The third extended file system "ext3 file system "is an extremely powerful file system that arranges the data in a well organized fashion and much better than its predecessor, second extended file system "ext2 file system". That's because the ext3 file system remains consistent even after system crash or unexpected power failure.
Lengthy checks after switching on the Linux system are not required to check file system integrity. Also, Data fragmentation in the disk is properly checked. However in Ext3 file system When you delete a file It is not transferred to a trash bin this increases the chance of accidential data loss and you have to use appropriate measures to recover the lost linux data. If that does not happen then a third-party Linux recovery software is required to perform ext3 recovery.
Once you delete a file, only its pointer is deleted from the memory not the file and the file remains physically present there unless it is overwritten by some another file.
Resolution:
In an ext3 file system, ext3grep utility is used to recover deleted files from the Linux hard disk. eventhough it is quiet handy utility, there are some limitations associalted with it like fails to recover the files larger than 2 GB. In such conditions, a third-party Linux recovery software is required to perform the recovery of the deleted files. Such read-only tools are extremely efficient they recover most of the deleted file.
Thursday, May 27, 2010
Tuesday, May 25, 2010
Linux data recovery after hard drive crash
Crashing of Linux hard disk abruptly every time the system is started is a cause of worry it renders our important data inaccessible Well, the problem may occur due to many reasons like power failure,improper shutdown, virus attack and the most common reason is the missing or corrupt data structures of your Linux hard disk. Due to this reason, OS fails to locate stored files on the hard disk and access them. At this point, you need to opt for Data Recovery Linux solutions to get your valuable data back.
Crash of a Linux hard disk is indicated by the following symptoms.
1) Your Linux based computer fails to boot up.
2) Various error messages, such as “No Fixed Disk Present” or “DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER” are displayed
3) Blank screen after you boot your system.
4) Frequent System reboots and freezes.
5) “OS not found” and “Disk not formatted” messages.
When System crash happens, it becomes impossible for the OS to locate files on hard disk and the boot process fails If it cannot locate and access the required files, In order to fix problem, you are required to format the system and reinstall operating system but this process replaces all the missing, corrupt or damaged system resources. However, it also removes all the data from hard disk and create needs of Linux recovery software to recover all the data from your hard disk.
Crash of a Linux hard disk is indicated by the following symptoms.
1) Your Linux based computer fails to boot up.
2) Various error messages, such as “No Fixed Disk Present” or “DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER” are displayed
3) Blank screen after you boot your system.
4) Frequent System reboots and freezes.
5) “OS not found” and “Disk not formatted” messages.
When System crash happens, it becomes impossible for the OS to locate files on hard disk and the boot process fails If it cannot locate and access the required files, In order to fix problem, you are required to format the system and reinstall operating system but this process replaces all the missing, corrupt or damaged system resources. However, it also removes all the data from hard disk and create needs of Linux recovery software to recover all the data from your hard disk.
Monday, May 24, 2010
Linux recovery after data loss due to Logical volume extending Error
Logical Volume Manager is a part of Linux OS kernel, which manages hard disk and other mass storage devices. It is a way of allocating drive space into various Logical Volumes (L V ) , which can easily be extended or resized instead of doing this with hard disk partitions.
You can easily extend a LV, using lvextend utility. It also supports extension of the snapshot LV. Absolute back up is to be created first before proceeding towards extending a Linux LV. In case the logical volume extending process gets interrupted, you may lose access to logical volumes and encounter data loss. At this point, you have to opt for Linux data recovery software to get your valuable data back.
The lvextend command-line utility, offers you the following options to perform a series of operations on your logical volume-
1) -l, –extents [+]LogicalExtentsNumber[%{VG|LV|FREE}]: It sets or extends the size of LV in units of the logical extents. With + sign, value is contributed to actual size of volume and without this, value is accepted as absolute one.
2) -L, –size [+]LogicalVolumeSize[kKmMgGtTpPeE]: Sets or extends size of LV in the units of MB.
3) -i, –stripes Stripes: Provides number of the stripes for extension. This option is not usable with the LV, which use original metadata LVM format that must use single value throughout.
