[CentOS] [Solved] Excessive NFS operations

Les Mikesell lesmikesell at gmail.com
Fri Oct 2 20:15:21 UTC 2009


Robert Heller wrote:
> 
>> Seems odd that caching wouldn't just happen naturally in the nfs client. 
> 
> I am not sure if it even makes sense to cache NFS files on a nfs client
> -- how does the client know that the file might not have changed on the
> server?  At the very least it has to check the file mod times on the
> server to be sure its local cache is valid.

Pretty much all filesytems cache, and would be unusably slow if they 
didn't.  File attributes should be only a few seconds on NFS, but that 
should be enough to avoid killing your server.

>>   Maybe it is updating the access time on each read or something that 
>> causes the activity.
> 
> It is either re-reading the files or checking mod times to determin
> if the local cached copy is valid. Either way, lots of traffic.

And this was hundreds of ops/second?

-- 
   Les Mikesell
    lesmikesell at gmail.com


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