In JFS (Journaled File System) of HP-UNIX, you can attach special purpose file system to the directory on file tree using mount_JFS command. It makes the data access fast and thus improves the performance of your system. But if you want to use this option on a volume that is using online file system, you might encounter file system corruption and may face serious data loss situations. To sort out such issues, you need to opt for Hp Unix Data Recovery.
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.
