[Linux-cluster] Last tuning on Quorum Disk / question

[Alain Moulle]

Hi Lon,

Finally, I adopt this quorum disk configuration :

<quorumd interval="1" label="QDISK0" min_score="1" tko="10" votes="1">
       <heuristic interval=2 tko="3" program="ping -t1 -c1 172.21.1.12" score=1/>
      <heuristic interval=2 program="ping -t3 -c1 172.21.1.12" score=1/>
</quorumd>


I just wonder if the interval values for quorum disk with regard to
the one for heuristic is the best choice or not ?

And which are the rules to fit the good value for interval and tko
on heuristic ? (I don't completely understand why your both heuristics
avoids suicide if one ping get lots, it seems to be due to tko value
but ... )


Thanks
Regards
And best whiches for 2008 ;-)

Alain Moullé

> Also - your heuristic should be more like one of the following:

>  <heuristic interval="2"
>             tko="3"
>             program="ping -t1 -c1 <another host>"
>             score="1"/>

>  <heuristic interval="2"
>             program="ping -t3 -c1 <another host>"
>             score="1"/>

>Reason: You don't want a single ICMP packet to determine node fitness.
>If that ping gets lost (network being full, or any reason really), the
>node will commit suicide.  (The man page probably needs updating about
>that!)
> Lon