who can tell me that if i can run a linpack in hadoop?

Dear, I am thinking that how to know the performance of hadoop. As a kind of cluster, can we run linpack in hadoop? and how can we do that? thanks!

an error on namenode startup,

Dear, I want to config a 4-site hadoop cluster. but failed. Who can help me to know why? and how can i start it? thanks. environment: Cent OS 5.2, hadoop-site.xml setting: fs.default.name hdfs://master.cloud:9000 mapred.job.tracker hdfs://master.cloud:9001 hadoop.tmp.dir /home/user/hadoop/tmp/