Re: performance limitations of linux raid

[Michael Robinton]

On Thu, 4 May 2000, Christopher E. Brown wrote:

> On Wed, 3 May 2000, Michael Robinton wrote:
> 
> > The primary limitation is probably the rotational speed of the disks and 
> > how fast you can rip data off the drives. For instance, the big IBM 
> > drives (20 - 40 gigs) have a limitation of about 27mbs for both the 7200 
> > and 10k rpm models. The Drives to come will have to make trade-offs 
> > between density and speed, as the technology's in the works have upper 
> > constraints on one or the other. So... given enough controllers (either 
> > scsii on disk or ide individual) the limit will be related to the 
> > bandwidth of the disk interface rather than the speed of the processor 
> > it's talking too.
> 
> 
>       Not entirely, there is a fair bit more CPU overhead running an
> IDE bus than a proper SCSI one.

A "fair" bit on a 500mhz+ processor is really negligible.
>