IBM blade server abysmal disk write performances

Wojciech Puchar wojtek at wojtek.tensor.gdynia.pl
Wed Jan 16 07:20:49 UTC 2013


> Transfer rates:
>        outside:       102400 kbytes in   0.685483 sec = 149384 kbytes/sec
>        middle:        102400 kbytes in   0.747424 sec = 137004 kbytes/sec
>        inside:        102400 kbytes in   1.051036 sec = 97428 kbytes/sec

this is right.
> Yet we get only a tiny fraction of those (it takes 20 seconds to transfer 
> 10MB!) when using dd. I also doubt its dd's behavior since how can we explain 
dd is fine. hardware configuration isn't


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