[sclug] Best drive arrangement?

[David Given]

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David Given wrote:
[...]
> What I'd suggest is trying some benchmarks. 'hdparm -t -T /dev/hd?' will
>  measure the transfer speed of a drive. (It'll give you two numbers, one
> the speed the drive's hardware can push data over the cable, and the
> other the speed it can read data off the disk.) If you try this in
> various combinations, you should be able to figure out the best combination.

Okay, ignore that paragraph, it's wrong.

- -T measures the speed that Linux can transfer data in and out of its own
buffer cache, and isn't useful in your case.

- -t measures the speed that the drive's hardware can push data over the
cable, and is the one you're looking for (but the figures will be more
accurate if you specify -T as well).

Apparently I've been using hdparm for years without noticing that a
transfer speed of 4GB/s is a bit unlikely. Ho hum...

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