topic Re: Disk maintenance in Operating System - HP-UX

Disk maintenance

Dale Barnes — Tue, 22 Aug 2000 13:56:40 GMT

Is there a way on HP-UX to find which file a particular block belongs to.
E.g., I sometimes get messages during fsck that a particular block cannot be read.
If that block is part of a file, it would be nice to know which file.

Re: Disk maintenance

Antoanetta Naghiu — Tue, 22 Aug 2000 14:03:47 GMT

How do you get the Forum? Via Unix?
Just play with edit commands (copy and past).
If you have CDE via Exeed into PC, play with the right button of the mouse->edit.
For xstart, it is the same highlight and copy and to past it you can use Past Special...
But, it is another easy way, doesn't matter what you use: redirect the output to a file #command >file. Attach the file direct to the forum or email it to yourself...

Re: Disk maintenance

Stefan Farrelly — Tue, 22 Aug 2000 14:03:52 GMT

Ive never heard of a way of finding out which file a particular block belongs to on HP-UX, but you could do it the other way around. For each file on a filesystem dd it to /dev/null and if that file is on a block which cant be read you will get an I/O error when accessing it. eg;

cd /tmp
for i in `find . -print`
do
echo $i
dd if=$i of=/dev/null bs=64k
done

Re: Disk maintenance

John Palmer — Tue, 22 Aug 2000 14:04:08 GMT

fsdb the filesystem debugger
man fsdb
man fsdb_hfs
man fsdb_vxfs

would be able to give you the information but only if you know what you are doing!

Re: Disk maintenance

Antoanetta Naghiu — Tue, 22 Aug 2000 14:06:57 GMT

Sorry, I mixed up posts.

Re: Disk maintenance

Dale Barnes — Tue, 22 Aug 2000 14:17:31 GMT

I understand that there was once a utility called icheck (on Sun OS I believe), which was able to take a block address and find the file, if one existed, that owned the block. It seems that such a utility would not be that difficult to write, if one understood the inode structure. Just thought I would offer that as background for my question.

Re: Disk maintenance

Antoanetta Naghiu — Tue, 22 Aug 2000 14:45:08 GMT

Interesting question. Knowing the fs layout (vxfs and hfs), see man inode and man ncheck.
ncheck it is suppose to give you a list of the path names from inode numbers. You might get it.
Good luck

Re: Disk maintenance

Anthony deRito — Tue, 22 Aug 2000 14:56:17 GMT

Paul, check out the man page for ncheck, ncheck_vxfs and ncheck_hfs. It seems there are ways to do this using ncheck. You can print filenames by specifying block numbers if you know them using the "-o b" option on a vxfs filesystem.

Tony