Technology And Computer|

There are various techniques available in order to safeguard your valuable data, and disk mirroring is the most popular among them. It is the process of create an exact replica of all the data stored on your hard drive. You can easily convert your basic hard drive volumes to mirrored volumes, which replicates your data to prevent any sort of data loss situations. On Linux operating system-based computer, you can convert your linear logical hard drive volume to the mirror logical volume using ‘lvconvert’ utility. However, you should play safely while converting a Linux volume, as interruption to the process may cause hard drive failure and data loss situations. At this point of time, you need to opt for Linux data recovery solutions to get your precious data back.

The lvconvert is an inbuilt utility of Linux operating system that enables you to change a linear Linux hard drive volume to mirror logical volume. You can also use this utility to remove or add disk logs from the mirror devices. The command line utility supports various options or parameters to perform specific task. Some of the most common parameters of this utility are as given below:

-m, –mirrors Mirrors- This option specifies degree of mirror that you want to create. For instance, ‘-m 1′ converts original Linux volume to mirror logical volume with one linear volume and one copy.

–corelog- This parameter tells the tool to switch mirror from employing a persistent (disk-based) log to in-memory log. It is possible only if –mirror argument is of same degree of mirror that you are modifying.

-R, –regionsize MirrorLogRegionSize- It divides the mirror into various regions of defined size in MB (megabyte).   

-s, –snapshot- It creates the snapshot from an existing Linux volume using another volume with same origin.

-Z, –zero y/n- This option controls zeroing of first KB of information in snapshot. The snapshot is not zeroed if volume is set to read-only.

Before you convert the volume, you must backup all your significant information. If the process fails, you can not access Linux hard drive volume and stored data and need of data recovery Linux arises. Linux recovery is best possible using advanced and powerful third-party applications. Linux data recovery applications ensure safe and easy recovery in all data loss situations, with read-only conduct and rich graphical user interface.

Stellar Phoenix Linux Data Recovery software recovers lost data from lost, deleted, corrupt, or inaccessible hard drive volumes. The software supports recovery from Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file system volumes. It works well with all major distributions of Linux operating system, including Red Hat, SUSE, Debian, Fedora, and more.

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In a Linux operating system based computer, directories, blocks, sockets, files, and other items are referred by their corresponding file descriptors. File descriptor is one of the significant data structures of Linux operating system. It is very essential for the file descriptor to be consistent for proper working of your system. In case it is damaged, you can not access your precious data from the disk and face severe data loss situations. In such cases, you need to opt for Linux data recovery solutions.

If you encounter any error from your system related to file descriptor corruption, it can be due to corruption to the Linux file system. File system corruption is a major reason of data loss and cause serious problems for you. For a practical instance of this problem with your Linux system, you may encounter the following error message when you attempt to access data from your Linux hard drive-

“Bad file descriptor”

The above error may also occur while booting your system or mounting a hard drive volume. It renders your precious data inaccessible. At this point, you need to find out the root of this problem and fix it using Linux recovery solutions.

Grounds of the problem-
You may encounter this behavior of Linux operating system due to any of the following reasons-

Linux uses /dev/null file that removes all data, which is written to the file after reporting that write process is completed successfully. You might encounter the file description problems if the file is deleted.
If this error occurs while accessing any file from the hard drive, it can be due to corrupt disk blocks or file system corruption.

Resolution
Try using the below methods to sort out this issue-
To fix overwritten or deleted /dev/null file problems, you are required to replace the file with suitable iNode.Run fsck command on the affected Linux hard drive to resolve file system inconsistency and hard drive integrity issues. Before you run this command, file system must be un-mounted and system must be running in single-user mode.

Restore data from the most recent backup. It is an efficient Ext3 recovery solution to get your precious data back.If none of the above methods work, use third-party Linux recovery software to perform data recovery Linux. The applications are capable of retrieving your significant data in all data loss situations.

In Linux operating system, root file system is a file system, which is contained on the hard drive volume on which root directory is located. Linux kernel require the root file system to be mounted on startup. All other Linux file system are mounted on root file system. In some situations, this file system gets damaged due to virus infection and improper system shutdown like situations. At this point, your system can not boot up and all your valuable data become inaccessible and you come across data loss situations. In order to get your valuable data back, Linux Data Recovery is required.

In a practical scenario, when you attempt to boot your Linux computer, you may come across below error message:

“No root file system defined. Please correct this from the partitioning menu”

Although, the error message suggests you to correct this problem from partitioning menu, but you won’t find any option on screen.

Above error message terminates the boor process and system is rebooted. The same error message occurs every time when you try to boot the system. In such cases, to extract data from Linux hard drive, you are required to identify cause of this problem and perform Data Recovery Linux by sorting it out.

