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Troubleshooting the “device is busy” Error Attempting to umount a Disk

Before attempting to dismount a filesystem, it must be inactive. If “any user” has one of the filesystem’s directories as their current directory or has any file within the filesystem open, you will receive an error message, like the one below, when attempting to unmount the filesystem:

# umount /dev/dsk/c0t2d0s7
umount: /dev/dsk/c0t2d0s7: device is busy

Well, the fuser command to the rescue. The fuser command may be used to determine which files or directories within a filesystem are currently in use and to identify the processes and users that are using them.

admin July 9, 2008filesystem, fuser, linuxNo Comments

kernel linux

How Does Linux Kernel Versioning Work?

At any given time, there are several "stable" versions of Linux, and one "development" version. Unlike most proprietary software, older stable versions continue to be supported for as long as there is interest, which is why multiple versions exist. Linux version numbers follow a longstanding tradition. Each version has three…

admin July 9, 2008kernel, linux, versioningNo Comments

linux unix

Is Linux Unix?

Officially an operating system is not allowed to be called a Unix until it passes the Open Group's certification tests, and supports the necessary API's. Nobody has yet stepped forward to pay the large fees that certification involves, so we're not allowed to call it Unix. Certification really doesn't mean…

admin July 9, 2008linux, unixNo Comments

filesystem linux

Why is My Root File System Read-Only?

To understand how you got into this state, see EXT2-fs: warning: mounting unchecked file system. Remount it. If /etc/fstab is correct, you can simply type: [bash]# mount -n -o remount / [/bash] If /etc/fstab is wrong, you must give the device name and possibly the type, too: e.g. [bash]# mount…

admin July 9, 2008filesystem, linuxNo Comments