 | | | Enabling DMA for disks in Redhat 3.4 | Enabling DMA for disks in Redhat 3.4 2005-05-09 - By Mike Ault
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Setting the DMA parameters at both the individual drive level
(/etc/sysconfig/harddiskhdc and hardiskhdd had no affect, setting at overall
system level /etc/sysconfig.harddisks had no affect.
Thanks for the suggestion though.
Here are the drive specs, it should be capable if much higher transfer rates
than 5 MB/sec:
Performance Specifications
Rotational Speed 7,200 RPM (nominal)
Buffer Size 8 MB
Average Latency 4.20 ms (nominal)
Contact Start/Stop Cycles 50,000 minimum
Seek Times (Average)
Read Seek Time (Average) 8.9 ms
Write Seek Time (Average) 10.9 ms (average)
Track-To-Track Seek Time 2.0 ms (average)
Full Stroke Seek 21.0 ms (average)
Transfer Rates
Buffer To Disk 602 Mbits/s (Max)
Buffer to Host (EIDE)
- Mode 5 Ultra ATA 100.0 MB/s
- Mode 4 Ultra ATA 66.6 MB/s
- Mode 2 Ultra ATA 33.3 MB/s
- Mode 4 PIO 16.6 MB/s
- Mode 2 multi-word DMA 16.6 MB/s
I can't get the system to change PIO or DMA modes. It sets to Ultra 2, but
without being able to use DMA it only achieves 5 MB/s.
Mike
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