Stellar Phoenix Linux Recovery

Linux Recovery When Volume Cannot Be Mounted Using Mount Command

admin — Sat, 17 Jul 2010 03:51:59 +0000

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 file 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.

Undeleting deleted files from ext2 file system in Linux

admin — Thu, 01 Jul 2010 06:40:51 +0000

Linux is one of the most used open-sourced operating systems that has carved its own niche among its faithful users. It is fast, easy-to-use, and reliable. Also, it is part of the LAMP (Linux, Apache, MySQL, PHP) stack that provides a lot of advantages to the developers and users. However, it has one drawback that it does not have a Recycle Bin like Windows systems. So, if a file is deleted you need to perform few tasks to finally recover the deleted file. However, if you are unable to recover the deleted file then you should use a third-party Linux data recovery software to perform Linux recovery.

Consider a scenario wherein you have an ext2-based Linux system. In this, you have accidentally deleted some files. Now, you want to recover the deleted files.

Resolution:

To resolve this situation, you should perform data recovery of Linux system. To do this, you should perform the following steps:

· First of all, you should determine the partition from the file was deleted. For this, you should use the pwd command in the shell console to know the working directory.

· You should unmount the current directory using the unmount command. Because of this, the original file would not be overwritten while recovering it.

· You should use the debugfs command. This command enables you to rectify the problems without causing a system crash or restart.

· You should use the isdel command. This command would enlist all the files that were deleted on the file system. Please note that this process may take some time to get completed.

· You should use the dump filename command. This command would write all the mentioned files to the current partition you are working in.

· Now, restart the system. The recovered files will be at the specified location.

However, if you still are not able to recover the deleted files, then you should use a third-party Linux data recovery software to do the needful. Such Ext2 Recovery tools are read-only in nature and are able to perform data recovery of Linux systems using fast yet sophisticated scanning algorithms.

Stellar Phoenix Linux Data Recovery is a Linux recovery software that is able to recover lost, formatted, or deleted files from various file systems such as ext2, ext3, ext4, FAT32, FAT16, and FAT12. In addition, this ext3 recovery tool is supported by various Linux distributions such as Red Hat, SUSE, Debian, Caldera, Mandrake, Sorcerer, TurboLinux, Slackware, Gentoo, etc. Also, it recovers data from various types of hard drives such as SCSI, SATA, EIDE, and IDE. This ext4 recovery tool is compatible with Windows 7, Vista, Server 2003, XP, and 2000.

Recovery of inaccessible data from corrupted ext3 file system

admin — Fri, 25 Jun 2010 09:19:20 +0000

The ext3 or third extended file system is the successor of the ext2 file system. It has got many features that corresponds to it being a reliable system from earlier versions. One of such features is the journaling feature that keeps track of all the changes that occur writing to the disk. But even after this feature, the Linux system can get corrupted and, thus, inaccessible. Such situations can happen due to various reasons such as virus infections, power outages, corrupt file system, etc. You should identify the main cause of corruption and try to resolve the issue. If you do not succeed in doing so, then you should use a third-party Linux data recovery software to perform Linux recovery.

Consider a scenario wherein you are working on your Linux based system when there is a power cut and the system shuts down abruptly. You start the system when power is restored, but it fails to boot. An error message is displayed, that is:

“ext3-fs error (device sde2): ext3_get_inode_loc: unable to read inode block - inode: 26181633, block=26181634

ls: cannot access /tmp/public/EL: Input/output error…”

Cause:

The root cause of the aforementioned error is that the ext3 file system has corrupted. It may have corrupted due to abrupt system shutdown.

Resolution:

To resolve this situation, you need to repair the corrupted file system. To do this, you should use the fsck command with the appropriate repair clause. This tool is used to check the consistency of the file system.

However, there may be times when the problem is not resolved even after performing the fsck tool. In such cases, you should reformat the hard disk and reinstall the operating system. But in that case, you may not be able to safeguard or restore your valuable data. Therefore, to recover your trapped data from the inaccessible drive you should use a third-party Linux data recovery software. Such read-only tools are extremely safe to use and perform data recovery of Linux systems without overwriting the existing data.

Stellar Phoenix Linux Data Recovery is a Linux data recoverysoftware that is used to recover lost, deleted, or formatted data from inaccessible Linux systems. It supports various Linux distributions such as Red Hat, SUSE, Debian, Caldera, Mandrake, Sorcerer, TurboLinux, Slackware, Gentoo, etc. This Ext3 file Recovery tool performs ext2 recovery and ext4 recovery as well. In addition, it supports data recovery from FAT12, FAT16, FAT32 file systems. It is compatible with Windows 7, Vista, Server 2003, XP, and 2000.

