My newly bought hdd-s seem to have lower than expected rw-speed
Hi!
I have recently bought 2 hdds, they run absolutely fine, but after doing some benchmarks I think that may be some configuration is wrong, because read speed seems sort of substandard: Western Digital Raptor 74GB SATA 16MB 10000RPM hdparm -t /dev/sda => 85 mb/s hdparm -T /dev/sda => 1700 mb/s Western Digital Caviar GP 500GB SATA2, 16MB 7200RPM hdparm -t /dev/sdb => 75 mb/s hdparm -T /dev/sdb => 1700 mb/s I at least expected the Raptor (with 10k rpm) to be quicker than this. Does anyone know what I may be doing wrong? ### ATTACHMENT: output of "hdparm -i" ### Code:
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq } Code:
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq } |
It is working as best as it can (udma6).
What is wrong with 85MB/s? If it "works fine" then what is your problem? Why have you posted your code in such a tiny font? It's impossible to read. The LQ defaults are fine, and preferable. |
Looks OK.
Are the Sata settings ok: jumpers, AHCI ? |
Thank you both for your replies :)
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The increased spindle speed of the Raptor isn't so much about delivering greater transfer rates as it is in focusing on markedly lower seek times.
If you want extreme transfer rates, put two drives in a striped (RAID 0) config... of course, then there's no redundancy, so there is a tradeoff. :) 85 MB/s is nothing to sneeze at, performance-wise. Sure, it's not a full 133 MB/s as the UDMA6 spec provides, but you'll be hard pressed to find any drive out there that can run that speed in a standalone configuration (that doesn't require NASA's budget). Sorry the Raptor isn't exactly what you expected. For what it's worth, I think they're great drives, and use them myself. But if you want the most performance, you'll need to set up some kind of RAID config with at least two of the puppies. |
Thanks for a great explanation, strick1226 :D
I *do* notice the shorter seek times since I have my root fs on the Raptor, from a purely subjective standpoint - I haven't done any benchmarks :) |
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