[ale] A little math

[wolf at wolfhalton.info]

The extrapolation presumes a constant rate of fill and may approach the
top throughput available, 
and doesn't account for archiving and removal that may be going on.

a virus that copies a 513byte file infinitely will fill your drive as
quickly as one 
producing 1023byte files because of the sector size issue, won't it? 
Hard drives do not fill uniformly, but mostly fill 512byte blocks. 
The index may or may not accurately show the files number and size
filled.

-----Original Message-----
From: Sean McNealy <sean.mcnealy at gmail.com>
Reply-to: Atlanta Linux Enthusiasts - Yes! We run Linux! <ale at ale.org>
To: Atlanta Linux Enthusiasts - Yes! We run Linux! <ale at ale.org>
Subject: Re: [ale] A little math
Date: Wed, 10 Feb 2010 12:14:49 -0500


Testing to a file on my machine (no raid going on)
512000000 bytes (512 MB) copied, 81.1661 s, 6.3 MB/s

extrapolation: 1TB @ 6.3 MB/s is 44 hours.  Wow, that is a long time.

I forget the relevant specs for this machine, but for comparison
copying that same 512MB file was:
512000000 bytes (512 MB) copied, 7.091 s, 72.2 MB/s

And... now I'm out of entropy!

-Sean

On Wed, Feb 10, 2010 at 11:35 AM, Scott Castaline <skotchman at gmail.com> wrote:
> Okay I've got a dumb question for you math types. How long should it
> take to fill a 1TB hdd with random data using
> "dd if=/dev/urandom of=/dev/sd"? I've done some more searching and found
> some numbers and if I figured them right I'm looking at about 8 days. Is
> this accurate?
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