nfs中的配置参数fsid=0,fsid=1,fsid=2分别是什么意思？

jun277

请教各位大侠，nfs中的配置参数fsid=0,fsid=1,fsid=2分别是什么意思？

q1208c

1. fsid=num|root|uuid
   
2.     NFS needs to be able to identify each filesystem that it exports. Normally it will use a UUID for the filesystem (if the filesystem has such a thing) or the device number of the device holding the filesystem (if the filesystem is stored on the device).
   
3. 
   
4.     As not all filesystems are stored on devices, and not all filesystems have UUIDs, it is sometimes necessary to explicitly tell NFS how to identify a filesystem. This is done with the fsid= option.
   
5. 
   
6.     For NFSv4, there is a distinguished filesystem which is the root of all exported filesystem. This is specified with fsid=root or fsid=0 both of which mean exactly the same thing.
   
7. 
   
8.     Other filesystems can be identified with a small integer, or a UUID which should contain 32 hex digits and arbitrary punctuation.
   
9. 
   
10.     Linux kernels version 2.6.20 and earlier do not understand the UUID setting so a small integer must be used if an fsid option needs to be set for such kernels. Setting both a small number and a UUID is supported so the same configuration can be made to work on old and new kernels alike.

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http://linux.die.net/man/5/exports

jun277

回复 2# q1208c
不太理解，仅仅是作为一个辨识符么？那
fsid=0,fsid=1,fsid=2有什么区别？又在那里显现？如果不设置和如何？

   

q1208c

回复 3# jun277

不设置的话, 可能会有一个默认值吧, 我现在手上没有 nfs server, 没法测试  
   

jun277

回复 4# q1208c
那我设置的fsid=0,fsid=1,fsid=2分别会有什么影响？


   

q1208c

回复 5# jun277

这个我回答不了你.