Posted on Tuesday, June 08, 2010 at 3:08 AM
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:...
Posted on Saturday, May 29, 2010 at 3:18 AM
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...
Posted on Thursday, April 29, 2010 at 3:25 AM
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...
Posted on Monday, March 29, 2010 at 11:24 PM
Ext4 or Fourth Extended file system is an advanced and reliable Linux file system, which is successor of Ext3 file system. It is a journaling file system, which has emerged very quickly. It adds numerous performance improvements and remove the 64-bit data storage limitations. However, in case of system crash, you may lose your valuable data from Ext4 file system volume, due to delayed allocation. Data loss is a critical situation, which may put you in needs of Linux Data Recovery.
- Delayed Allocation is a feature of Ext4 file system, in which the blocks need to be allocated for holding the pending writes. The disk space for appended information is subtracted from free-space counter, however not really allocated in free-space bitmap. Alternatively, appended data remains in memory until it becomes necessary to be flushed to the storage media because of memory pressure or any other reason.
In Ext4 file system, Delayed Allocation causes some extra risks of the data loss if your system gets crashed before all the data is written to hard drive...
Posted on Tuesday, March 23, 2010 at 2:56 AM
An Ext2 file system contains a component named ’superblock’ to save critical information about the file system. This component, if corrupted, gives an error at the time of mounting of the hard disk partition. The data saved in the hard disk partition becomes inaccessible after the superblock corruption error message pops up. An easy way to access the data post any such error message is by restoring it from an updated backup. However, if backup file is unreadable or incomplete, then the only option is to use a commercial Linux Data Recovery utility.
Consider a real-time scenario, wherein, you receive the underneath error message while trying to mount your hard drive volume:
“ubuntu@ubuntu:~$ sudo e2fsck -c /dev/sda1
e2fsck 1.39 (29-May-2006)
/dev/sda1: recovering journal
/dev/sda1: Attempt to read block from filesystem resulted in short read while reading block Z
JBD: Failed to read block at offset 22321
JBD: IO error -5 recovering block 22321 in log...
Posted on Sunday, March 21, 2010 at 11:21 PM
Linux partitions are basically of three types: swap, root, and home. The swap partition is used for Linux swap space, root partition for Linux and the installed applications, and home partitions for holding /home directory i.e. data. When it comes to data accessibility, the latter two partitions are comparatively more vital for uninterrupted data access. Thus corruption of these partitions can lead to data loss and requires a Linux user to look for Linux Data Recovery
Let’s elucidate these data loss issues using a corresponding example of Ext4 partition and the associated solutions. Consider the following realistic instance observed by a Linux user:
• When trying the boot a Linux computer, the user faces a set of error messages multiple times, but with different numbers:
exception Emask 0×0 SAct 0×1 SErr 0×0 action 0×0
cmd 60/00:00:1f:94:88/01:00:06:00:00/40 tag 0 ncq 131072 in...
Posted on Monday, March 08, 2010 at 2:47 AM
Do you need to add a new disk to LVM volume for expanding it? Or, are you trying to add a new disk on LVM with zero redundancy? You must create complete backup of your precious data before trying out any of the above things. Adding a new disk to LVM volume and then expanding it may cause catastrophic data loss, if any of these drives fails. In case, the backup is not available, Linux Data Recovery is the only way to go.
The LVM (Logical Volume Manager) and LUKS (Linux Unified Key Setup) metadata structures are stored on original drive in Linux volume group. The journaling file system, like Ext4, move around it, as the disk space is employed or occupied.
Although the process of expanding the LVM drive is risky, it is not impossible. You can moderate the method for Ext4, LUKS, and LVM without losing your precious data. To do this, you need at least 4 storage devices, if you are expanding two hard drives...
Posted on Friday, February 19, 2010 at 11:23 PM
The Ext4 (Fourth Extended File System) was released in Linux 2.6.28 as a functionally stable and complete file system. This is a journaling file system, which is a successor of Ext3 file system. Ext4 was developed as a sequence of the backward compatible extensions for removing 64-bit data storage limits. It is undoubtedly safe to use Ext4 file system in production environment, however, delayed allocation may lead to data loss situations. Also, it is not possible to completely prevent user errors, like accidental deletion of data. In such cases, Ext4 Recovery solutions are required to get your valuable data back.
When you delete files from the Ext4 hard drive volume or data is deleted because of formatting of the volume, the files remain physically intact. Deletion does not actually delete the files. It merely deletes the file system entries and file system pointers. Thus, operation system can not locate any files at a location and it declares disk space as available. But, you must know that the deleted files can be recovered by applying Linux Data Recovery methods...
Posted on Thursday, January 28, 2010 at 10:51 PM
In Linux operating system, myrescue is an utility to retrieve still-readable information from damaged hard drive. This Linux Data Recovery tool is similar to the dd_rescue, however it attempts to quickly get out of corrupted area to handle undamaged part first. After extracting data from the undamaged area, the utility then returns to the damaged area and tries to fix it.
The myrescue utility attempts to copy your hard drive block-wise to the file and creates a block bitmap (table) remarking whether the block is successfully copied, not handled yet or it has errors. The block bitmap or table can be employed in the successive runs for concentrating on unresolved blocks.
This Data Recovery Linux utility effectively handles the read errors, through its special skip way. General the hard drive surface blemishes cover more than simply one data block and uninterrupted reading data from the defected areas may damage the hard drive surface, the hard drive mechanisms, and read/write heads...
Posted on Wednesday, January 20, 2010 at 4:26 AM
Modern distributions of Linux operating systems use UUID (Universally Unique Identifier) to uniquely identify hard drive or other data storage devices, in place of the conventional block names like /dev/sdb and /dev/hda1. It is due to the fact that UUID is never modified, even if the hard drive is switched. It is stable as compared to traditional methods, and prevents system failure and need of Linux Data Recovery solutions.
UUID is a 128-bit string that is used for making the Linux hard disk management simple. If you look at /etc/fstab file in your Linux computer, you find the entry in the following format, in place of the familiar hard drive designation:
In comparison to the traditional hard drive identification techniques, UUID is quite easy and reliable. For instance, in the traditional Linux systems, when you try to insert a new hard drive in a system that already has two hard drives, the drive is inserted between existing drives. At this point, 'mount' command attempts to mount the newly inserted drives as home...