Hi, All

I need somebody can help me to check what is problem caused the IO super high of my Apache.
my server crashed almost everyday. However if i use my backup to rollback for several months ago, it become fine.
The all of settings (apache2.conf and my.cnf) are the same between currently and my backup version.
When I use Iotop command to check my server, the command "apache2 -k start" cause disk read very high, and finally the server crashed.
The log listed as below. Is there anyone can help me, thanks a lot!


Total DISK READ: 141.66 M/s | Total DISK WRITE: 75.56 M/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
10874 be/4 www-data 3.67 M/s 19.30 K/s 0.00 % 74.64 % apache2 -k start
11074 ?err www-data 3.72 M/s 1520.42 B/s 0.00 % 74.38 % {no such process}
10830 be/4 www-data 4.88 M/s 2.97 K/s 12.34 % 72.50 % apache2 -k start
11079 be/4 www-data 2.31 M/s 0.00 B/s 0.70 % 67.67 % apache2 -k start
11042 be/4 www-data 1806.98 K/s 1520.42 B/s 0.00 % 67.23 % apache2 -k start
10682 be/4 www-data 3.16 M/s 1520.42 B/s 10.19 % 66.15 % apache2 -k start
10906 be/4 www-data 2.84 M/s 0.00 B/s 0.00 % 65.45 % apache2 -k start
10875 be/4 www-data 1167.04 K/s 1520.42 B/s 0.00 % 64.88 % apache2 -k start
10908 be/4 www-data 3.11 M/s 0.00 B/s 0.00 % 62.92 % apache2 -k start
10853 be/4 www-data 748.33 K/s 1520.42 B/s 0.61 % 62.60 % apache2 -k start
11003 be/4 www-data 1074.98 K/s 1520.42 B/s 0.00 % 61.98 % apache2 -k start
10869 be/4 www-data 1233.85 K/s 1520.42 B/s 0.00 % 61.53 % apache2 -k start
10858 be/4 www-data 2.28 M/s 1520.42 B/s 0.00 % 60.68 % apache2 -k start
10813 be/4 www-data 1676.32 K/s 2.97 K/s 0.56 % 59.41 % apache2 -k start
11043 be/4 www-data 1527.84 K/s 0.00 B/s 0.00 % 59.36 % apache2 -k start
10913 be/4 www-data 1057.17 K/s 2.97 K/s 0.00 % 59.03 % apache2 -k start
11080 ?err {none} 4.96 M/s 1520.42 B/s 0.28 % 58.60 % {no such process}
10922 be/4 www-data 1413.51 K/s 1520.42 B/s 0.00 % 57.36 % apache2 -k start
10847 be/4 www-data 1202.67 K/s 1520.42 B/s 3.60 % 53.95 % apache2 -k start
9375 be/4 root 5.48 M/s 0.00 B/s 0.00 % 52.21 % python /u~sbin/iotop
10876 be/4 www-data 914.63 K/s 1520.42 B/s 0.00 % 45.20 % apache2 -k start
10680 be/4 www-data 2.78 M/s 1520.42 B/s 24.03 % 44.61 % apache2 -k start