The "device is busy" solution appears when the Linux umount device is running. umountbusy

The "device is busy" solution appears when the Linux umount device is running. umountbusy

In Linux, when you use the umount command to uninstall a LV or file, umount: xxx: device is busy may occur, as shown in the following case:

[root@DB-Server u06]# vgdisplay -v VolGroup03

    Using volume group(s) on command line

    Finding volume group "VolGroup03"

  --- Volume group ---

  VG Name               VolGroup03

  System ID             

  Format                lvm2

  Metadata Areas        1

  Metadata Sequence No  2

  VG Access             read/write

  VG Status             resizable

  MAX LV                0

  Cur LV                1

  Open LV               1

  Max PV                0

  Cur PV                1

  Act PV                1

  VG Size               1.53 GB

  PE Size               32.00 MB

  Total PE              49

  Alloc PE / Size       49 / 1.53 GB

  Free  PE / Size       0 / 0   

  VG UUID               I9VS8Q-r2Gv-Ieh7-mwj2-Y8fX-4I4a-Iyg8OQ

  --- Logical volume ---

  LV Name                /dev/VolGroup03/LogVol00

  VG Name                VolGroup03

  LV UUID                2GrkGc-sA1u-GQFx-zZG3-FgPj-r7Hx-rcXKbf

  LV Write Access        read/write

  LV Status              available

  # open                 1

  LV Size                1.53 GB

  Current LE             49

  Segments               1

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     256

  Block device           253:0

  --- Physical volumes ---

  PV Name               /dev/sdc2     

  PV UUID               XrGKB6-unEt-ccor-Re6Q-ZqmG-QA5m-rutX0t

  PV Status             allocatable

  Total PE / Free PE    49 / 0

You have new mail in /var/spool/mail/root

[root@DB-Server u06]# umount /dev/VolGroup03/LogVol00

umount: /u06: device is busy

umount: /u06: device is busy

In this case, there are still processes using the/u06 mount point. At this time, you can use the fuser command to find all the processes that occupy the directory/u06, and kill it. Then you can umount lv. As follows:

[root@DB-Server u06]# fuser -m  /u06

/u06:                10584c

[root@DB-Server u06]# kill -9 10584

[root@DB-Server ~]#  umount /dev/VolGroup03/LogVol00

[root@DB-Server ~]# 

Fuser is used to display information about all processes that are using the specified file, file system, or sockets. It is usually used to diagnose the system's "resource busy" problem, usually when you want umount to specify the mount point. As shown above, use option-m to find all processes that are using the/u06 mount point. 10584c indicates that the process is 10584. for other information about fuser, you can use man fuser to view the specific information.