Re: 15,000 RPM SCSI drive in an Ultra 1
"Tom 'spot' Callaway" <[email protected]>
| Newsgroups | gmane.linux.aurora.user |
|---|---|
| Organization | Red Hat |
| Message-ID | <[email protected]> |
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 _______________________________________________ Aurora-sparc-user mailing list [email protected] http://lists.auroralinux.org/mailman/listinfo/aurora-sparc-user Aurora FAQ: http://www.ecs.soton.ac.uk/~mas01r/aurorafaq.html