[lustre-discuss] Lustre on ZFS pooer direct I/O performance
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
> if you write significantly bigger blocks (8-32M)? presumably you're
> 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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