Recovering lost files from ext4 file system in Linux

admin — Mon, 21 Jun 2010 12:06:02 +0000

The ext4 file system in Linux systems is the successor of the ext3 file system. As ext3 was extensively used for quite a long period, the ext4 file system is loaded with lot of new changes to overcome the limitations of ext3 file system. Few important data structures have been added in the ext4 file system to make it provide improved performance, new features, and reliability along with a better design. One such feature is the delayed allocation feature, which does not write any new data as soon as it is entered. Because of this, the processor waits till the time it is really necessary to write the data to the disk as it optimizes the write processes.

However, sometimes the delayed allocation feature results in severe data loss. You should use appropriate methods to resolve the situation. If you are not able to restore the lost data, then you should use a third-party Linux data recovery software to perform ext4 recovery.

Consider a scenario wherein you are using Ubuntu 9.04 with ext4 file system. There is a sudden power outage and the system shuts down abruptly. When the power is restored, you find that the files that you modified just before the shut down are showing ZERO bytes size.

Cause:
The root cause of this problem is that because of the delayed allocation feature, when a file is written it is noted in the journal. But, it is not written to the disks until a gap of about 45 to 150 seconds. If you modify an existing file or create a new file, then the changes may not reflect after the power loss.

Resolution:
To resolve this absurd situation, you should download the 2.6.30 version of Linux kernel. This should be able to address the issue. However, there are chances that you may still face the same problem even after using the newer version. In such cases, you should use a third-party Linux data recovery software to restore the lost files. Such tools are read-only in nature that do not overwrite the existing data while scanning the hard disk.

Stellar Phoenix Linux Data Recovery is a Linux data recovery software that enables you to recover lost, deleted, or formatted data from inaccessible hard drives. It is able to perform data recovery of Linux systems from various hard drives such as SATA, IDE, EIDE, etc. Apart from FAT12, FAT16, and FAT32 file systems, this Linux recovery tool is capable of performing ext2 recovery, ext3 recovery, and Ext4 file Recovery. This tool supports various Linux distributions such as Red Hat, SUSE, Debian, Caldera, Mandrake, Sorcerer, TurboLinux, Slackware, Gentoo, etc. It is compatible with Windows 7, Vista, Server 2003, XP, and 2000.

Creating and Manipulating the Linux Volumes Can Cause Data Loss

admin — Wed, 16 Jun 2010 06:01:39 +0000

You can effectively manage your valuable data on Linux hard drive by dividing it into various logical disks, known as volumes. Every hard drive volume works as a different hard drive and can be used to store various kinds of data. Every volume has a file system, which can be Ext4, Ext3, Ext2, or any other Linux-supported file system. The volumes are managed in partition table, which is stored the first sector of hard drive. In case the structure or file system of a Linux volume gets damaged, it becomes totally inaccessible and you come across severe data loss. In order to get your mission-critical data recovered in such situations, Linux data recovery becomes need of hour.

Linux operating system requires at least one hard drive volume for the root file system. The swap partitions and/or swap files can be used by it, but latter are more effective. Thus, generally the user wants a dedicated swap partition. BIOS (Basic Input/Output System) can generally access only first 1024 hard drive cylinders on Intel hardware. Due to the same, various users with large hard drives generally create third volume, which has small size of few MB.

This partition is generally mounted on the /boot directory for storing kernel image and some auxiliary system files that are required at startup. The data of this volume is directory accessing to BIOS. There can be several reasons, like security, easy of backup and administration, or testing, to create more than one hard drive volumes.

You can create several hard drive partitions using fdisk command line utility in Linux operating system. It is a menu drive application or program, which is helpful to create and manipulate hard drive partition tables. This utility understands only the DOS type hard drive partition tables.

However, fdisk program can not understand GPT (GUID Partition Table) and it isn’t designed for the large volumes. In such cases, GNU parted helps you to repartition the hard drive.

Before you use the fdisk or GNU parted utility, you must backup all the data else you may face severe data loss if the process gets interrupted. In such cases, you need to perform data recovery Linux by fixing it issue.

Linux recovery is best possible using powerful and advanced third party applications, known as Linux data recovery software. They are totally safe and easy to use with read-only conduct and rich graphical user interface.

Stellar Phoenix Linux Data Recovery is the most efficient and powerful utility to ensure perfect recovery of your lost valuable data. The software works well with all major distributions of Linux operating system, including SUSE, Red Hat, Debian, and Mandriva. It recover linux data from Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file system partitions.

