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 Post subject: 3 x VelociRaptor WD5000HHTZ's: One Slower than the Other 2.
PostPosted: January 9th, 2013, 2:25 
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Joined: November 3rd, 2012, 14:04
Posts: 8
Location: SE Idaho
Hello,

I recently acquired three VelociRaptor WD5000HHTZ drives. Each one has firmware 04.06A00. I downloaded and installed a disk benchmarking program, CrystalDiskMark 3.0.2 x64. I'm sure there are other programs that do more things but I doubt I would know what I was looking at if I used them. I ran the program on all three drives and every time I found that one of the drives, always the same drive, for some reason has a lower sequential read and write. Why is this one drive like this and what, if anything, can I do about it?

The first set of benchmarks were completed with the SATA controller in AHCI mode.
MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]:

Code:
  Test : 1000 MB [F: 0.0% (0.1/465.8 GB)] (x3)
  =========================================================
           Sequential Read :   186.496 MB/s
          Sequential Write :   182.695 MB/s
         Random Read 512KB :    76.386 MB/s
        Random Write 512KB :   127.599 MB/s
    Random Read 4KB (QD=1) :     1.100 MB/s [   268.5 IOPS]
   Random Write 4KB (QD=1) :     3.488 MB/s [   851.5 IOPS]
   Random Read 4KB (QD=32) :     3.447 MB/s [   841.5 IOPS]
  Random Write 4KB (QD=32) :     3.710 MB/s [   905.7 IOPS]

  Test : 1000 MB [G: 0.0% (0.1/465.8 GB)] (x3)
  =========================================================
           Sequential Read :   192.806 MB/s
          Sequential Write :   188.542 MB/s
         Random Read 512KB :    77.621 MB/s
        Random Write 512KB :   130.108 MB/s
    Random Read 4KB (QD=1) :     1.075 MB/s [   262.5 IOPS]
   Random Write 4KB (QD=1) :     3.540 MB/s [   864.2 IOPS]
   Random Read 4KB (QD=32) :     3.432 MB/s [   837.9 IOPS]
  Random Write 4KB (QD=32) :     3.938 MB/s [   961.4 IOPS]

  Test : 1000 MB [H: 0.0% (0.1/465.8 GB)] (x3)
  =========================================================
           Sequential Read :   193.607 MB/s
          Sequential Write :   189.564 MB/s
         Random Read 512KB :    76.109 MB/s
        Random Write 512KB :   125.328 MB/s
    Random Read 4KB (QD=1) :     1.071 MB/s [   261.4 IOPS]
   Random Write 4KB (QD=1) :     3.246 MB/s [   792.6 IOPS]
   Random Read 4KB (QD=32) :     3.328 MB/s [   812.4 IOPS]
  Random Write 4KB (QD=32) :     3.446 MB/s [   841.3 IOPS]


I wasn't expecting the benchmark program to show me exactly the same results for each drive. Of course one drive would be the slowest of the three. However, I expected each drive's performance to be fairly close to the other and drive F: seems to lagging a little bit more while the other two drives performed about the same.

All three drives together in RAID 0:

Code:
  Test : 1000 MB [C: 41.5% (335.1/806.4 GB)] (x3)
  =========================================================
           Sequential Read :   529.250 MB/s
          Sequential Write :   512.250 MB/s
         Random Read 512KB :    85.095 MB/s
        Random Write 512KB :   180.961 MB/s
    Random Read 4KB (QD=1) :     1.169 MB/s [   285.4 IOPS]
   Random Write 4KB (QD=1) :     6.699 MB/s [  1635.5 IOPS]
   Random Read 4KB (QD=32) :     7.862 MB/s [  1919.5 IOPS]
  Random Write 4KB (QD=32) :    11.255 MB/s [  2747.9 IOPS]


In case you're wondering about the discrepancy of capacity: the C: drive above was actually one of two partitions on the physical drive and the original drive that was cloned to the array was only 1 TB and not 1.5 TB.

