Mount shows increasing number of similar automount map entries after update to Catalina

Question

Level 1

20 points

Mount shows increasing number of similar automount map entries after update to Catalina

Longer ago i crated an automount map /etc/auto_NAS and configured it in /etc/auto_master. Purpose: Mount NAS shared automatically when accessing a specific path. Auto-mounting works well but after update to Catalina the mount command shows several similar entries of the automount map. The number of similar entries increases over time (I suppose every time the drive was auto-mounted).

Looks like the following:

/dev/disk1s5 on / (apfs, local, read-only, journaled)
devfs on /dev (devfs, local, nobrowse)
/dev/disk1s1 on /System/Volumes/Data (apfs, local, journaled, nobrowse)
/dev/disk1s4 on /private/var/vm (apfs, local, journaled, nobrowse)
map -hosts on /System/Volumes/Data/net (autofs, nosuid, automounted, nobrowse)
map auto_home on /System/Volumes/Data/home (autofs, automounted, nobrowse)
map auto_NAS on /Users/klaus/NAS (autofs, automounted, nobrowse)
map auto_NAS on /Users/klaus/NAS (autofs, automounted, nobrowse)
map auto_NAS on /Users/klaus/NAS (autofs, automounted, nobrowse)
map auto_NAS on /Users/klaus/NAS (autofs, automounted, nobrowse)
map auto_NAS on /Users/klaus/NAS (autofs, automounted, nobrowse)
map auto_NAS on /Users/klaus/NAS (autofs, automounted, nobrowse)
map auto_NAS on /Users/klaus/NAS (autofs, automounted, nobrowse)
/dev/disk1s3 on /Volumes/Recovery (apfs, local, journaled, nobrowse)
/dev/disk2s2 on /Volumes/Backup (hfs, local, nodev, nosuid, journaled)

The behavior is independent from the fs-type mounted (afp, cifs/smb).

Any idea about this behavior?

Similar experiences?

Posted on Oct 16, 2019 11:17 AM

Reply

Answer 1

Best reply

wylek

Level 1

9 points

Jan 29, 2020 11:18 AM in response to wzi

Try dexigner's suggestion from this thread (autofs in Catalina - Apple Community) and move your mount point out of your home folder (/System/Volumes/Data/Users/you/Nas) to just /System/Volumes/Data/Nas.

I've observed the same behavior with increasing duplicate maps, to the point that I'd have to restart my computer every 12 hours or so (CPU utilization increases with the number of duplicate maps). Moving my mount point seems to have finally squashed this issue.

Reply

Answer 2

JustinB-

Level 1

9 points

Nov 27, 2019 3:03 PM in response to wzi

As a work around I found commenting the entry in /etc/auto_master and running an 'automount -vc' closes these connections. Once closed uncomment the entry and run 'automount -vc' to remap your auto mounts. This avoids the need to reboot BUT I agree is not a solution to the issue.

Reply

Answer 3

Jan 29, 2020 1:25 PM in response to wylek

Thank you very much! It works!

Just one comment: I've noticed some issues with smb in Catalina (sometimes the connection breaks when copying huge files), then switched to nfs (async mode) - it seems more stable.

Reply

Answer 4

JustinB-

Level 1

9 points

Feb 1, 2020 4:15 AM in response to wylek

I previously had mounts points in the shared location '/System/Volumes/Data/Users/Shared/', i suspect moving automounts out of the 'Users/Shared' could be the key thing. I have a manual mount in the 'Users/Shared' location and it is fine.

Reply

Answer 5

wylek

Level 1

9 points

Feb 1, 2020 2:09 PM in response to JustinB-

Based on this on a few other threads, it looks like any mount point under /System/Volumes/Data/Users/ will cause an issue. I've struggled with this since Catalina was released and am really kicking myself for not trying mount points outside of Users before now!

Reply