4) -I, –stripesize StripeSize: Provides number of the kb for granularity of stripes. It does not work on LV, which use original meta data LVM format that must use single value throughout.
All the above options are very useful in modifying a logical volume. However, serious problems occur if the process is interrupted due to any reasons, such as system crash, improper system shutdown,power outages and user error. In such cases, the volume can not be accessed and you encounter severe data loss, which require Linux recovery Software to be fixed.
Data Recovery Linux is best possible using advanced and efficient Linux recovery software. They recover lost data safely and easily in all data loss situations.
You can easily extend a LV, using lvextend utility. It also supports extension of the snapshot LV. Absolute back up is to be created first before proceeding towards extending a Linux LV. In case the logical volume extending process gets interrupted, you may lose access to logical volumes and encounter data loss. At this point, you have to opt for Linux data recovery software to get your valuable data back.
The lvextend command-line utility, offers you the following options to perform a series of operations on your logical volume-
1) -l, –extents [+]LogicalExtentsNumber[%{VG|LV|FREE}]: It sets or extends the size of LV in units of the logical extents. With + sign, value is contributed to actual size of volume and without this, value is accepted as absolute one.
2) -L, –size [+]LogicalVolumeSize[kKmMgGtTpPeE]: Sets or extends size of LV in the units of MB.
3) -i, –stripes Stripes: Provides number of the stripes for extension. This option is not usable with the LV, which use original metadata LVM format that must use single value throughout.
4) -I, –stripesize StripeSize: Provides number of the kb for granularity of stripes. It does not work on LV, which use original meta data LVM format that must use single value throughout.
All the above options are very useful in modifying a logical volume. However, serious problems occur if the process is interrupted due to any reasons, such as system crash, improper system shutdown,power outages and user error. In such cases, the volume can not be accessed and you encounter severe data loss, which require Linux recovery Software to be fixed.
Data Recovery Linux is best possible using advanced and efficient Linux recovery software. They recover lost data safely and easily in all data loss situations.
Sunday, May 23, 2010
How to Resolve Error "Journal Inode is Deleted"
A Linux OSX based system becomes unbootable in case its file system gets damaged or corrupted or In most of these situations, a Linux user fails to access the data saved on the Linux hard disk. Few causes for corruption in file system (either EXT2,EXT3,or EXT4 ) can be improper system shutdown,virus infection,inode corruption, superblock damage, accidental system shutdown as well as OS malfunction.
To overcome these situations, the user needs to repair the damaged file system with the help of 'e2fsck' command. This command checks and repairs the corrupted files in almost all cases. However, the command does not ensure 100% repair in all file system corruption scenarios. For cases where the above command fails, the user needs to reinstall Linux OS and then restore data from an updated backup. But, in the absence of the updated backup, you will need to opt for a commercial Linux data Recovery application.
To illustrate the above situation, consider a practical scenario where you encounter the below error message while trying to boot your Linux system:
"ext2fs partition type 0x83..... ext3-fs: journal inode is deleted....mount: error 22 mounting ext3 error 2 mounting name switchroot: mountfailed:22 umount/initrd/dev failed:2 kernal panic - not syncing."
Once the above error message flashes on your screen, the system becomes unbootable, further resulting in inaccessibility of hard disk data.
Cause:
The above error message appears when the files gets damaged or corrupted .
Resolution:
Follow the below guidelines to resolve the above error message:
1. Run 'e2fsck' command to repair the corrupted file system.
2. In case, the above command fails to repair the file system, follow the below steps:
Reinstall the Linux OS.
Restore the data from an updated backup.
For cases where there is no backup available, use a third-party Linux Recovery software.
A data recovery Linux utility is a powerful tool that is specifically designed to recover Linux data post clean reinstall of Linux OS. Such tools are very easily understandable and do not require any technical know how.
To illustrate the above situation, consider a practical scenario where you encounter the below error message while trying to boot your Linux system:
"ext2fs partition type 0x83..... ext3-fs: journal inode is deleted....mount: error 22 mounting ext3 error 2 mounting name switchroot: mountfailed:22 umount/initrd/dev failed:2 kernal panic - not syncing."
