11-22-2010
Umount of a "busy" disk
A product I am working on manages storage. We are currently porting it from Solaris to Linux.
The product allows its user, among other things, to add and remove file server volumes, where these volumes are exported using the NFS or the CIFS protocol.
The problem is that when the user requests to remove a volume, it is quite possible that the volume is busy, since there is a client that uses it. This is particularly a problem with CIFS volumes (exported using a Samba server).
We have considered using lazy umount, but how can I know when the umount completes and I can actually remove the volume?
Solaris has a "force" umount, which we use. It performs the umount despite any open files on the volume. Unfortunately, Linux does not support it. The "-f" flag does not work this way, and by the documentation (and my tests) only works on remote NFS volumes I mount locally.
Any thoughts on the issue will be appreciated.
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LEARN ABOUT OSF1
vgreduce
VGREDUCE(8) System Manager's Manual VGREDUCE(8)
NAME
vgreduce - reduce a volume group
SYNOPSIS
vgreduce [-a|--all] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--removemissing] [-t|--test] [-v|--verbose] VolumeGroupName [Physi-
calVolumePath...]
DESCRIPTION
vgreduce allows you to remove one or more unused physical volumes from a volume group.
OPTIONS
See lvm for common options.
-a, --all
Removes all empty physical volumes if none are given on command line.
--removemissing
Removes all missing physical volumes from the volume group, if there are no logical volumes allocated on those. This resumes normal
operation of the volume group (new logical volumes may again be created, changed and so on).
If this is not possible (there are logical volumes referencing the missing physical volumes) and you cannot or do not want to remove
them manually, you can run this option with --force to have vgreduce remove any partial LVs.
Any logical volumes and dependent snapshots that were partly on the missing disks get removed completely. This includes those parts
that lie on disks that are still present.
If your logical volumes spanned several disks including the ones that are lost, you might want to try to salvage data first by acti-
vating your logical volumes with --partial as described in lvm (8).
SEE ALSO
lvm(8), vgextend(8)
Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) VGREDUCE(8)