We are facing issue sometimes for database Filesystem disappeared

Hello Guys,

During business hours, our critical production server DB file system suddenly disappeared, this issue happens for 3rd times. Please help to check what is the root cause of this issue, let me know if you need any logs

cat /etc/redhat-release

Red Hat Enterprise Linux Server release 6.5 (Santiago)

Message from syslogd@xxxdb01 at Aug 29 09:42:36 ...

kernel:journal commit I/O error

^C

[oraprod@xxxdb01 11.2.0.3]$ df -h

Filesystem      Size  Used Avail Use% Mounted on

/dev/sda1        39G   17G   20G  46% /

tmpfs            32G   14G   19G  43% /dev/shm

/dev/sda3       9.7G  334M  8.8G   4% /home

/dev/sda6       4.9G  157M  4.5G   4% /opt

/dev/sda5       9.7G  1.4G  7.9G  15% /tmp