nfs 튜닝

http://www.slashroot.in/how-do-linux-nfs-performance-tuning-and-optimization

1. rsize, wsize 변경

2. MTU 사이즈 조절

3. timeo, retrans 값 조절

3. NFDS 개수 조절

   /etc/sysconfig/nfs   <-- centos

   /etc/init.d/nfs-kernel-server   <-- ubuntu

  RPCNFSDCOUNT = 8 (default 8)

4. Memory limit 조절

    # echo 65536 > /proc/sys/net/core/rmem_default

     # echo 65536 > /proc/sys/net/core/rmem_max

     /etc/sysctrl.conf

    net.core.rmem_max=219136

    net.core.wmem_max=219136

5. NIC autonegotiation OFF

6. sync VS async 

  -> async 시 데이타 corrupt 발생 가능성 있음

 *  참고 

  http://www.read.cs.ucla.edu/111/2007spring/notes/lec17