve Backup Reliability With the bkchk Utility
3-3
Configure the bkchk Utility,
Continued
Example: The DNCS displays a message similar to the following when a backup
tape is in danger of being overwritten.
Refer to the following section, Deciding on the DAYOFFSET Parameter, for
guidance on configuring the DAYOFFSET parameter.
Deciding on the DAYOFFSET Parameter
When an entry for the bkchk utility is added to the crontab file, the system runs the
Deciding on the DAYOFFSET Parameter
When an entry for the bkchk utility is added to the crontab file, the system runs the
utility by default at 11:45 each evening, Monday through Saturday. The default
value for the DAYOFFSET parameter is 0. These default conditions are most useful
for systems that back up their DNCS database after-hours, when headend personnel
have gone home. When headend personnel return in the morning, the DNCS
displays the message noted in the preceding example. The message indicates that the
tape in the tape drive is in danger of being overwritten. Headend personnel who see
this message are therefore reminded to switch tapes in preparation for the current
day’s backup.
System operators who back up their DNCS database when headend personnel are
System operators who back up their DNCS database when headend personnel are
still on duty, may find it beneficial to set their DAYOFFSET parameter to 1.
Additionally, system operators may need to edit the bkchk.ksh entry in the crontab
file so that the system runs the utility before the scheduled database backup. This
way, if the tape in the tape drive represents the previous day’s backup, headend
personnel on duty are reminded to change the tape before it is overwritten by the
current day’s backup.
Important: Call Cisco Services if you have any questions related to the interaction of
Important: Call Cisco Services if you have any questions related to the interaction of
the crontab file and the DAYOFFSET parameter. Cisco Services engineers will
question you about when you perform your database backups and can advise you
on how to configure your crontab file entry and the DAYOFFSET parameter.
Continued on next page