hi,all
Recently,we have a test to compare async i/o and sync i/o in OSD.
The osd jounral was written in sync + direct io mode now, that heavily
infuluenced the write performance.
we use linux aio API. test file size is 40MB,and disk isn't busy.
here is the test result:
type ext3
sync write+direct io 4.441s
async write +direct io 0.462s
we are glad to see that, so we want to affirm that :
1) can we use async+direct io to achieve better write performance if
we used osd journal?
2) does this bring some problems?
thank you in advance!
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