I wasn't sure what to try so I changed the order that the drives plug in to the SATA II ports. I thought maybe the motherboard has some kind of quirk which was preventing one of the drives from performing as well as it could. After I started Windows again I spent some time trying to figure out exactly which drive was assigned F, G, and H. I figured it out and gave the drives the same letters they had earlier.

Another set of benchmarks with the controller in RAID mode but no drives in an array:

Code:
  Test : 1000 MB [F: 0.1% (0.7/465.8 GB)] (x5)
  =========================================================
           Sequential Read :   187.917 MB/s
          Sequential Write :   184.446 MB/s
         Random Read 512KB :    77.672 MB/s
        Random Write 512KB :   127.100 MB/s
    Random Read 4KB (QD=1) :     1.098 MB/s [   268.0 IOPS]
   Random Write 4KB (QD=1) :     3.530 MB/s [   861.7 IOPS]
   Random Read 4KB (QD=32) :     3.409 MB/s [   832.4 IOPS]
  Random Write 4KB (QD=32) :     3.733 MB/s [   911.5 IOPS]

  Test : 1000 MB [G: 0.1% (0.7/465.8 GB)] (x5)
  =========================================================
           Sequential Read :   192.788 MB/s
          Sequential Write :   189.479 MB/s
         Random Read 512KB :    76.210 MB/s
        Random Write 512KB :   131.977 MB/s
    Random Read 4KB (QD=1) :     1.087 MB/s [   265.4 IOPS]
   Random Write 4KB (QD=1) :     3.713 MB/s [   906.4 IOPS]
   Random Read 4KB (QD=32) :     3.337 MB/s [   814.8 IOPS]
  Random Write 4KB (QD=32) :     4.023 MB/s [   982.2 IOPS]

  Test : 1000 MB [H: 0.1% (0.7/465.8 GB)] (x5)
  =========================================================
           Sequential Read :   194.722 MB/s
          Sequential Write :   191.224 MB/s
         Random Read 512KB :    79.073 MB/s
        Random Write 512KB :   127.954 MB/s
    Random Read 4KB (QD=1) :     1.089 MB/s [   265.8 IOPS]
   Random Write 4KB (QD=1) :     3.322 MB/s [   811.2 IOPS]
   Random Read 4KB (QD=32) :     3.430 MB/s [   837.5 IOPS]
  Random Write 4KB (QD=32) :     3.453 MB/s [   842.9 IOPS]


Again drive F: has a slightly lower rate of sequential read and write. I have an ASUS P8Z68-V Pro (not Gen 3) motherboard with an Intel Z68 Express chipset. I am using the integrated controllers: Intel’s (4 x SATA II ports, 2 x SATA III ports) and Marvel’s (2 x SATA III ports). I have a 1 TB WD Black drive connected to an Intel Z68 SATA III port and the three VelociRaptor drives are connected to the Intel Z68 SATA II ports. The DVD drive is connected to a Marvel port.

I also tried doing a benchmark on the slower drive while only that one drive was connected to a SATA II ports. All other drives were disconnected from the SATA II ports. The results weren’t very different.

Code:
  Test : 1000 MB [F: 0.1% (0.7/465.8 GB)] (x5)
  =========================================================
           Sequential Read :   187.681 MB/s
          Sequential Write :   184.657 MB/s
         Random Read 512KB :    77.736 MB/s
        Random Write 512KB :   127.737 MB/s
    Random Read 4KB (QD=1) :     1.095 MB/s [   267.2 IOPS]
   Random Write 4KB (QD=1) :     3.484 MB/s [   850.5 IOPS]
   Random Read 4KB (QD=32) :     3.439 MB/s [   839.6 IOPS]
  Random Write 4KB (QD=32) :     3.765 MB/s [   919.1 IOPS]


Any ideas or suggestions?


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