[lustre-discuss] Lustre on ZFS pooer direct I/O performance

Riccardo Veraldi Riccardo.Veraldi at cnaf.infn.it
Sat Oct 15 22:09:39 PDT 2016

On 14/10/16 14:31, Mark Hahn wrote:
>> anyway if I force direct I/O, for example using oflag=direct in dd, 
>> the write performance drop as low as 8MB/sec
>> with 1MB block size. And each write it's about 120ms latency.
> but that's quite a small block size.  do you approach buffered 
> performance
> if you write significantly bigger blocks (8-32M)?  presumably you're 
> already
> striping across OSTs?
Yes I agree with you but my lustre filesystem can have many small files 
so I Was trying to do a test similar
to the real life situation.

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