14.7 mb/s write speed for SATA raid?

  • Thread starter Thread starter Nick
  • Start date Start date
N

Nick

I've heard that write speeds are not improved all that much by either sata
or raid. Hoping from some improvement, I've just moved a Raid 0 (striped)
partition from 2 maxtor drives to 2 new WD ones.

----------------------
OLD hard drives
----------------------
Maxtor D740X-6L 40GB
Interface Ultra ATA/133
- Buffer Size 2 MB
- Rotational Speed 7200 RPM
- Avg. Rotational Latency 4.2
- Avg. Seek Time (Read) 8.5 ms
Rotational Latency 4.2ms
Average Seek Time (Read) 8.5ms
Average Track-to-Track Seek Time (Read) 0.8ms
Average Full Stroke Seek Time (Read) 17.8ms

Seek Time (Read) 0.8 ms

----------------------
NEW hard drives
----------------------
WD Caviar SE16
Rotational Speed 7200 RPM (nominal)
Buffer Size 16 MB
Average Latency 4.20 ms (nominal)
Read Seek Time 8.9 ms
Write Seek Time 10.9 ms (average)
Track-To-Track Seek Time 2.0 ms (average)
Full Stroke Seek 21.0 ms (average)

Transfer Rates
Buffer To Host (Serial ATA) 300 MB/s (Max)
Buffer To Disk 748 Mbits/s (Max)


(FreshDiagnose reported that the read and writes were as follows...)

Read Write

OLD Raid 0 array 30 mb/s 20 mb/s
NEW Raid 0 array 880 mb/s 14.7 mb/s***


***How can this be?

Nick
 
Well the old drive was a striped raid array also. How can I only be getting
15mbs write speed with these drives?

The partition was backed up to an image and then restored to a disk using
ghost.

Nick
 
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