![]() It can be used to remove entries from /etc/mtab that were unmounted earlier with the -n option. (Requires kernel 2.4.11 or later.)ĭon’t canonicalize (standardize the textual representation of) paths.Ĭauses everything to be done except for the actual system call this “fakes” unmounting the filesystem. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as soon as it is not busy anymore. Each option can be prefixed with no to specify options for which no action should be taken.įorce unmount (in case of an unreachable NFS system). More than one option type may be specified in a comma separated list. Indicate that the actions should only be taken on file systems with the specified options in /etc/fstab. The list of file system types can be prefixed with no to specify the file system types on which no action should be taken. More than one type may be specified in a comma separated list. Indicate that the actions should only be taken on file systems of the specified type. (With umount version 2.7 and later, the proc filesystem is not unmounted.) By default /sbin/umount.filesystem helper is called if one exists.Īll of the file systems described in /etc/mtab are to be unmounted. In case the unmounted device was a loop device, also free this loop device.ĭon’t call the /sbin/umount.filesystem helper even if it exists. ![]() In case unmounting fails, try to remount read-only. The offending process could even be umount itself – it opens libc, and libc in its turn may open for example locale files. ![]() Note that a file system cannot be unmounted when it is `busy’ – for example, when there are open files on it, or when some process has its working directory there, or when a swap file on it is in use. Giving the special device on which the file system lives may also work, but is obsolete, mainly because it will fail in case this device was mounted on more than one directory. A file system is specified by giving the directory where it has been mounted. The umount command detaches the file system(s) mentioned from the file hierarchy. Conversely, the umount command will detach it again. The mount command attaches a filesystem, located on some device or other, to the file tree. These files can be spread out over several devices. For example:īring the disk offline: # MegaCli64 PDoffline "physdrv" a0įor example, "physdrv" identifies disk s11, which is located in slot 10 of enclosure 20.ĭelete the disk from the controller configuration table: MegaCli64 CfgLDDel L slot a0Ĭomplete the steps in " Replacing a Disk Drive.All files accessible in Unix, or a Unix-style system such as Linux, are arranged in one big tree: the file hierarchy, rooted at /. This may help you to identify the process that is preventing the unmount. The only way to approach this is to shut down, boot to an installer disk, and then adjust the LVs (so that the tmp LV isnt actually being used, since its not mounted at /tmp, and the Kernel and such arent writing there). If the umount still fails, run lsof to list open files under the HDFS mount point and the processes that opened them. ![]() Return to your session on the server with the failed drive. If you have added any other roles that store data on the same HDFS mount point (such as HBase Region Server), then remove and restore the mount points for these roles in the same way. Remove the mount point from the NodeManager. In the Status Summary, click NodeManager.įrom the list, click to select the NodeManager that is on the host with the failed disk. In Cloudera Manager, remove the mount point from NodeManager Local Directories: Remove the mount point from the Directory field.įrom the Actions list, choose Restart this DataNode. Then click the service in the Name column, such as datanode, to open its page. In the Host column, locate the server with the failing disk. If you remove mount points in Cloudera Manager as described in the following steps, then you must restore these mount points in Cloudera Manager after finishing all other configuration procedures. ![]()
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