[Lustre-discuss] very slow IO using o_direct write on RHEL 5.1

Alex Lee alee at datadirectnet.com
Mon Sep 8 06:30:19 PDT 2008


> How big is the IO size?  Without writes of at least 8MB (or larger)
> in order to keep enough IOs in flight to saturate the network.
>
>   

I'v tried 8mb and 16mb and speed doesnt seem to change from 4mb. hmm...




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