[Aurora-sparc-user] 15,000 RPM SCSI drive in an Ultra 1

[Tom 'spot' Callaway]

On Thu, 2007-01-18 at 23:47 -0600, John Zbesko wrote:
> So, I have a pair of Compaq Proliant 36GB scsi drives I'm using in an
> Ultra 1, mostly because they're 36GB (and were surplus!) and not because
> they're 15,000 RPM. But I'm surprised that hdparm only reports 7.24
> MB/sec. Have I reached that unusual point where the CPU/controller, not
> HD is the bottleneck?!

Sun says:


SBUS Bus bandwidth:
(data transfer rate)
25MHz/32-bit, max.
100MBytes/sec for 32-bit.
200 MBytes/sec for 64-bit

PCI Bus bandwidth:
33MHz (rev 2.0) or 66 MHz for
PCI/66, 32/64bit, maximum rate from
132MByte/second (33MHz/32-bit)
to 528MByte/second (66 MHz/64-bit).

So, if you're bottlenecking on the controller, there could be a reason.
Its not 7MB/s bad, but still.

~spot