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On a CentOS 7 machine, I've had several instances recently where filesystems mounted manually (not using an entry in fstab) suddenly get unmounted.

This always occurs when I/O is occurring on the volumes. I've seen it happen for both physical disks and ramdisks.

In all cases, the filesystems had been mounted for at least 24 hours.

Is there a difference in the way mounts are handled by Linux systems, depending on whether they're mounted manually or from fstab?

The mount commands I used were:

sudo mount -t tmpfs -o 10G none /ramdisk
sudo mount -t xfs /dev/sda1 /Vol1
  • Have you checked logs, dmesg etc if there is any mention about a reason? – Sami Kuhmonen Feb 20 '15 at 15:20
  • Yes. I tried both "journalctl -p warning", and "journalctl | grep dev/sdX". Nothing there. – orodbhen Feb 21 '15 at 4:00

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