Linux

Hi,
My test server slows down at 12:00 midnight every day. I don't have any crons set. But I found that there are some system crons. Are they really important, can they cause any problem at 12 midnigh?

[root@server121 etc]# ls cron*.*
cron.deny

cron.d:
sysstat

cron.daily:
0anacron 0logwatch cups logrotate makewhatis.cron mlocate.cron prelink rpm tmpwatch

cron.hourly:
mcelog.cron

cron.monthly:
0anacron

cron.weekly:
0anacron makewhatis.cron

Red Hat Enterprise Linux ES release 4 (Nahant Update 5)
Regards,
Shantanu Oak

Usually daily jobs run at 04:00. Have you checked your cron log to see what's being run around that time?

Try running top in batch mode overnight and examine the output the following morning to figure out what's causing the slow down. See man top for the details.

Is it possible a remote backup is being run? Many of those can be scheduled by outside agents like Control M or the backup server application itself. I would try to do a netstat capture at 11:59 and again every min for 15 and tee it to a file for 15 minutes or so, then parse it to see if there are any new entries