An Easy Way to Recover Data From Ext3 File System Volume

admin — Fri, 11 Jun 2010 08:43:04 +0000

The Ext3 (Third Extended) file system is an advanced journaling file system of Linux operating system. Ext3 is the default file system in various distributions of Linux operating system, such as Fedora, Debian, and Red Hat. It provides improved data integrity, easy translation, speed, and data availability. The file system offers in-place upgrade from popular Ext2 file system. However, in some situations, the Ext3 file system may come across various issues that can damage the file system and lead to data loss. In such critical situations, you need to go for Linux data recovery to extract lost data from Ext3 file system volume.

The Ext3 file system has added the following three major features to its predecessor Ext2 file system:

H-tree or hashed tree directory indexes for improved performance.

A file system journal to prevent data loss in case of system crash or improper system shutdown.

In-directory file types.

For better stability and availability of your Linux system, Ext3 file system has the following three levels of file system journaling-

1.Journal, where file contents and metadata are written before they are being actually committed to hard drive. It improves reliability of your system.

2.Writeback, where only the metadata is journaled. It is faster, however introduces risks of out-of-order writes.

3.Ordered, it is just like the Writeback, however the file contents are written forcedly into original file after associated metadata. It is a satisfactory compromise between performance and reliability.

In some critical situations, you may face the file system corruption and other related problems that lead to serious data loss and put you in need of data recovery Linux. The corruption to file system and its data structures is indicated by various strange error messages, similar to the following one-

“JBD: Failed to read block at offset 22327 JBD: IO error -5 recovering block 22327 in log e2fsck: Bad magic number in super-block while trying to re-open /dev/sda1 e2fsck: i/o manager magic bad!”

In such critical situations, you must have a complete and valid backup to restore data from. If backup is not available, Ext3 Recovery becomes essential. Recovery is best possible using advanced third-party applications.

The Linux data recovery software are powerful enough to carry out in-depth scan of entire hard drive and extract all lost data from it. They come equipped with interactive user interface to offer easy recovery.

Stellar Phoenix Linux Data Recovery is the best data recovery software ever made to retrieve lost data in all Linux data loss scenarios. The software recovers data from Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file system volumes. It works well with all major distributions of Linux operating system, such as Red Hat, SUSE, Debian, Fedora, and Mandriva.

Recovering data from corrupted Superblock from Linux system

admin — Tue, 08 Jun 2010 05:01:25 +0000

A Linux file system is a collection of various files and folders, which is stored in a separate disk partition. The entire disk partition is divided into various file system blocks, which are used for storing either the user data or the metadata. The metadata can be referred as the repository that contains the information of the file system. One such metadata structure is the superblock, which is very essential for the health of the Linux system. A file system cannot be mounted if you are not able to access the superblock. This case arises if the superblock is corrupted that can happen because of various reasons such as virus infections, power outages, file system corruption, human errors, etc. In such cases, you should take appropriate corrective measures to recover the file system. If you are not able to resolve the issue, then you should use a third-party Linux data recovery software to perform data recovery of Linux system.

Consider a scenario wherein you have an ext3-partitioned Linux system. When you try to access the partition, you are not able to do so. An error message is displayed, that is:

“/dev/sda2: Input/output error

mount: /dev/sda2: can’t read superblock”

Cause:

The cause of this error message is that the superblock has corrupted because of the aforementioned reasons.

Resolution:

You can restore the primary superblock from the various backup copies that the Linux system maintains for such situations. To do this, you need to perform the following steps:

Find out superblock location for /dev/sda2

Check and repair the Linux file system using alternate superblock # xyz, where xyz is the location of the alternate superblock.

Mount file system using mount command viz, # mount /dev/sda2 /mnt

Try to browse and access the file system.

However, if you still are unable to address the situation, then you should use a third-party Linux data recovery software to perform Linux recovery. Such tools are read-only in nature and perform Ext3 Recovery without overwriting the original data.

Stellar Phoenix Linux Data Recovery software is a Data Recovery for Linux software that enables you to perform Linux data recovery for various file system volumes. Apart from ext3 recovery, it is capable of performing ext2 recovery and ext4 recovery. In addition, this Linux recovery tool recovers data from various types of hard drives such as SCSI, SATA, EIDE, and IDE. It supports different Linux distributions such as Red Hat, SUSE, Debian, Caldera, Mandrake, Sorcerer, TurboLinux, Slackware, Gentoo, etc. It is compatible with Windows 7, Vista, Server 2003, XP, and Server 2000.

