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The theoretical speed of SATA is 150 MB/sec, correct? # /sbin/hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 168 MB in 3.02 seconds = 55.67 MB/sec I'm consistently getting results ...
  1. 04-11-2007 #1
    thehemi
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    Serial-ATA Performance

    The theoretical speed of SATA is 150 MB/sec, correct?

    # /sbin/hdparm -t /dev/sda
    /dev/sda:
    Timing buffered disk reads: 168 MB in 3.02 seconds = 55.67 MB/sec

    I'm consistently getting results in the ~55 MB/sec range.
    Has anyone else run these tests on SATA? What results?

    I'm curious if that's normal due to system overheard, or if
    there's a chance I could use some hard drive tweaking for
    a little bit more performance out of my box.
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  2. 04-11-2007 #2
    Juan Pablo
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    Are you using DMA on your disks?
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  3. 04-12-2007 #3
    Zelmo
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    Disks never transfer anywhere near the interface's limit; they're restricted by a combination of spindle speed and data density.

    Running the same hdparm test on my Raptor drive, I get about 77MB/s. Western Digital quotes the sustained transfer rate as being 84MB/s; storagereview.com has the same drive doing sustained transfers in the range of 60-88MB/s (transfer rate varies depending on which part of the disk is being read).
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  4. 04-12-2007 #4
    thehemi
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    Quote Originally Posted by Juan Pablo
    Are you using DMA on your disks?
    # /sbin/hdparm -v /dev/sda

    /dev/sda:
    HDIO_GET_MULTCOUNT failed: Inappropriate ioctl for device
    IO_support = 0 (default 16-bit)
    readonly = 0 (off)
    readahead = 256 (on)
    geometry = 10011/255/63, sectors = 82348277760, start = 0

    My understanding is 'hdparm' is not too useful for SATA drives.
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