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<P>May 16, 2012</P>
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<P>Dear Gluster Dev Team :</P>
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<P>I'm Ethan, Assistant engineer in Samsung electronics. Reviewing your paper, I have some questions of performance factors in gluster.</P>
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<P>First, what does it mean the option "performance.cache-*"? Does it mean read cache? If does, what's difference between the options "prformance.cache-max-file-size" and "performance.cache-size" ?</P>
<P>I read your another paper("performance in a gluster system, versions 3.1.x") and it says as below on Page 12,</P>
<P>(Gluster Native protocol does not implement write caching, as we believe that the modest performance improvements from rite caching do not justify the risk of cache coherency issues.)</P>
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<P>Second, how much is the read throughput improved as configuring 2-way replication? we need any statistics or something like that.</P>
<P>("performance in a gluster system, versions 3.1.x") and it says as below on Page 12,</P>
<P>(However, read throughput is generally improved by replication, as reads can be delivered from either storage node)</P>
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<P>I would ask you to return ASAP.</P>
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<P>Sincerely yours,</P>
<P> </P><!--SP:ej1515.park-->
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<P><STRONG><SPAN style="FONT-FAMILY: Arial; COLOR: #3733cc; FONT-SIZE: 12pt"></SPAN></STRONG> </P>
<P><STRONG><SPAN style="FONT-FAMILY: Arial; COLOR: #3733cc; FONT-SIZE: 12pt">Ethan Eunjun Park</SPAN></STRONG></P>
<P><SPAN style="FONT-FAMILY: Arial; COLOR: #7b7bc0"></SPAN> </P>
<P><SPAN style="FONT-FAMILY: Arial; COLOR: #5755aa">Assistant Engineer, </SPAN></P>
<P><SPAN style="FONT-FAMILY: Arial; COLOR: #5755aa">Solution Development Team, Media Solution Center<CODE id=_NAMO_SYNC_START></CODE></SPAN></P>
<P><SPAN style="FONT-FAMILY: Arial; COLOR: #5755aa">416, Maetan 3-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-742, Korea</SPAN></P>
<P><SPAN style="FONT-FAMILY: Arial; COLOR: #5755aa">Mobile : 010-8609-9532</SPAN></P>
<P><SPAN style="FONT-FAMILY: Arial; COLOR: #5755aa">E-mail : </SPAN><A href="mailto:ej1515.park@samsung.com"><SPAN style="FONT-FAMILY: Arial; COLOR: #5755aa">ej1515.park@samsung.com</SPAN></A></P>
<P><A href="http://www.samsung.com/sec"><SPAN style="FONT-FAMILY: Arial; COLOR: #5755aa">http://www.samsung.com/sec</SPAN></A></P>
<P> </P><!--ej1515.park:EP-->
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