Do you need to dismount /usr to dump it?

[Matt Staroscik]

If I boot to single-user mode (reboot, hit space, do boot -s) and dump /usr 
to a file, I get read errors on a couple of blocks.

Running fsck -y (also in single user of course) did not show a problem, but 
it did not clear up the errors when I tried the dump again.

I thought it was safe to dump /usr in single-user mode. Will I need to boot 
off a CD or try another trick to get a clean dump of /usr? Or perhaps I am 
not using the right fsck options?

the dump command I used is:
dump 0af /someotherplace/filename.dump /usr

This seemed to work fine for / and my other filesystems.

Thanks!

- matt s.
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Matt Staroscik * KF6IYW * mstar at speakeasy.net * http://wrongcrowd.com
"The combined weight of the horrors I have authored wrought would crush
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                                         -- Leonid Kasparov Destroyovitch