The cman_tool could be used for joining the nodes to cluster, kill another cluster node, change value of the expected votes of cluster, and leave the cluster. You should be careful while using this application and must understand the consequences of commands issued through cman_tool. They might affect all the nodes in cluster. In most of the cases, this program is invoked by the shutdown and startup scripts. The cman_tool uses various subcommands, which include the following:

Join- It is the major use of the cman_tool. This utility instructs cluster manager to try to join the existing cluster or form a new cluster (if there is not existing cluster). If you do not give any option to the command, it would take cluster configuration information from Cluster Configuration System (CCS).

Kill- Tells the CMAN to kill another node in cluster. It would cause local node to send “KILL” message to the node and it would shut down. If the node had failed, recovery would occur.

Leave- Tells the CMAN to leave cluster. You can’t do it if the subsystems (like GFS and DLM) are active. You need to shutdown CLVM and dismount all the GFS

file systems before using the cman_tool leave. Before applying the force command with this option, you should create backup of all your valuable data as it might cause critical data loss situations and need Data Recovery Linux to handle it.

Linux Recovery is potential through powerful third-party applications, known as Linux Data Recovery software. They use extensive scanning techniques to thoroughly scan whole hard drive and extract all of your valuable data in most of the data loss situations. They have simple graphical user interface and thus do not need sound technical skills to retrieve data.

Stellar Phoenix Linux Data Recovery is an effective tool to ensure absolute recovery in the majority of data loss situations. It supports recovery from Ext4,Ext3, Ext2, FAT32, FAT16 and FAT12 file system volumes. The software works well with all major distributions of Linux including SUSE, Red Hat, Mandriva and Ubuntu.

This is a useful command-line tool in Linux that helps you to carry out quick and easy recovery in case of any damage to your system and data loss. This command enables you to create image of even entire Linux volume and restore it in case of any damage. On new hard drive, target partition is created having same size and structure as of the failed one. Then this utility is used for copying data from source drive.

Although, the process of this command it quite safe and easy, but a minor mistake during operation might cause disastrous situations. Performing low-level operations on hard drive, if the ‘of’ and ‘if’ parameters are get reversed accidentally. This behavior of Linux operating system renders all of your valuable data inaccessible and cause data loss. At this point, you need to perform Linux Recovery by resolving it to access your valuable data.

You much also consider the block size that has to be copied. The cont=noerror, synchronization option that is used to copy data and files, ignores remainder of block and then replaces it with zero bytes. Thus if block size is large, complete Data Recovery Linux could not be guaranteed.

In such situations, you need to methodically scan the entire hard drive using powerful and advanced scanning algorithms. This is best possible using efficient and highly automated third-party Linux Data Recovery software.

The applications come equipped with simple and self-descriptive user interface and thus let you carry out recovery on your own, without demanding sound and prior technical skills. They are built-with read-only and non-destructive conduct and thus do not alter original data on the drive.

Stellar Phoenix Linux Data Recovery is the most effective solution for all your data loss problems. The tool recovers data from all Ext4, Ext3, Ext2, FAT12, FAT16 and FAT32 hard drive volumes. It works well with all major distributions of Linux operating systems including Fedora, Red Hat, Debian, SUSE and Ubuntu.

The /etc/fstab (short form of file system table) is a significant directory of Linux operating system. This is a part of system configuration and it shows all of the available system hard disk, disk volumes and displays how they need to be integrated or initialized in Linux file system. It contains detailed description of various file systems and is generally read by the ‘fsck’ and ‘mount’ commands. Mount command determines the alternatives, which should be used when you mount any drive.

The /etc/mtab (contraction of mounted file systems table) is a Linux directory that lists all the mounted file systems on Linux system. Usually, this is in a predefined format and automatically modified when the mount command is executed to identify the current file system and how it is mounted (whether automatically or manually).

In case when these directories gets damaged, you might not access your data and need Data Recovery Linux to get your lost data back. At the time of corruption, you might encounter the below error message:

“Cannot read table of mounted file systems”

This error message cause critical situations of file and directory inaccessibility in Linux system.

Root of the problem

You might come across this behavior of Linux because of corruption to /etc/mtab or /etc/fstab directories. Due to corruption to these data structures, Linux file system can not be mounted and thus the hard drive volumes become inaccessible.

In all such cases, Linux Data Recovery come for your help. Recovery is best possible using powerful and advanced third-party Linux Recovery software. They employ advanced and effective scanning mechanisms to thoroughly scan the damaged hard drive and extract all of the lost data from it.

The tools have interactive and simple graphical user interface. Thus they do not require sound and prior technical skills to perform recovery. With read-only and non-destructive behavior, the applications are safe to use and do not change original data.

Stellar Phoenix Linux Data Recovery is the most excellent solution for most of the data loss situations. It works well with all Linux file systems including Ext4, Ext3, Ext2 and ReiserFS. The software is compatible with all major distributions of Linux operating system including SUSE, Kubuntu, Red Hat and Debian.