[jbd2/dm-0-8] usign alot of I/O

[postcd]

Hello,

i see server %wa value get high and when doing "iotop -ao" i see top process is "[jbd2/dm-0-8]" its I/O percentage is higher than any other process: 30-55%

2.6.32-042stab093.5
CentOS release 6.6 (Final)

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg-root 904G 579G 280G 68% /
tmpfs 12G 0 12G 0% /dev/shm
/dev/sda1 243M 85M 145M 37% /boot
/dev/mapper/vg-tmp 1008M 34M 924M 4% /tmp

# tune2fs -l /dev/mapper/vg-root | grep has_journal
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize

# mount -l
/dev/mapper/vg-root on / type ext4 (rw,noatime,discard)

Please any idea how to safely without reboot fix this?


PS: there is an idea and there too

 

[ryanvade]

use mounts remount option.
http://linux.die.net/man/8/mount

 

[postcd]

use mounts remount option.
http://linux.die.net/man/8/mount

thx, it is quite a production server, im afraid of any downtimes or issues that may happen as a result