Re: Comments on Chapter 10 (I/O)

Jean-Pierre Prost (jpprost@watson.ibm.com)
Tue, 15 Apr 1997 10:51:32 -0400

> P216-L5-6: I cannot recall the initial definition of num_io_nodes. I
> thought it was the number of I/O devices that should be used to store
> the file (when io_node_list is not specified and when all I/O devices
> are kind of equivalent for the application). This number could be
> smaller than the number of I/O devices in the system. And I think we
> should also specify: "This hint is most relevant when the file is
created."

I have added "This hint is most relevant when the file is created",
although I believe this hint is most useful when retrieved (it returns
the number of I/O nodes in the system).

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According to me, the number returned is not necessarily the "number of I/O
nodes in the system", but it is the
"number of I/O nodes the file spans across". This number can be less than
the number of I/O nodes in the system,
even though in most cases, both numbers will be identical.
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> P227-L34: A figure showing what the end of the view represents would help

Agreed. Volunteers?

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Since I am the one requesting it, I will work on it. I will send Bill a
postscript file containing the new figure later today.
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Jean-Pierre