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  1. #1
    Join Date
    Apr 2009
    Posts
    1,320

    Question hdparm shows very different results for 2 hard drives

    Code:
    /dev/sda:
    Timing cached reads:    31072 MB in  2.00 seconds =
    15549.19 MB/sec
    Timing buffered disk reads:    6 MB in  3.26 seconds = 
    1.84 MB/sec
    
    /dev/sdb:
    Timing cached reads:    33096 MB in  2.00 seconds =
    16562.77 MB/sec
    Timing buffered disk reads:  324 MB in  3.01 seconds =
    107.56 MB/sec
    Smartctl shows no errors, but datacenter is suggesting that I switch out the /sda device with a new hard drive. Is that necessary or is there some way I can tweak that?

  2. #2
    Join Date
    Dec 2005
    Posts
    1,270
    The hard drive that is in use will obviously be slower. But it looks too slow. There might be something wrong with the drive.

  3. #3
    It's either something wrong with the drive, the drive is under heavy use, or the drive is in pio mode. Normally I would expect all drives or no drives to be in pio mode, so my guess is that there's something seriously wrong with the drive. Although it would be worthwhile to take a look at iostat to see if there is just a lot of disk activity going on.
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