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I am writing/reading to an SSD over NVMe. I would like to unmounts the SSD partitions and remount them after writing and before reading so as to avoid caching problems. It seems when I try to perform this operation, I get an error saying that the device is busy and it does not perform this action.

Here are the commands

/root/bin/mountfs -u sleep 5 /root/bin/mountfs -m sleep 10

Here is mountfs

#!/bin/bash # Mount/unmount ext4 file systems exit_status=1 if [ "-m" = "$1" ] then mount -t ext4 /fsmnt/fs1 mount -t ext4 /fsmnt/fs2 mount -t ext4 /fsmnt/fs3 mount -t ext4 /fsmnt/fs4 exit_status=0 elif [ "-u" = "$1" ] then umount /fsmnt/fs1 umount /fsmnt/fs2 umount /fsmnt/fs3 umount /fsmnt/fs4 exit_status=0 else echo "mountfs -m | -u" fi exit $exit_status

Is there any way in bash to programmatically wait for all reads/writes to complete, so the devices are not busy and I can successfully remount the partitions to clear NVMe Controller/OS caches?

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6
  • Maybe a filesystem type of autofs is an option? Commented Nov 20, 2017 at 15:46
  • does running sync help you immediately unmount the filesystems? Commented Nov 20, 2017 at 17:24
  • see also unix.stackexchange.com/a/28575/117549 as a possible way to keep writes synchronized Commented Nov 20, 2017 at 17:31
  • I think it may have been some fpga hardware we were testing that served as a nvme bridge. seems to work fine with the card I am using Commented Nov 20, 2017 at 19:46
  • Do you still need a solution to this, or was it bad hardware? Commented Nov 20, 2017 at 20:30

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