[Stgt-devel] [PATCH] in tgt-setup-lun: fix check if tgtd daemon is running

[FUJITA Tomonori]

On Mon, 07 Apr 2008 11:15:36 +0300
Doron Shoham <dorons at voltaire.com> wrote:

> FUJITA Tomonori wrote:
> >>> But the old script checks there are two tgtd daemons running. The new
> >>> one doesn't. Can you improve the new one to do that?
> >> Why tgtd has two daemons (process)?
> > 
> > One daemon does only logging and another (the main daemon) does the
> > rest. Two daemons use shared memory.
> > 
> > 
> >> When running tgtd with -f flag it has only one process,
> >> why is it?
> > 
> > It's just for debugging.
> > 
> > 
> >> So if I'll check for two process the script will exit.
> >>
> >>> Note that one of the two tgtd daemons could die due to a bug.
> >> When does it happen?
> > 
> > It happens when we put a bug to the main daemon.
> 
> For conclusion, we can check if there are two process
> running but then if some one use tgtd with -f flag the
> script will not work.

The current script doesn't work for the -f flag. I think that it's
fine since the -f flag is only for debugging. Common users don't use
it.

If you want, you can improve the script to check whether a tgt daemon
runs with the -f flag when the script finds only one tgt daemon, I
think.


> On the other hand, we can check if such process exists
> (without checking the amount of process).
> This way, the script will work on both cases but
> won't catch the bug on the main daemon (if exist).
> 
> Which solution should we use?
> 
> 
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