RE: Huge drivespace Re: computing budgeting (fwd)

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From: Joseph S. Barrera III (
Date: Thu Sep 07 2000 - 09:26:55 PDT

Some questions to think about:

How do you back up a 10 TB disk?

If you forgot where you put something
on a 10 TB disk, how long does it take
to do a grep on the whole thing?

Let's say we're really optimistic
and you can read your 10 TB disk
at 100 MB/s. Then to read the whole
thing, you need

10^7 MB / 10^2 MB/sec = 10^5 sec

10^5 sec / 3600 sec/hr = 27.8 hours

... so it takes more than a day
to do a linear scan of the disk.
If you're grepping, or actually
reading files from a file system,
then it's going to take a lot longer.

Jim Gray has a talk on his website
that goes into more detail about
the challenges of huge disks.
If I have time, I'll track it down.

- Joe

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