disk throughput

[Bernd Walter]

On Wed, Jan 16, 2008 at 10:48:27PM +1300, Atom Smasher wrote:
> i've got this running in one term:
> 	systat -iostat 1
> and this in another term:
> 	dd if=/dev/acd0 bs=2048 count=123456 | md5
> 
> apparently the system only knows about throughput of mounted disks?

It doesn't seem to know about ata CD drives, SCSI CD drives work fine.
Use gstat, which retrieves statistics at a different layer.

You should use a multiple of 2k (e.g. 64k) for blocksize though.
Just using 2k is likely to be much slower.

> is that a bug or a feature?

I would say it's a missing feature in acd driver.

-- 
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