File system unmounted

I noticed oracle file system /opt/oracle got unmounted for some reason

i checked the storage and there is no issue at the storage level. no path failed.

system was up last one month.

i tried to do mount -a didn't work.

i was able to mount manually
mount /opt/oracle and it read /etc/fstab entry and mounted.

usually if there is any issue with the file system it goes to read only mode.

trying to find out why it was unmounted.
linuxpersonAsked:
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arnoldCommented:
What is the source of this file system, NFS? depending on your settings, it can run into a hard down event, but not to the point where it gets unmounted.

when not mounted does /opt/oracle have all relevant data within (i.e. not merely a mount point oracle as an empty directory?
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linuxpersonAuthor Commented:
i checked the logs, SAN logs
nothing reported what was the issue.

I am trying to write a Nagios service to watch the mount point.
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linuxpersonAuthor Commented:
No answer for this question.
i did see all the logs. Nothing shows any symptoms
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