E pur si muove

Writing entropy

Saturday, August 18, 2007

Q: How long does it take to write a 120 GB disk full with random data?

A: 15 hours, 2 minutes and 27 seconds.

Obviously this depends on the machine. For me it was going at just under 8 minutes per GB, others report around 5 minutes per GB. Also this was using /dev/urandom as input for dd, wich is obviously not really random. I don't even want to think about how long it would take using /dev/random.

Saturday, August 18, 2007 |


Jesse said...

I've had to (on occasion) fill large amounts of disk/storage space fairly rapidly - reading off of /dev/urandom with $N threads with additional threads generating entropy (say, pinging the local NIC, reading dict/words) improves the write speed and can really generate multi-gb files in minutes.

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