Hi Nikhil, On Mon, 13 Aug 2012, Nikhil Sethi (निखिल सेठी) wrote:
Using dd to seek to random places in disk and reading I think I am getting ~60MB/sec which is more respectable. It varies a lot more if I only read ~200MB which is what hdparm seems to do. net6501 ~ # time dd if=/dev/sdb bs=$((1024*1024)) seek=$((54565*1024*1024)) count=1024 of=/dev/null 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 17.9964 s, 59.7 MB/s
Perhaps the disk goes into power saving mode (spins down) quite quickly, and therefore during the first test it has to wake up, but in subsequent tests it's still spinning?
You might want to watch out for fast-rising Load Cycle Counts if that's happening.
Yes. It does seem quite low, so I think I might have mis-configured something. Would be nice to hear someone getting higher speeds.
Did you get the numbers I posted? Using a different disk, the OCZ Solid3 SSD: Timing cached reads: 852 MB in 2.00 seconds = 425.98 MB/sec Timing buffered disk reads: 342 MB in 3.02 seconds = 113.24 MB/sec Cheers, Chris. -- Aptivate | http://www.aptivate.org | Phone: +44 1223 967 838 Future Business, Cam City FC, Milton Rd, Cambridge, CB4 1UY, UK Aptivate is a not-for-profit company registered in England and Wales with company number 04980791.
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