On 14/10/16 14:31, Mark Hahn wrote:
Yes I agree with you but my lustre filesystem can have many small files
so I Was trying to do a test similar
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?
to the real life situation.
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