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тАО05-04-2005 09:14 AM
тАО05-04-2005 09:14 AM
anybody use bcwipe?
I've got an HPUX 11.0 and I'm trying to use bcwipe to clean a filesystem. The problem is that the process, at least to me, completes way too fast. To perform a thorough cleaning of a filesystem I would expect the process to take at least somewhere in the neighborhood of thirty minutes for a 30GB filesystem - even if there's less than 2GB of actual use.
Am I wrong?
Thanks
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тАО05-04-2005 09:31 AM
тАО05-04-2005 09:31 AM
Re: anybody use bcwipe?
Because of the nature of the tool and LVM I guess, newfs is very fast.
I do newfs -F vxfs -o largefiles /dev/vg01/rlvol1
On a 120 GB filesystem and it is irrecoverably wiped in much less than a minute, depending on disk speed and configuration.
After running that command there is no way I know of to recover the data.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
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тАО05-04-2005 09:37 AM
тАО05-04-2005 09:37 AM
Re: anybody use bcwipe?
Thanks again.
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тАО05-04-2005 10:09 AM
тАО05-04-2005 10:09 AM
Re: anybody use bcwipe?
The lesson to be learned from my post is its not unreasonable for bcwipe to be able to init 100 GB of filesystem in a short time. If newfs can do it, so can bcwipe, which may be using newfs under the hood.
In other words, nothing to worry about based on timing.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО05-04-2005 10:34 AM
тАО05-04-2005 10:34 AM
Re: anybody use bcwipe?
A better answer though still not quite rigorous would be something like this:
dd if=/dev/zero bs=64k of=/dev/vg01/rlvol3
11.11 boxes can also use the /dev/urandom device to write random data but 11.0 only has NUL's. You could do something like this:
dd if=/dev/zero bs=64k | tr "[\000]" "[\377]" > /dev/vg01/rlvol3
This would write '1's to every location so it would do a good job if combined with the above example which writes all zero's.
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тАО05-04-2005 10:53 AM
тАО05-04-2005 10:53 AM
Re: anybody use bcwipe?
Thanks A. Clay.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО05-04-2005 10:58 AM
тАО05-04-2005 10:58 AM
Re: anybody use bcwipe?
An OS install won't wipe disks either. It'll just overwrite the VGRA and LVRA if there are no files on it. That's ALL. If you were to do a dd on a disk (as Clay mentioned above) I bet you'd find the same thing.