Root of the problem

As stated in above error message, this issue is generally caused by corruption to the file system of Linux hard drive partition on which operating system is installed. The same issue may also occur due to corrupted or lost hard drive volume.

Root file system corruption might take place due to a number of reasons that include:

Virus contaminations

Unexpected system shutdown

Power outages

Software or application malfunction

No matter what the cause of this issue is, it is essential to resolve it to get your valuable data back. For this purpose, Linux Recovery is there for your help.

Recovery can easily and quickly be performed using third-party applications, known as Linux Data Recovery software. The tools carry out in-depth scan of entire hard drive using powerful scanning algorithms and extract all of the lost, missing and inaccessible data from Linux hard drive.

The allow you to have straightforward recovery in all cases of data loss as they have interactive and simple graphical user interface. The software do not ever alter original data due to read-only design.

Stellar Phoenix Linux Data Recovery successfully retrieves lost data in such critical data loss situations. It supports recovery from Ext4, Ext3, Ext2, FAT32, FAT16 and FAT12 file system volumes. The software can be used by all major distributions of Linux operating system including Debian, Mandriva, SUSE, Fedora and Red Hat.

The Ext4 (Fourth Extended File System) is an advanced journaling file system, developed for Linux operating system. It is successor of Ext3 file system. Ext4 has removed the 64-bit limits of Ext3 file system as it was developed as series of the backward compatible extensions. It has great stability and performance features, which make it more powerful than earlier file system of Linux operating system.

The journaling feature of Ext4 file system prevents file loss and need of Linux Data Recovery solutions, in case of system crash and unexpected system shutdown.

Under some circumstances, you may lose your valuable files from the Ext4 file system volume due to numerous reasons. The reason could be anything like-

• Accidental deletion of the important files.

• Formatting of Ext4 file system volumes unintentionally or intentionally.

• File system corruption.

• Virus infection or damage caused by other malicious programs.

In such cases, you must have an absolute backup of your valuable files. However, if the backup is not available, you face serious file loss situations and need Data Recovery Linux to work around the problem.

Recover Lost Linux Files Using Extundelete Utility

The extundelete is a command-line utility in Linux operating system, which helps you to recover lost or deleted files from Ext4 file system volumes. This utility uses the significant information stored in journal of Linux hard drive volume for retrieving the lost or deleted files. It works only on the Ext4 and Ext3 file system volumes.

This command-line tool is capable of recovering both the file names and contents of the deleted files. It is able to retrieve a deleted file just after parsing journal file. The utility is developed to perform in a fast way when you have to recover the files from large Ext4 file system volumes.

Although, extundelete utility works pretty effectively in various file loss situations, but it cannot handle situations like file system corruption and hard drive formatting. At this point, Ext4 Recovery software come for your help.

These are powerful and advanced third-party tools, which carry out in-depth scan of entire hard drive and extract all lost, missing, and inaccessible data from it. They perform quick, easy, and safe Linux Recovery in all data loss situations, with interactive user interface and read-only behavior.

Stellar Phoenix Linux Data Recovery software recovers lost Linux files from hard drive, USB drive, and network mapped volumes. It supports recovery from Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file system volumes. The software works well with all major distributions of Linux operating system, including Red Hat, SUSE, Debian, Mandriva, and Ubuntu.

All the data files that are accessible in Linux based computers are placed in a big tree, called root directory and denoted as ‘/’, in an organized form. These data files might be spread out over various devices. The mount command in Linux operating system allows you to attach a file system on a data storage media to the root directory. However, if the file system is faulty and you run fsck utility to fix the problem after mounting the disk using this command, severe file system corruption occurs. It causes critical data loss situations and calls for Linux data recovery.

The mount command tells the Linux kernel to attach the file system found on your hard drive volume in the /dir directory. The previous owner, mode, and contents of the directory become invisible after mounting, and as long as the file system stays mounted, the /dir pathname refers to the root of file system on Linux hard drive volume.

The following three types of invocations of mount command don’t actually mount the volume:

·     mount -h- It prints the help message on screen.

·     mount -V- This invocation prints the version string.

·     Mount [-l] [-t type]- The option lists all the mounted file systems that are of type “type” on your Linux hard drive. The -l option adds labels (like ext2, ext3) in the listing.

In current versions of Linux operating system, it is possible to mark the mount and submounts as private, shared, unbindable, or slave. The shared mount gives you an option to create mirrors of the mount.

