topic Re: Help with next ioscan -F scriptable syntax (with new feature) in Operating System - HP-UX

Help with next ioscan -F scriptable syntax (with new feature)

marie-noelle jeanson_1 — Fri, 07 Jul 2006 11:11:08 GMT

Hi,

I have a scripting question. In ioscan, we use -F to display all the fields of an entry in a compacted way. Today, the dsf names are listed in the next lines (with a dsf char and block names on the same line).
I a future release, we will introduce an option to add multiple paths to a LUN to this output.
In terms of scripting usability, is it ok to display this (each entry is on several lines):
< class >:< instance >....< description>
....
< char dsf name1>
< char dsf name2>

Any better suggestion?
Note: We do not want to break backward compatibility of what exists today, so we have to keep the dsf names as they are today.

Thanks,

Marie.

Re: Help with next ioscan -F scriptable syntax (with new feature)

Bill Hassell — Fri, 07 Jul 2006 22:52:03 GMT

The -F option is designed for scripting by placing all the details on one line. Since devicefiles are always listed on the next line, I don't see a problem with multiple lines to handle multiple paths to devices. I am assuming that a new option will be created to display the multiple paths.

Re: Help with next ioscan -F scriptable syntax (with new feature)

A. Clay Stephenson — Sat, 08 Jul 2006 00:05:14 GMT

As long as the -F format (w/o this addional flag) stays the same I don't see any problem with your proposal; however, once your new option goes into effect resist all other impulses to "improve" the format because that will break scripts. You might consider adding leading pad character(s) to the lun path line to make it easy to decide if this line is the lun line. For example, if the line begins with "#" then it's trivially easy to test in the shell, awk, sed, or Perl.

Re: Help with next ioscan -F scriptable syntax (with new feature)

marie-noelle jeanson_1 — Sat, 08 Jul 2006 10:27:59 GMT

Thanks for your replies. We are not changing the output in existing option, this requires a new option to be used. And the reason why we are seeking input now is to avoid to make changes after it is released. If this is a brand new option, then we couls also display a symbol before the list of dsfs, right?
Like:
<........> first line of data
DSF ...
LP ...

Would that work?

Thanks,

Marie.

Re: Help with next ioscan -F scriptable syntax (with new feature)

A. Clay Stephenson — Sat, 08 Jul 2006 18:37:05 GMT

Yes, that should work but just make certain that you choose tags that could never be found in the first field of the : ... line

e.g
"#LP#"
rather than simply "LP"
you might also consider separating each LUN and each dsf name group with rather than space -- that too would make scripting safer and easier but above all, the key to good scripting is that the documentation accurately reflect the output in all cases.