NFS servers and ACCESS procedure

NFS servers and ACCESS procedure

[Jesse Colmenares]

Hello.

   
    I have  about 15(fifteen) Red Hat Linux 7.3 (kernel 2.4.18) Servers 
working as NFS clients against a  NetApp 840 Server running as NFS 
Server, the statistics of our server show about 60% of operations from 
the ACCESS procedure of NFS protocol.

    We are not concern about security because the aplications that 
access the network NFS server are running with only one user(root), so 
permission checking over the files is no necessary. We are using 
actually NFS version 3.

    The question is: There are a way no disable the ACCESS cheching on 
NFS version 3 clients o servers?

Thanks!!!



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Re: NFS servers and ACCESS procedure

[Trond Myklebust]

     >     The question is: There are a way no disable the ACCESS
     >     cheching on NFS version 3 clients o servers?

Not really. However there is a patch to make linux cache those ACCESS
checks in order to reduce the number of RPC calls. It has a very
noticable effect if you are running as root (for which the current
algorithm is very inefficient).

IOW: you have 3 obvious solutions.

  1) Use NFSv2...

  2) You could backport the ACCESS caching patch
        http://www.fys.uio.no/~trondmy/src/2.4.19/linux-2.4.19-21-access.dif
     to RedHat's 2.4.18 kernel.

  3) Upgrade to the RedHat 2.4.20 errata kernel, and apply the ACCESS
     caching patch for 2.4.20 to that.

Alternatively, RedHat may already have applied the ACCESS patch in
their rawhide kernels? Perhaps Steve Dickson could comment on that?

Cheers,
  Trond


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Re: NFS servers and ACCESS procedure

[Steve Dickson]

Trond Myklebust wrote:

>Alternatively, RedHat may already have applied the ACCESS patch in
>their rawhide kernels? Perhaps Steve Dickson could comment on that?
>
Yes.. the patch is in the latest rawhide kernel.

SteveD.



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