Re: RFC: Project geom-events

Lev Serebryakov wrote this message on Wed, Oct 05, 2011 at 12:51 +0400:
> Hello, Andrey.
> You wrote 5 ??????? 2011 ?., 11:51:36:
> 
> > On 05.10.2011 10:39, Lev Serebryakov wrote:
> >>>    (1) Class and name of GEOM which is affected.
> >>>    (2) Name of provider which is affected.
> >>>    (3) Name of underlying provider which is lost (consumer from
> >>>        reporting GEOM's point of view).
> >>>    (4) Resulting state of affected provider (fixable, alive, dead).
> 
> > All except last could be get from the consumer in the orphan method.
>   I'm afraid, that (2) could not be known too in generic way, as GEOM
> could have several providers, and only part of them could be affected by
> disconnection. Consumer contains geom (with class) and underlying
> provider, it is items (1) and (3)...
> 
> >>   Other example -- geom_label creates and destroys about 10 labels on
> >> boot (on my test VM) and, if DESTROYED will be reported by very
> >> generic mechanism, it will end up with 10 e-mails to administrator on
> >> every boot -- I've got this, when put notifications in too generic
> >> place for first try.
> > Ok, good point. Can you explain how your script will distinguish which
> > actions are performed by administrator? Since change made by administrator
> > could trigger disappearing of several child geoms.
>   Not the script, but GEOMs themselves. They knows, why disk
>  disappears. Of course, it work only one-level -- if administrator
>  calls "gmirror remove gm0 ada4" geom_mirror knows, that ada4 is no
>  failed. Yes, I understand, that if here is configuration like this:
> 
>    gmirror0
>      gstripe0
>        ada0
>        ada1
>      gstripe1
>        ada2
>        ada3
> 
>   and administrator kills gstripe0, for example, geom_mirror will send
>  event, because from its point of view it is not administrative
>  action...
>   But such situations, IMHO, are not very often ones.

Won't gmirror still report COMPLETE after a gmirror remove?  So the
script can look at the gmirror device, and see that it is still
complete even though one of the providers were dropped and assume
it was an administrative command that did it..

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