Hard drive performance doubled?

Discussion in 'Mac Pro' started by andypress, Apr 17, 2008.

  1. andypress macrumors regular

    Jun 19, 2003
    Buffalo, NY
    I finally bought my Mac Pro last week, and needless to say it continues to impress me. I was transferring some files from my 1tb Seagate 7200.11 to my boot drive consisting of two 74gb Raptors in software raid 0. Since i've had it, the 4gb files have always transferred at about 60mb/s, but tonight the speed somehow managed to double to a maximum of 127mb/s (and a sustained 100mb/s). Why would the transfer rate double in speed?

  2. krye macrumors 68000


    Aug 21, 2007
  3. ksz macrumors 68000

    Oct 28, 2003
    San Jose, CA
    One explanation might be that some of the 4GB files were already in the disk cache in memory. On some flavors of Linux the disk cache can be emptied using the following:

    echo 3 > /proc/sys/vm/drop_caches

    However, I don't know what the equivalent is in Mac OS.

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