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I have a problem now , when I cd to this path /tmp/ora1 , the server will hang up , besides , I can not do backup now .
Can advise how to fix it ?
It is unlikely that kernel was blocked because of cd to unstable path. Try to log on from a different virtual terminal. There is a problem that I suppose you have a process that had created file and unlinked it, but it still holds it open. (MS Windows bans this and you will get error message if you try to delete a file that is in use, causing need to reboot in case if a process or service hanged.)
This procedure creates anonymous inode. The inode will remain invisible and in use until process closes it or, more likely, when the process finishes.
You have posted no data as to even guess which process might be responsible.
it is strange that that I type "cd /or" , then the screen is hang , so I think the file system has problem , can help to advise what is wrong ?
Can you post a list of processes from ``ps -ef''? You gave insufficient information for me to help you. Some services use anonymous (unlinked) temp files, that could cause described symptoms. You will not be able to unmount until last such process is terminated and unnamed inodes free'd.
Attempt to unmount such file system could cause described instability and hang terminals. This is my guess of what could be troubling you, but without a list of processes you run it is impossible to tell.
You can use the "-l" option to force unclean umount. This is not advsed, but buggy devices/filesystem can hang the shell for a new second. This is because it try to generate the autocomplete list. The device do not respond so it wait until the kernel I/O timeout trigger. It is in no wait hanging the server, but in some case, it may slow it down. Linux does not scale very well under I/O pressure.
thank all ,
As this is very urgent , I have reboot the server per the approval from management , it works now .
Since you keep posting things about Red Hat ENTERPRISE Linux, we will AGAIN tell you to contact RHEL support...if it's 'urgent' that's why you pay them. Also, this hints at being a filesystem with an Oracle database on it...unmounting it while in use is NOT a good thing.
You're paying for support from both Oracle and Red Hat, yet you have never acknowledged that you have contacted them, or that people have given you that advice.