i have been measuring the performance of my cluster.<br>
It is compsed of 4 machines, each machine exports 1 sata disk (maxtor maxline III),<br>
and theses machines are connected 1 Gbps ethernel drive.<br>
<br>
Peformance :<br>
I am getting about 40% decrease in performance when i simply read a file.<br>
<br>
1. Would switching to infiniband make it faster ?<br clear="all"><br>
2. What is GNBD IO model ? <br>
<br>
2.1 Does it use async io ? <br>
multithreaded IO ? <br>
sync IO ?<br>
<br>
2.2 When a GNBD servs a node , does it know what is amount of data it needs<br>
to fetch right from the start ? <br>
Meaning , if a node asks for 1MB buffer, would GNBD read 1 MB buffer<br>
or several small chunks ?<br>
<br>
Thanks<br>-- <br>Raz<br>