Once the above error message flashes on your screen, the system becomes unbootable, further resulting in inaccessibility of hard disk data.
Cause:
The above error message appears when the files gets damaged or corrupted .
Resolution:
Follow the below guidelines to resolve the above error message:
1. Run 'e2fsck' command to repair the corrupted file system.
2. In case, the above command fails to repair the file system, follow the below steps:
Reinstall the Linux OS.
Restore the data from an updated backup.
For cases where there is no backup available, use a third-party Linux Recovery software.
A data recovery Linux utility is a powerful tool that is specifically designed to recover Linux data post clean reinstall of Linux OS. Such tools are very easily understandable and do not require any technical know how.
Wednesday, May 19, 2010
Linux corruption due to Resizing mounted Ext2 file system
The second extended file system, popularly known as Ext2 file system is an advanced file system for Linux Operating system. It is possible to resize the Ext2 file system, while it is currently in use . Ext2 online utility has made this possible. you should always have a complete and updated backup of your important data before mounting the file system .if anything goes wrong, you may face serious data loss situations, which requires Linux recovery software to be fixed.Only the mounted Ext2 file system can be resized. In order to use the ext2online utility, you must have Online support to resize ext2 (CONFIG_EXT2_RESIZE) option enabled in your Linux Kernel. This feature can used after applying appropriate patch for 2.x kernel series.
The file system, as specified by the device, or the mount point must be mounted currently. By default, the size of the mounted file system is enlarged to fill up the device. If an optional size parameter is specified, then it uses the specified size instead. in case it is not available, it is taken from Ext2 file system blocks.
The ext2online utility changes the file system only. When you want to enlarge file system, you should expand underlying storage device first. You can do it , using the lvextend tool that combines file system resizing and LV extensions.
The original algorithm of Ext2 file system doesn’t provide online resizing option. There are some restrictions to the amount of resizing, that you can do while your file system is mounted.
You should always keep in mind that resizing the mounted file system is not an 100 percent safe option its quiet risky and causes file system corruption. At this point, Linux data recovery becomes essential.
Monday, May 10, 2010
Ext2 recovery: Recovering lost data from ext2 Linux system
The Linux system is an open sourced OS that is used by people all over the world. Unlike Windows and Apple operating systems, it is not a sole proprietary of a single organization. In fact, over 1,000 developers from at least 100 different companies have contributed to its each update.
The most notable thing about Linux is that it can be used absolutely anywhere, from wristwatches to supercomputers. However, Linux systems too can get corrupted. Corruption can occur due to various reasons such as human errors, virus infections, abrupt system shutdown, damaged file system, faulty hardware components, etc. To resolve this issue, you should take appropriate corrective measures. However, if you are unable to do so then you should use a third-party Linux data recovery software to perform Ext2 File recovery of Linux system.
Consider a scenario wherein you are not able to boot your Linux-based system having ext2 file system.
Cause of the Error :
It may be possible that the file system of your Linux system has corrupted and, thus, has become inaccessible. There could be following reasons for this behavior:
1)Virus infections
2) Bad sectors
3) Corruption in the Inode table, group descriptor, or super block
How to resolve:
To resolve this error message, you should perform either of the following methods:
Use the e2fsck command to check for errors in file system and repair damaged Linux file system.
If e2fsck is not able to resolve the issue, then format the system and reinstall Linux.
Formatting the system and reinstalling Linux would solve the problem. But then, you would lose all the valuable data. In such cases, you should use a third-party Linux data recovery software to perform Linux recovery. Such read-only tools perform Linux recovery using fast yet sophisticated scanning algorithms. These tools have a highly interactive user interface that enables you to perform Linux data recovery very easily.
Cause of the Error :
It may be possible that the file system of your Linux system has corrupted and, thus, has become inaccessible. There could be following reasons for this behavior:
1)Virus infections
2) Bad sectors
3) Corruption in the Inode table, group descriptor, or super block
How to resolve:
To resolve this error message, you should perform either of the following methods:
Use the e2fsck command to check for errors in file system and repair damaged Linux file system.
