Re: can anyone explain this state?

[Peter Staubach <staubach@redhat.com>]

Michael wrote:

>
>Thanks for your feedback!
>
>Yes, I know it should be cache related, but you can see it took me
>more than 1 minute at the first time copy 100Mfile from nfs server,
>but suddenly the second time took 4 second.
>How can the cache result to this? NFS client cache ability? ok, if it
>is, that means NFS client could cache at least 90M data of 100M, then,
>how to explain the last 2 copies?  with rsize=8k,first time copy 100M
>file took 9 seconds, but the second time took 7 seconds, if cache work
>as great as rsize=1k, why not the second time copy take less than 1
>second?
>

The cache on the client can definitely account for the first two times.

As for the second two, I don't know.  Was the client, network, and server
otherwise completely quiescent?  What is the configuration of the client?
Can it safely cache 100MB without loosing any data because older data needed
to be pushed out to make room for newer data?  I expect so, but it would be
good to check.

What does the network traffic look like between the client and the server
during these cp commands?  That might tell you more about what is going on
in your environment.

    Thanx...

       ps


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