NFS - 客户端上的文件未出现在服务器上

Question

这是我的设置：一台 NFS 服务器机器，两台 NFS 客户端机器。

客户端机器将文件写入 NFS 挂载，但有时，这些文件不会出现在 NFS 服务器机器或其他客户端机器上.....

我对这个问题完全困惑不已...如能得到任何帮助我将非常感激！

Answer 1

不立即出现或一段时间不出现？

NFS 默认会在系统内核级别对目录和文件内容进行一定程度的缓存。如果计算机一更新了某个文件，而计算机二的缓存中仍有该文件的副本，那么如果计算机二尝试访问该文件，则可能在缓存过期之前无法看到该文件的较新版本。

检查 nfs 的手册页以了解以下参数：

   acregmin=n     The minimum time in seconds that attributes of a  regu-
                  lar  file  should  be  cached  before  requesting fresh
                  information from a server.  The default is 3 seconds.

   acregmax=n     The maximum time in seconds that attributes of a  regu-
                  lar file can be cached before requesting fresh informa-
                  tion from a server.  The default is 60 seconds.

   acdirmin=n     The minimum time in seconds that attributes of a direc-
                  tory  should be cached before requesting fresh informa-
                  tion from a server.  The default is 30 seconds.

   acdirmax=n     The maximum time in seconds that attributes of a direc-
                  tory  can be cached before requesting fresh information
                  from a server.  The default is 60 seconds.

   actimeo=n      Using actimeo sets all of acregmin, acregmax, acdirmin,
                  and  acdirmax  to  the same value.  There is no default
                  value.

   noac           Disable all forms of attribute caching entirely.   This
                  extracts  a  significant  performance  penalty  but  it
                  allows two different  NFS  clients  to  get  reasonable
                  results  when  both  clients  are actively writing to a
                  common export on the server.