Interrupted Volume Conversion Process Using ‘lvconvert’ Cause Data Loss in Linux

admin — Sat, 05 Jun 2010 06:18:57 +0000

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.

Recovering lost files from an ext4-based Linux system

admin — Fri, 28 May 2010 11:46:52 +0000

The ext4 (Fourth Extended File System) is the successor of the ext3 file system, which is a journaled file system. It was developed as for backward compatible extensions to remove the 64-bit data storage limits. Being a journaled system, it is always a safe bet to use ext4-based systems in a production environment. However, at times data loss still may happen in these systems because of delayed allocation. Also, there are certain other reasons as well, such as human errors, virus infections, accidental removal of data, etc that result in data loss situations. In such cases, you should use a third-party Ext4 Recovery software to perform Linux data recovery of the lost data.

When you delete files from the ext4 file system, the files remain physically intact in the system. Only the pointer of the file system entries is deleted. Due to this, the operation system is not able to find the file at its location and, thus, this position is marked as available in the file system. To recover such deleted files, there are certain methods that you can use.

One such utility is the extundelete utility that analyzes the file system journals to recover the deleted data using ext2fs library. This utility is capable of recovering both the file name and its contents of the deleted file. Hence, it can be concluded that the extundelete utility is a useful and efficient tool.

Having said that, even the extundelete tool does not guarantee complete recovery of the lost data. Moreover, if the ext4 file system is damaged or deleted then you are unable to perform recovery of the lost data. Therefore, in such cases you should use a third-party Linux data recovery software to recover the lost, deleted, and formatted data from ext4 file system. Such read-only tools are able to recover data from all kinds of data loss using fast yet sophisticated scanning algorithms.

Stellar Phoenix Linux Data Recovery is linux data recovery software that enables you to recover lost, deleted, or formatted data from ext4 file systems. Apart from ext4 file systems, it is also capable of performing ext2 recovery and ext3 recovery. It supports various Linux distributions such as Red Hat, SUSE, Debian, Caldera, Mandrake, Sorcerer, TurboLinux, Slackware, Gentoo, etc. This Linux recovery software is able to recover data from various hard drives such as SATA, EIDE, SCSI, and IDE. It is compatible with Windows 7, Vista, Server 2003, XP, and Server 2000.

Recovering lost data in ext3 partitions after ext3grep fails to recover

admin — Thu, 27 May 2010 04:56:55 +0000

The journaled ext3 system is an extremely powerful file system and makes the data very organized as opposed to its predecessor, ext2 file system. It is so because the file system remains consistent even after a system crash or unexpected power failure. You do not need to perform lengthy checks after switching on the Linux system. Also, there is minimal chances of data fragmentation in the disk. However, in the ext3 file system there is a catch. When you delete a file, there is no prompt to delete the file. It is not even transferred to a trash bin like Windows. So, a lot of times the Linux users complain of accidental data loss. In such cases, you should use appropriate measures to recover the lost data. However, if you are not able to do so then you should use a third-party Linux data recovery software to perform ext3 recovery.

Consider a scenario wherein you are using an ext3-partitioned Linux system. While working on your system, you happen to remove some of the files. After deleting the files, you realize that you actually needed those files. You do not have the backup of these files as well. However, you need not worry as these files can be recovered. To know how’s it possible…read on

Actually once you delete a file, only its pointer is deleted from the memory and the file remains physically intact until it is overwritten by a new file. Thus, you need to immediately remount the hard drive as read-only mode.

Resolution:
In an ext3 file system, you can use ext3grep utility to retrieve deleted files from the Linux hard drive. It is a Linux utility, which is able to retrieve completely deleted files from ext3 file system volumes.
Although it is a pretty handy utility, it has got some limitations as well. It is not able to recover the files that are larger than 2 GB. In such situations, you should use a third-party Linux data recovery software to perform the recovery of the deleted files. Such read-only tools are extremely safe and do not overwrite the original content while scanning it.

Stellar Phoenix Linux Data Recovery is a Linux recovery tool that enables you to recover lost, deleted, or formatted data from Linux systems. Besides performing ext3 recovery , it is also able to perform Ext2 Recovery and ext4 recovery. It is supported by various Linux distributions such as Red Hat, SUSE, Debian, Caldera, Mandrake, Sorcerer, TurboLinux, Slackware, Gentoo, etc. It is compatible with Windows 7, Vista, Server 2003, XP, and 2000.