when i start to bakeup the dirctory /etc, i get some messages like this :

DUMP: Change Volumes: Mount volume #2
DUMP: Is the new volume mounted and ready to go?: ("yes" or "no") yes
DUMP: Volume 2 started with block 31271 at: Sun Mar 4 21:53:23 2012
......


then i want to show details with restore -t -f etc.dump

it tells me ，
Level 0 dump of / (dir etc) on localhost.localdomain:/dev/mapper/VolGroup00-LogVol00
Label: none
restore: Tape is not volume 1 of the dump

what‘s wrong with it ？ what is the 　concept of volume,　is it the same as the phycial volume？？？

Not enough info to help you.

1. What sort of device are you doing the dump(8) to?
2. What dump(8) command are you using, exactly?

(Please utilize code tags where appropriate.)

the /etc is mounted on /dev/mapper/VG_lg100 , i try to dump the /etc/ with dump -0j /media/etc.dump /etc

in the process. it show me
DUMP: Change Volumes: Mount volume #2
DUMP: Is the new volume mounted and ready to go?: ("yes" or "no") yes
DUMP: Volume 2 started with block 31271 at: Sun Mar 4 21:53:23 2012
.....

/etc should not be mounted on its own filesystem, so presumably you're doing a dump(8) of all of the / filesystem.

You didn't answer about the device that you're writing the dump(8) to. I think you intend to write it to a file on /media.

Use the command:
If you really have /etc mounted to its own filesystem (I hope not), then modify the last / to be /etc instead.

Finally, let's see output on your system from:
Use code tags so that others can more easily read your output.

BTW, jayway, dump(8) is most commonly (at least in my experience) used to back up entire filesystems, not necessarily just directories. For that task, it's fantastic. But if all you really want to do is back up /etc, then make life easy and use tar(1).

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