If e2fsck is not able to resolve the issue, then format the system and reinstall Linux.
Formatting the system and reinstalling Linux would solve the problem. But then, you would lose all the valuable data. In such cases, you should use a third-party Linux data recovery software to perform Linux recovery. Such read-only tools perform Linux recovery using fast yet sophisticated scanning algorithms. These tools have a highly interactive user interface that enables you to perform Linux data recovery very easily.
Wednesday, May 5, 2010
Recovering ext3-based Linux system in case of superblock corruption
The ext3 file system of Linux operating system is the successor of ext2, and is a journaled file system. Being a journaled system, it keeps track of all the changes that happen to the system before committing it to the main file system. The ext3 file system is also considered to be relatively simpler than other file systems. However, sometimes the ext3 system becomes corrupt and, inaccessible due to various reasons, including human errors, virus infections, power outages, abrupt system shutdown, etc. In such situations, you need to take appropriate corrective measures. However, if you are unable to resolve the issue then you should consider using a third-party Linux data recovery software to perform ext3 recovery.
Consider a scenario wherein you are not able to boot your ext3-based Linux system.
Cause:
The root cause of this problem is that the superblock of the file system has corrupted. The reasons for the superblock corruption could be power failures, virus infections, human errors, etc.
A superblock contains the metadata of the file system that contains all the information such as file system type, size, status, and information of other metadata structures.
Resolution:
To resolve this issue, you need to perform the following steps:
1.Mount the partition under /mnt/sdb3 assuming that corrupted file system is at partition /dev/sdb3.
2.Take an image of the disk by the following command:
dd if=/dev/sdb3 of=/sdb3-backup/image/backup
3.Use the following commands to restore the superblock:
dd if=/dev/hda2 of=/dev/xyz
and
e2fsck -b 32768 /dev/xyz
4.Copy the data using the following command:
cd /mnt/sdb3
cp -R /mnt/sdb3/data /sdb3-backup/copy/.
However, if you are unable to rectify the issue using the aforementioned method then you should use a third-party Linux data recovery software. Such read-only tools employ fast yet sophisticated scanning algorithms to recover data from various types of hard disks such as SCSI, SATA, EIDE, IDE, etc. But before buying any recovery software one should make sure that the software will be able to perform recovery. For this one should download the demo version of the software to check for its recovery capability.
Consider a scenario wherein you are not able to boot your ext3-based Linux system.
Cause:
The root cause of this problem is that the superblock of the file system has corrupted. The reasons for the superblock corruption could be power failures, virus infections, human errors, etc.
A superblock contains the metadata of the file system that contains all the information such as file system type, size, status, and information of other metadata structures.
Resolution:
To resolve this issue, you need to perform the following steps:
1.Mount the partition under /mnt/sdb3 assuming that corrupted file system is at partition /dev/sdb3.
2.Take an image of the disk by the following command:
dd if=/dev/sdb3 of=/sdb3-backup/image/backup
3.Use the following commands to restore the superblock:
dd if=/dev/hda2 of=/dev/xyz
and
e2fsck -b 32768 /dev/xyz
4.Copy the data using the following command:
cd /mnt/sdb3
cp -R /mnt/sdb3/data /sdb3-backup/copy/.
However, if you are unable to rectify the issue using the aforementioned method then you should use a third-party Linux data recovery software. Such read-only tools employ fast yet sophisticated scanning algorithms to recover data from various types of hard disks such as SCSI, SATA, EIDE, IDE, etc. But before buying any recovery software one should make sure that the software will be able to perform recovery. For this one should download the demo version of the software to check for its recovery capability.
Stellar Phoenix Linux Data Recovery is an efficient ext3 recovery software that enables you to recover lost data from Linux systems. Apart from recovery of ext3 file systems, it is able to effectively perform ext2 recovery and ext3 recovery. This Linux data recovery tool is supported by various Linux distributions such as Red Hat, SUSE, Debian, Caldera, Mandrake, Sorcerer, TurboLinux, Slackware, Gentoo, etc. This tool is compatible with Windows 7, Vista, Server 2003, XP, and 2000.
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