09-14-2009
Is umount -l dangerous?
I had a umount busy issue, that the usual fuser -mk did not solve, I did a umount -l and was able to unmount the device, I then got in trouble by the storage team staff:
Here was a snippet of their response:
Using "umount -l" is a potentially dangerous act.
The command combination for a lazy unmount "umount -l" has been outlawed in the past by the storage team.
It has caused outages on filers (they had to reboot)
I have never had the issue myself in the past with the command, and was wondering if anyone had any personal experience on this issue?
Thks.
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LEARN ABOUT DEBIAN
umount.nfs
UMOUNT.NFS(8) System Manager's Manual UMOUNT.NFS(8)
NAME
umount.nfs, umount.nfs4 - unmount a Network File System
SYNOPSIS
umount.nfs dir [-fvnrlh ]
DESCRIPTION
umount.nfs and umount.nfs4 are a part of nfs(5) utilities package, which provides NFS client functionality.
umount.nfs4 and umount.nfs are meant to be used by the umount(8) command for unmounting NFS shares. This subcommand, however, can also be
used as a standalone command with limited functionality.
dir is the directory on which the file system is mounted.
OPTIONS
-f Force unmount the file system in case of unreachable NFS system.
-v Be verbose.
-n Do not update /etc/mtab. By default, an entry is created in /etc/mtab for every mounted file system. Use this option to skip delet-
ing an entry.
-r In case unmounting fails, try to mount read-only.
-l Lazy unmount. Detach the file system from the file system hierarchy now, and cleanup all references to the file system as soon as it
is not busy anymore.
-h Print help message.
NOTE
For further information please refer nfs(5) and umount(8) manual pages.
FILES
/etc/fstab file system table
/etc/mtab table of mounted file systems
SEE ALSO
nfs(5), umount(8),
AUTHOR
Amit Gud <agud@redhat.com>
6 Jun 2006 UMOUNT.NFS(8)