As a practical example, you encounter the below error message, when you attempt to mount your HP-Unix based system:

“vxfs fsck: file system had I/O error(s) on meta-data.
log replay in progress
file system is not clean, full fsck required
pass0 - checking structural files
pass1 - checking inode sanity and blocks
vxfs fsck: fsck read failure bno = 237640, off = 0, len = 8192
file system check failure, aborting…”

The above error message appears each time you attempt to mount your system.

Cause:

The root cause for the above error message, as stated in the error message, is the input/output error(s) in the file system.
Resolution:

The best way to resolve the file system corruption HP-Unix operating system is to run the FSCK command (also suggested in the error message). However, in this case, the FSCK command will not be able to resolve the problem because the command can not resolve the input/output errors. Two ways to overcome the above issue are discussed below:

-> Change the hard drive.
-> Re-install HP-Unix operating system.

In case of fresh re-install of HP-Unix operating system, all the data saved in the hard drive gets erased. To recover the data from the formatted hard drive partition, you will need to use HP-Unix Data Recovery application. These HP-Unix Recovery applications use powerful scanning methods to recover the data from formatted hard drive partitions. Such recovery applications are designed by highly talented engineers and are incorporated with highly graphical user documentation that makes them easy to understand and implement.

Stellar Phoenix HP UNIX Data Recovery is efficient HP Unix Recovery software that supports HP-UX file versions like HP-UX 10.x, 11 and 11i. It gets installed on Windows (2003, XP, 2000, NT3.51 and above, ME, 9x) and the affected HP-UX hard drive should be connected as slave.

As a practical instance, data loss in HP-UX based system occurs after the following sequence of events:

    Disk array is powered down.
    Disk 0 from any enclosure is removed or is not seated properly
    Disk array is powered back up.
    The same disk 0 is replaced in its slot after the disk array has been powered on.

To prevent data loss from HP-UX system, you will need to follow these steps:

    When removing SATA disks from a powered-down disk array enclosure, ensure all disks are fully seated before reapplying power.
    Do not either remove disk 0 when the disk array enclosure is powered down, or reinsert disk 0 after the disk array enclosure is powered back up.
    If after powering up an array, you noticed disk 0 is out or not fully seated, power down the array and replace this disk with a new disk; DO NOT reseat it.

Resolution:

The best possible way to recover the data from HP-UX based hard drive is by using advanced HP-UX Data Recovery application. Such HP-UX Data Recovery applications systematically scan the corrupted hard drive by employing high-end scanning methods. These tools recover lost data post serious corruption scenarios like superblock or inode structure, LVM, Cylinder Groups, OLT damage. With to the point documentation, highly graphical user interface and advanced features, these tools are easy to understand without any prior technical skills.

Stellar Phoenix HP UNIX Data Recovery is a trust worthy HP-UX Recovery application. This non destructive utility is compatible supports HP-UX file versions like HP-UX 10.x, 11 and 11i.  It gets installed on Windows (2003, XP, 2000, NT3.51 and above, ME, 9x) and the affected HP-UX hard drive should be connected as slave.

The mount_JFS command of HP-UNIX system notifies the operating system that special, the JFS block special device, is accessible to the users from the mount point. The mount point must exist before the mount operation is invoked. The mount point becomes the name of the root of newly mounted special file system.

There are some known limitations or issues with the handling of the mount options when mounted file system is also bound with the help of –bind option of generic mount command. In such situations, this is not potential to change the mount options of the bound instances and the only method to change mount options on original mount point is to provide both –t JFS option and block device with –o remount option on command line.

When unmounting the JFS file system, the secondary nodes shouldn’t keep other file system mounted. For example if other nodes are disabled, the unmount command would suspend until the secondary nodes have unmounted the file system. When you attempt to unmount the file system, you might come across the following error message:

“Unable to un-mount primary file system device while still mounted on secondary nodes.”

In such cases, if you try to mount any other file system or accidentally use fsck or any third party file system repair tool, the file system may get damaged and serious data loss can take place.

In such situations, you need to opt for HP-UNIX Recovery software to scan the whole hard drive and extract all data from it. These software are very easy to use tools and enable you to achieve quick and easy HP Unix Data Recovery in almost all data loss situations.

Stellar Phoenix HP UNIX Data Recovery is efficient and user-friendly HP-UNIX Recovery software. The software supports recovery from JFS file system volumes of HP-UNIX 11i, 11 and 10.x. It gets installed on Windows (Windows XP, 2003, 2000, NT & ME) and the UNIX hard drive should be connected as slave.