Hi Lars,
thank you very much for the deep explanation.
Regards,
Alberto
On 09/10/2012 03:42 PM, Lars Marowsky-Bree wrote:
On 2012-09-10T14:40:43, Alberto Menichetti<albmeniche...@tai.it> wrote:
Sorry, maybe I'm missing something, but suppose this scenario (also
remember that, being a 2-node cluster, I had to set
no-quorum-policy="ignore"):
1. the virtual center is unavailable
2. an event occurs that partition the cluster
3. at this point, both the nodes could try to start a filesystem
resource, thus compromising the data safety.
Because of 1, the nodes cannot fence, but will not start resources
without a successful fence completion.
Hence, in the case of a network partition with unavailable fencing setup
and no-quorum-policy=ignore, resources will continue to run where they
were running before the partition. (Which is the best one could hope for
anyway.)
If there's a real outage of one of the nodes, *and* the vcenter is down,
then the surviving node won't take over because it can't fence. That
leaves your data intact and the service down.
Regards,
Lars
--
TAI S.r.l.
Alberto Menichetti
Area Mercato - Ingegneria dei Sistemi
System Engineer
50141 Firenze - Via Pazzagli, 2
Voice: +39 055 42661 - Fax +39 055 4266356
56125 Pisa - Viale Gramsci, 12
Voice: +39 050 220221 - Fax: +39 050 24421
e-mail: alb.meniche...@tai.it
http://www.tai.it
-----------------------------------------------------------------------
COMUNICAZIONE AI SENSI LEGGE 196/03
Il presente messaggio di posta elettronica viene inviato al Vostro indirizzo
email, che abbiamo acquisito da Vostre Visite, da incontri commerciali, elenchi
di pubblico dominio, Vostre precedenti comunicazioni. Il Vostro dato in
questione e' in possesso di TAI S.r.l., che lo ha immagazzinato in formato
elettronico. Tali informazioni non saranno divulgate a terzi. Se desiderate
verificare, cancellare o modificare i dati in nostro possesso, inviate fax al
numero 0554266356.
_______________________________________________
Pacemaker mailing list: Pacemaker@oss.clusterlabs.org
http://oss.clusterlabs.org/mailman/listinfo/pacemaker
Project Home: http://www.clusterlabs.org
Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
Bugs: http://bugs.clusterlabs.org