Mount is an essential process for accessing data from any Linux hard drive volume. If the drive is not mountable, it cannot be accessed. Sometimes, when you try to mount a Linux volume, you come across the following error message that puts you in need of data recovery Linux:

“Wrong fs type, bad option, bad superblock on /dev/hda8, missing codepage or helper program, or other error. In some cases useful info is found in syslog – try dmesg | tail or so”

This problem is caused by dirty or corrupt file system. In such cases, you need to use Linux recovery software to get your mission-critical data back. The Linux data recovery applications enable you to thoroughly scan the affected Linux hard drive using advanced scanning algorithms.

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

Are you unable to change the ownership of your mountable Linux hard drive volumes to make them accessible on LAN? Does the process fail with both root user account and local account? Actually, this behavior occurs if you do not have appropriate permissions to change the ownership of the disk or some significant system files are damaged. Since the system files are damaged, they can not even be accessed by the regular users. This causes grave data loss situation and calls for Linux recovery, if the backup is not updated.

As a practical example of this problem, you may encounter the below error message every time you try to change the ownership of mounted hard drive on Debian Linux operating system based computer:

“debian:/# chown -v ryan:ryan /mnt/hdc1
failed to change ownership of `/mnt/hdc1′ to ryan:ryan
chown: changing ownership of `/mnt/hdc1′: Operation not permitted
debian:/# chmod -v 777 /mnt/hdc1
mode of `/mnt/hdc1′ changed to 0777 (rwxrwxrwx)
debian:/# ls -l /mnt/
total 16
drwxr-xr-x 4 root root 16384 1969-12-31 17:00 hdc1
debian:/#”

The “Operation not permitted” error may also occur if you try to mount a Linux hard drive volume, access data from a volume, move data from a location to another, or change the active partition.

Root of the problem:

This behavior may occur due to any of the below reasons and put you in need of Linux hard drive recovery alternatives:

One or more attribute bits of the directory or file are set incorrectly. It prevents you from changing disk permissions using the chmod command.

The root directory, which is repository of all sub-directories and stored data, is damaged. Thus operating system is unable to read structure of the disk.

System data structures, like file system, superblock, and iNode are either missing or corrupt. These reasons are responsible for making your Linux hard drive unusable.

Resolution:

To fix this problem, you need to repair or replace the corrupted data structures with new ones. It is possible by formatting the hard drive and reinstalling the operating system. But, this process eventually removes all your data from hard drive and causes further data loss.

In such cases, Linux hard drive recovery software come to your rescue. They are advanced commercial utilities, which thoroughly scan your hard drive using high-end scanning methods and retrieve all lost data. The Linux recovery tools are easy and safe to use.

Stellar Phoenix Linux Data Recovery software successfully recovers lost, missing, inaccessible, and deleted data from Linux hard drive. The software salvages data from Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file system volumes of all major Linux distributions like SUSE, Debian, Red Hat, and Mandriva.

In Linux operating system, you can re-size the hard drive volumes with preservation of your critical data stored on the volume, using Gparted utility. It can also be used for creating, moving and removing hard drive volumes. In some situations, resizing the hard drive volume might cause serious problems of data loss. Unsuccessful operation of disk resizing might render the disk volumes and stored data inaccessible. In these cases, you are required to opt for effective and powerful Linux Data Recovery software to get all of the missing, lost and inaccessible data. In a practical scenario, when you resize the hard drive volumes using Gparted utility in Linux, read/write operation may halt it and the hard drive might not mount.

When you try to access data from the affected hard drive, you come across a number of error messages. In such situations, if you run fsck command to detect and repair errors, it does not detect any problem and you encounter further error messages. The error message can be similar to the following one: At this point, your Linux system does not boot up and thus you can not access the stored data form hard drive. In these circumstances, you need to find out the cause of this issue and go for Data Recovery Linux to retrieve lost data.

Cause of this problem

This issue generally occurs due to corruption to the Superblock. It is one of the most critical database of your Linux operating system. The above error message indicates that your file system is severely damaged and thus the system can not work.

Resolution

The Linux operating system keeps redundant copies of superblock. You can use any of them to sort out the problem. You can search alternative superblock using ‘mkfs -n’ command. If you are unable to replace damaged superblock or the problem is with file system, you can go for hard drive formatting and operating system reinstallation. The process will replace all the damaged system resources and install a clean file system. Though above process can resolve the current problem, but it also has a drawback. Formatting the hard drive removes all of the data from it and cause critical data loss situations.

In these cases, you require Linux Data Recovery to handle the situation. Recovery is best possible using third part Linux Recovery software. The applications use high-end scanning techniques to thoroughly scan the affected drive and retrieve all of the lost, missing and inaccessible data. They are quite easy and safe to use. Stellar Phoenix Linux Data Recovery is the most excellent solution for all your Linux data loss problems. It supports recovery from Ext4, Ext3, Ext2 and ReiserFS file system volumes. The software is compatible with all major Linux distributions including RedHat, Fedora, Debian and Ubuntu.