[stgt] [PATCH] scripts/tgt-setup-lun small improvements

[Alexander Nezhinsky]

> I meant that changing the format breaks the scripts so a patch that
> changes the format needs to update scripts.

I see. You referred just to tgt-setup-lun, which is unaffected by the changes.
I usually use tgt-setup-lun, and not tgt-admin, so i was unaware of
the dependencies.
I'll create a combined --show patch shortly.

> For example, we need the following fix for your backing store type
> patch.
>
> BTW, you use aio backing store? The patch is fine but I guess that
> everyone use the rdwr backing store.

I've rewritten the iser module (going to send the patches soon). One of the
features is a provision to batch the i/o commands when submitting them to
the execution, which is supposed to boost IOPS. I have experimented
with AIO as it supports multiple command submission. But I put AIO
in the example just as a way to show how you can use -b parameter.

Maybe i should give a few examples and state what are the defaults
(iscsi for -t, rdwr for -b)
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