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(am-utils.info)/defaults with selectors

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`/defaults' with selectors
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   It is sometimes useful to have different defaults for a given map.
To achieve this, the `/defaults' entry must be able to process normal
selectors.  This feature is turned on by setting `selectors_in_defaults
= yes' in the `amd.conf' file.  Note: selectors_in_defaults Parameter.

   In this example, I set different default NFS mount options for hosts
which are running over a slower network link.  By setting a smaller size
for the NFS read and write buffer sizes, you can greatly improve remote
file service performance.

     /defaults \
       wire==slip-net;opts:=rw,intr,rsize=1024,wsize=1024,timeo=20,retrans=10 \
       wire!=slip-net;opts:=rw,intr