jbd2 causando alto disco IO

Question

Um servidor que eu comecei a ficar lento ultimamente, eu verifiquei o iostat e o disco foi quase completamente utilizado mesmo que o servidor não esteja rodando muito.

Eu verifiquei alguns lugares e agora fiquei perplexo onde procurar a seguir. Algum conselho?

iostat

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sda               0.00    65.00    0.00   58.00     0.00  1066.67    36.78     0.79   13.56    0.00   13.56  13.70  79.47
sdb               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
md0               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
md1               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
md3               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
md2               0.00     0.00    0.00  123.00     0.00  1065.33    17.32     0.00    0.00    0.00    0.00   0.00   0.00

iotop

282 be/3 root        0.00 B/s    0.00 B/s  0.00 % 90.05 % [jbd2/md2-8]
29257 be/4 rabbitmq    0.00 B/s  590.50 K/s  0.00 % 12.50 % beam.smp -W w -A 128 -P 1048576 -t 5000000 -stbt db -K true -B i -- -root /usr/lib/erlang -pr~q/mnesia/rabbit@feeds1" -kernel inet_dist_listen_min 25672 -kernel inet_dist_listen_max 25672
1184 be/4 influxdb    0.00 B/s   15.44 K/s  0.00 %  8.08 % influxd -pidfile /var/run/influxdb/influxd.pid -config /etc/influxdb/influxdb.conf
19203 be/4 root        0.00 B/s   39.35 M/s  0.00 %  0.29 % redis-rdb-bgsave 127.0.0.1:6379
 1180 be/4 influxdb    0.00 B/s   34.74 K/s  0.00 %  0.19 % influxd -pidfile /var/run/influxdb/influxd.pid -config /etc/influxdb/influxdb.conf

mdstat

root@feeds1 /home/lee # cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md2 : active raid1 sdb3[1](F) sda3[0]
  2684223488 blocks super 1.2 [2/1] [U_]
  bitmap: 19/20 pages [76KB], 65536KB chunk

md3 : active raid1 sdb4[1](F) sda4[0]
  228477376 blocks super 1.2 [2/1] [U_]
  bitmap: 2/2 pages [8KB], 65536KB chunk

md1 : active raid1 sdb2[1](F) sda2[0]
  523712 blocks super 1.2 [2/1] [U_]

md0 : active raid1 sdb1[1](F) sda1[0]
  16760832 blocks super 1.2 [2/1] [U_]

unused devices: <none>