Stellar Phoenix SCO UnixWare Recovery

Sometimes when you change the file system modes of the files and directories on your SCO UnixWare computer using chmod (or change mode) command in UNIX, the process may fail and your valuable data might go missing. In such situations, to retrieve your data, you should go for SCO UnixWare Data Recovery.

The chmod is C language function and shell command in SCO UnixWare and other UNIX operating systems. It is used to modify the file system mode of the files and directories. These modes include access permissions and special modes.

Only the root user can change the file system mode using chmod command. Chmod command has the below given syntax:

Chmod [options] mode file(s)

The ‘mode’ part of this command specifies the new privileges for the file or directory which follow as arguments.

Although, chmod command is very useful for SCO UnixWare administrators as well as users, but when the file permission changing process does not complete, data loss may occur.

In some cases, when you try to change file system modes of given files and directories, the process may stop with following error message:

“Chmod: changing ownership of `/

mnt/hdc1′: Operation not permitted”

After this error message, the volume on which you applied chmod command, becomes completely inaccessible and put you in serious data loss situation.

In such critical situations, the only way to recover your data is to carry out SCO UnixWare Recovery. It is a systematic procedure to recover lost, missing or inaccessible data from your SCO UnixWare hard drive.

It is best possible using third party UNIX recovery tools, known as SCO UnixWare Data Recovery software. These are highly automated applications that are capable of methodically scanning your affected hard drive and extracting all data from it.

Using SCO UnixWare Recovery software, you can carry out ‘Do It Yourself’ UNIX recovery. These software are easy-to-use tools and they do not require sound technical skills to achieve successful recovery of your mission critical data.

Such software can recover your lost files, directories and hard drive volumes after issues like file system corruption, operating system malfunction, metadata structure corruption, accidental deletion, hard drive formatting, user errors as incorrect use of commands and other similar scenarios.

Stellar Phoenix SCO UnixWare Data Recovery is the most comprehensive and result-oriented SCO Data Recovery application that can handle all logical data loss situations. It supports recovery from VxFS (Veritas File System - VxFS1, VxFS2 & VxFS4) and UFS file system volumes of SCO UnixWare.

SCO UnixWare operating system is a Unix-based operating system that is primarily known for its reliability, stability and scalability. While the operating system is safe and reliable, it can also be corrupted and unmountable due to super block damage or corruption, inode corruption, boot errors, VTOC (Volume Tables of Contents) damage, OLT (Object Location Table) damage and malicious software like virus. In most cases of operating system corruption, you encounter an error message. Once you encounter the error message, the data stored in the hard drive becomes inaccessible. To overcome such situations, the best possible way is to restore the data from an up-to-date backup. However, in case of no backup availability or backup failing short of restoring the required data, you need to use advanced UnixWare Data Recovery Software.

Consider a practical scenario, where you encounter the below error message when you attempt to boot your UNIX based operating system:

“Mar 15 17:26:21 ioccrmprep1 unix: WARNING: msgcnt 31 vxfs: mesg 017:
vx_ilock - /opt/data/ora16/preprod file system inode 10 marked bad”

The above error message indicates that inode 10 has been marked bad. Data saved in the hard drive becomes inaccessible after the above error message appears.

Cause:

The root cause for the occurrence of the above error message is VERITAS File System inode corruption as a result of transient fiber link failures.

Resolution:

To resolve the above error message and access the data, you need to take these steps:

1.    Unmount the file system in order to attempt repairs on corrupted inodes. Use the command to analyze the superblock on the failing file system:
% echo “8192B.p S” | fsdb -F vxfs /dev/vx/rdsk/rootdg/meta
2.    Run a full fsck with the -n option to see which inodes are marked bad
3.    Set the “aflag” field to 0×0 using fsdb.  This step must be done very carefully since it involves writing to the file system structure itself. The incorrect use of fsdb can destroy the file system.
4.    The inode aflag has been cleared for the 3 inodes. Verify it with fsck.
5.    Now it should be safe to run a full fsck with the -y option
6.    Mount the file system and check the inodes

If the above steps fail to resolve the issue, you need to reinstall the file system. These file systems act as pointers to the files and folders saved on the hard drive. Reinstalling the file system will erase all those entries and your data will become inaccessible. In such circumstances, you need to go for an advanced UnixWare Data Recovery Software. Such UnixWare Data Recovery tools use advanced scanning algorithms to recover your lost data.

Stellar Phoenix (SCO UnixWare) Data Recovery is powerful SCO UnixWare Data Recovery utility. It is compatible with VxFS [Veritas File System - VxFS1, VxFS2 & VxFS4] and UFS File systems. It gets installed on Windows (XP, 2003, 2000, NT, ME, 98 and 95) and the affected SCO hard drive should be connected as slave.

Superblock in UNIX operating system contains important information about the file system like file system type, vital numbers describing this file system’s geometry, behavioral tuning parameters, disk layout version number and more. The OLT (Object Location Table), which is referenced from the superblock, is primarily used to at the time of mounting the file system. The information saved in OLT is used to locate the file system structures that are not in fixed locations. Corruption or damage to OLT mainly occurs due to file system damage, unexpected system shutdown, malicious software like virus and more. Two outcomes that you encounter after OLT has been damaged are unbootable hard drive and data inaccessibility. To overcome such situations, you need to restore the data from an up-to-date backup. However, if no backup is available or backup falls short to recover the required data, you need to opt for advanced UnixWare Data Recovery tool.

Consider a practical scenario, where you encounter the below error message after the OLT gets corrupted or damaged:

“#fsck -F vxfs -o full /dev/vg08/ftpresfs
vxfs fsck: OLT extent 0 has bad magic
read of primary OLT failed
vxfs fsck: OLT extent 1 has bad magic
read of OLT copy failed
vxfs fsck: no valid OLT, cannot continue
file system check failure, aborting …”

Data stored in the hard drive becomes inaccessible after you encounter the above error message. In addition, you encounter the same error message each time you attempt to mount your system.

To resolve the above error message and access the data, you need to reinstall the file system. These file systems act as pointers to the files and folders saved on the hard drive. Reinstalling the file system will erase all those entries and your data will become inaccessible. In such circumstances, you need to opt for powerful UnixWare Recovery application.

Such UnixWare Data Recovery tools employ high end scanning methods to recover and restore the lost data. Built with highly graphical and interactive user interface, these applications are easy to understand without prior technical understanding. These applications also recover lost data from corrupt super block file recovery after damage in Inode structures. Such recovery applications also recover the data after FSCK is unable to repair the system data structures.

Stellar Phoenix (SCO UnixWare) Data Recovery is trust-worthy UnixWare Data Recovery application. It supports VxFS [Veritas File System - VxFS1, VxFS2 & VxFS4] and UFS File systems. It gets installed on Windows (XP, 2003, 2000, NT, ME, 98 and 95) and the affected SCO hard drive should be connected as slave.

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