urgent help required - can not umount the filesystem

[Fang Jin]

Hi,
I am doing some file system resturcturing tasks.
I never encounter this problem before:
I couldn't umount the filesystem(my database datafiles' mounting point) with errors:
umount: cannot umount /oracle/PRD/sapdata1: Blcok device required. And now all datafiles's
mounting point size become 604547.
My bdf command displays:
/dev/vg05/lvol3 604547 353112 190980 65% /oracle/PRD/sapdata9
/dev/vg06/lvol2 604547 353112 190980 65% /oracle/PRD/sapdata8
/dev/vg03/lvol3 604547 353112 190980 65% /oracle/PRD/sapdata7
/dev/vg05/lvol2 604547 353112 190980 65% /oracle/PRD/sapdata6
/dev/vg05/lvol1 604547 353112 190980 65% /oracle/PRD/sapdata5
/dev/vg04/lvol2 604547 353112 190980 65% /oracle/PRD/sapdata4
/dev/vg04/lvol1 604547 353112 190980 65% /oracle/PRD/sapdata3
/dev/vg03/lvol2 604547 353112 190980 65% /oracle/PRD/sapdata2
/dev/vg03/lvol1 604547 353112 190980 65% /oracle/PRD/sapdata1

Which shouldn't be.
Could anyone give me the instruction how to solve it? (I have to finish the all tasks within today)
Many thanks in advance.

Jin

[Varghese Mathew]

Hi,

The most common error for what you can search for is the sequence you have mounted those filesystems, which results in the kind of said errors, nothing else.
I have observed these errors in our SAP systems in the very similar manner.You can gor to the specific directory /oracle/PRD/sapdata1 and see the output of "#bdf .", which will give yu the idea whether you are in the correct file system or somewhere else. You can even verify the /etc/mnttab the file syetm is pecified in that file too or not..

In the mentioned scenario, it can be a problem that after you have mounted the /oracle/prd/sapdata1, you might have tried to mount /oracle/prd as another file syetm, and then you are trying to unmount the file system which was mounted earlier..

Hope this helps a bit ..
Cheers !!!
Mathew

[Fang Jin]

System is recovered now, after rebooting.
The problem you mentioned might be one of the root cause. I couldn't remember sequence by which I mounted the system. But if I have mounted /oracle/PRD/sapdata1 already, would I
be able to mount /oracle/PRD to another file system? In my idea, /oracle/PRD must be mounted first, isn't it?
There could be another reason: I tried to change oracle redo log file systems and archive filesystems to non-mirroring. After which I did manually lvcreate with specified harddisk. However since this wouldn't update fstab, I had to manually add in the new entry for this creation.
Also noticed that when system rebooted it did resynconization of all mounting points which I didn't see before.

Thanks for your help.
Jin