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Hello,

On Nov 19, 2007, at 07:08, Andras Barna wrote:

> On Nov 19, 2007 10:38 AM, Gary Parker <G.J.Parker@lboro.ac.uk> wrote:
>>
>> On 19 Nov 2007, at 08:29, Andrew Ball wrote:
>>> Can Ultra 10 and Ultra 5 workstations take ATA drives that
>>> are larger than 120 Gbytes capacity?
>>
>> Yes, my U10 is running a 160GB drive at the moment.
>>
>>> How slow is the ATA
>>> interface on these machines?
>>
>> Very :( They only do ATA33 with no DMA. If disk IO is important to
>> you pop a SCSI adapter in there and nice fast drive.
>>
>
> No DMA? hmm in dmesg i see:
>
> wd0 at atabus0 drive 0: <ST34321A>
> wd0: drive supports 32-sector PIO transfers, LBA addressing
> wd0: 4103 MB, 8894 cyl, 15 head, 63 sec, 512 bytes/sect x 8404830  
> sectors
> wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/ 
> 33)
> wd0(cmdide0:0:0): using PIO mode 4, DMA mode 2 (using DMA)

That means the drive supports UDMA33 but the controller doesn't so it  
falls back to PIO4/DMA2 which gives a theoretical maximum transfer  
rate of about 16MB/s.

> well.. copying from network with ~6MB/s internal (read-write) is  
> ~4-5MB/s

Since it's a rather old drive the bottleneck is probably not the IDE  
controller.

have fun
Michael
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