topic Big files creation. in Operating System - HP-UX

Big files creation.

Simone Benzi_1 — Fri, 11 Jun 2004 07:12:19 GMT

Hello everybody,

How can I create a 1 Gb file in a quick and simple way (hpux 11.00)?

Thanks a lot,

Simone

Re: Big files creation.

Robert-Jan Goossens — Fri, 11 Jun 2004 07:16:05 GMT

Hi,

# prealloc file 10000000

regards,
Robert-Jan

Re: Big files creation.

SIJU JOSE — Fri, 11 Jun 2004 07:17:22 GMT

Hi Simone

try the following

#prealloc filename sizeinbytes

HTH

SIju Jose

Re: Big files creation.

David Child_1 — Fri, 11 Jun 2004 07:20:26 GMT

Simone,

You can try 'prealloc':

$ prealloc filename size-in-bytes

Example:

$ prealloc mybigfile 1073741824

David

Re: Big files creation.

Mark Grant — Fri, 11 Jun 2004 07:25:06 GMT

While this certainly does this, it gives you a file full of nulls. For most puposes I guess it doesn't make much difference.

However if you want to check compression or encryption speeds or possibly even file transfer speeds using something like "rsync" I'm not sure a file full of nulls is the best way.

One way of generating a large amount of random data is to use "dd" and copy 1GB of swap to some file.

Re: Big files creation.

Simone Benzi_1 — Fri, 11 Jun 2004 07:26:48 GMT

Thanks a lot to everybody!