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nfs:server is not responding, still trying

问题描述:我使用目标机挂在nfs后,读写较大的文件就会出现server is not responding, still trying问题,google了一下,有人是这么解决的,如下

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在mini2440开发板上挂载主机上的nfs文件系统后传送较大文件时会出现下面的提示:

nfs:server is not responding, still trying
问题原因:
Mandag 27 november 2006 20:12 skrev Verner Kjrsgaard:
> Mandag 27 november 2006 19:33 skrev John P. New:
> > Verner,
> >
> > This is a problem with NFS and 2.6 kernels, fast server NICs and
> > comparatively slower client NICs. This will show up when the server has
> > a 1000Mb card and the client a 100Mb, or when the server has a 100Mb
> > card and the client a 10Mb.
> >
> > Essentially, you have to pass some options to the kernel on terminal
> > boot, and this varies depending on whether you are using etherboot or
> > PXE.
> >
> > See
> > http://wiki.ltsp.org/twiki/bin/view/Ltsp/NFS#NFS_Server_not_responding
> > for a deeper explanation of the problem and the cure. 

大意是说具有较高的传送速率的NFS主机网卡和较低速率的目标机网卡之间不匹配,要解决此问题需要在挂载文件系统时添加额外的参数。 

解决办法: 
1   当目标机启动后已经进入linux系统的情况下,使用以下mount命令:
mount -t nfs -o intr,nolock,rsize=1024,wsize=1024 59.70.245.216:/home/lizhao/rootfs  /mnt/nfs
(即添加了intr rsize=1024 wsize=1024 参数,参数的具体意义见下面注释)
2   当目标机处在引导阶段向内核传递命令行参数时,使用以下参数:
console=ttySAC0 root=/dev/nfs nfsroot=59.70.245.216:/home/lizhao/rootfs,flags=intr,rsize=1024,wsize=1024ip=59.70.245.222:59.70.245.216:59.70.245.216:255.255.255.0:leao:eth0:off           

参数解释: 
intr -- 当服务器宕机或者无法到达时,允许中断NFS请求。 nolock--禁用文件锁。 rsize = 8192 和 wsize=8192  -- 通过设定大的同时传输的数据块大小(bytes),以提高NFS读写的速度。改变这些值时要当心,一些旧的linux内核和网卡在大的块大小不能正常工作