On 01/05/2018 12:13 AM, Angelo Moreschini wrote:
_here some line of command_ : _sudo journalctl  | grep -i PRTZ_programming_*(PRTZ_programming = name of partition I made on USB HD)**
*
Nov 12 09:29:50 localhost.pluto gnome-session[1798]: Gjs-Message: JS LOG: Unable to mount volume PRTZ_programming: Gio.IOErrorEnum: Error mounting system-managed device /dev/sdb2: Command-line `mount "/media/BKx_programming"' exited with non-zero exit status 18: Failed to write lock '/dev/sdb2': Resource temporarily unavailable Nov 12 09:29:55 localhost.pluto gnome-session[1798]: Gjs-Message: JS LOG: Unable to mount volume PRTZ_programming: Gio.IOErrorEnum: Error mounting system-managed device /dev/sdb2: Command-line `mount "/media/BKx_programming"' exited with non-zero exit status 18: Failed to write lock '/dev/sdb2': Resource temporarily unavailable

These lines are because Gnome sees a USB drive and tries to mount it, but finds out that it's being managed already.

Nov 12 09:29:57 localhost.pluto ntfs-3g[5657]: Mounted /dev/sdb2 (Read-Write, label "PRTZ_programming", NTFS 3.1) Nov 12 09:31:08 localhost.pluto ntfs-3g[5657]: Unmounting /dev/sdb2 (PRTZ_programming) Nov 12 11:02:54 localhost.pluto ntfs-3g[691]: Mounted /dev/sdb2 (Read-Write, label "PRTZ_programming", NTFS 3.1) Nov 12 19:59:58 localhost.pluto ntfs-3g[691]: Unmounting /dev/sdb2 (PRTZ_programming)

I assume the mounting time is when you run your find command. I have no idea what is unmounting it unless systemd is using something like autofs.

Nov 20 10:33:09 localhost.pluto udisksd[1506]: Mounted /dev/sdb2 at /run/media/angelo_dev/PRTZ_programming on behalf of uid 1003 Nov 20 10:33:09 localhost.pluto org.gtk.Private.UDisks2VolumeMonitor[1729]: index_parse.c:191: indx_parse(): error opening /run/media/angelo

This time it looks like udisksd got it instead of whatever else was mounting it before.

-----------------
another thing I would like to ask :
to use autofs for partitions on my USB HD that is permanently connected to computer,
it is mandatory install also NFS (network file system)  ???
-----------------

You shouldn't have to. NFS is only one thing (probably the most common one though) that is managed using autofs.
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