[Lustre-discuss] read less than one stripe

Dilger, Andreas andreas.dilger at intel.com
Thu Jul 11 22:06:43 PDT 2013

On 2013-07-11, at 22:20, "Jaln" <valiantljk at gmail.com> wrote:
> If the I/O request is less than one stripe width, what will happen on the OST?
> Is the lustre gonna access the whole stripe?

The stripe size controls the amount of data written to one OST before moving to the next OST. It doesn't control the IO size on the OST itself. The minimum IO size on the OST is 4096 bytes, the blocksize of the underlying ldiskfs filesystem. 

Cheers, Andreas

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