No /dev/urandom

 
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TYP3R
Frequent Advisor

No /dev/urandom

HI Guru's

I'm, having trouble with the following:

#/dev/urandom of=/dev/rdsk/c#t#d# bs=512k conv=noerror

I get /dev/urandom: No such file or directory

Do i need to create a directory with the /dev/urandom file init ? With the same principles with the /dev/zero ? eg:

#mknod /dev/urandom c 3 0x00003
#chmod 444 /dev/urandom

If soo how can this actually write in random instead of the begining to end of disk ?

Thanks for the help

Will
11 REPLIES 11
Luk Vandenbussche
Honored Contributor

Re: No /dev/urandom

Will,

I don't know what you are trying to do, but
/dev/urandon cann't be used as a command.

Possible there is a mistake in the output of your command?
TYP3R
Frequent Advisor

Re: No /dev/urandom

Hi Luk

I got this from this thread:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=972440

I know that i can use this command:

dd if=/dev/zero of=/dev/rdsk/c#t#d# bs=512k

But i assume that the /dev/urandom will write 0's all over the disk randomly ( Like a butterfly effect) than from beging to end, But i get an I/O error with the /dev/zero comamnd, Is there a way to get rid of the error as oseek=1 or conv=noerror doesnt work

Will
Steven E. Protter
Exalted Contributor
Solution

Re: No /dev/urandom

Shalom,

With HP-UX 11.11, you may need to install the strong randome number generator to accomplish this task.

http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=KRNG11I
Reboot required


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Steven E Protter
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Dennis Handly
Acclaimed Contributor

Re: No /dev/urandom

>Luk: /dev/urandon can't be used as a command.

I believe it was:
# dd if=/dev/urandom of=/dev/rdsk/c#t#d# bs=512k conv=noerror
TYP3R
Frequent Advisor

Re: No /dev/urandom

HI SEP

Thanks for the link but after i've read it, Its not what i really want, All i want is to write zero randomly across the disk ( Butterfly Effect) with the command:

dd if=/dev/zero of=/dev/rdsk/c#t#d# bs=512k

Instead of writing zero from start-end of the disk.

Is this possible at all ? or am i been to picky on the way it writes zero on the disk ?

Will
Dennis Handly
Acclaimed Contributor

Re: No /dev/urandom

>All i want is to write zero randomly across the disk (Butterfly Effect)

Do you want to shake the disk apart?
Can you say why you want to do this?

>Is this possible at all?

Only if your write your own application.
TYP3R
Frequent Advisor

Re: No /dev/urandom

Dennis

It just that a customer want us to write zeros to a disk in that way

Will

Dennis Handly
Acclaimed Contributor

Re: No /dev/urandom

>It just that a customer want us to write zeros to a disk in that way

Is he trying to destroy the data on the disks?
TYP3R
Frequent Advisor

Re: No /dev/urandom

Well Dennis if you read what i want to do,

Writing zeros do destroy the data on the disk.

If you not going to help me out then stop moaning what other people saying as they are trying to help me out unlike you.