[Linux-cluster] Reduced performance question
raziebe at gmail.com
Mon Dec 19 06:37:56 UTC 2005
i have been measuring the performance of my cluster.
It is compsed of 4 machines, each machine exports 1 sata disk (maxtor
and theses machines are connected 1 Gbps ethernel drive.
I am getting about 40% decrease in performance when i simply read a file.
1. Would switching to infiniband make it faster ?
2. What is GNBD IO model ?
2.1 Does it use async io ?
multithreaded IO ?
sync IO ?
2.2 When a GNBD servs a node , does it know what is amount of data it
to fetch right from the start ?
Meaning , if a node asks for 1MB buffer, would GNBD read 1 MB
or several small chunks ?
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