Hi Felix, Sorry for the late answer. I gave a try to your suggestions, it worked immediately with block io and the increase block timeout.
I stick with iet for now as my supervisor want to stick to standard pacakges. You really save my day. Best reagards, Joseph-André GUARAGNA 2013/4/14 Joseph-Andre Guaragna <joseph-an...@rdmo.com> > > Thanks for the informations. I give it a try monday and gave you a feedback. > > > > 2013/4/12 Felix Zachlod <fz.li...@sis-gmbh.info>: > > Hello Joseph! > > > >> -----Ursprüngliche Nachricht-----, > >> Von: Joseph-Andre Guaragna [mailto:joseph-an...@rdmo.com] > >> Gesendet: Freitag, 12. April 2013 17:19 > >> An: pacemaker@oss.clusterlabs.org > >> Betreff: [Pacemaker] iscsi target mounting readonly on client > > > > You have to make two things absolutely shure. > > > > 1. Data that has been acknowledged by you iscsi Target to your initiator has > > hit the device and not only the page cache! > > > > If you run your target in fileio mode you have to use write trough- cause > > with write back you or your cluster manager can't ever tell if the writes > > have completed before switching the DRBD states. > > That will only perform good if you have a decent raid card with BBWC! BUT > > YOU MUST RUN WRITE TRHOUGH or blockio (which will be write trough too) > > running write back in such a constellation IS NOT SAFE you might risk > > SERIOUS DATA CORRUPTION when switching targets. > > > > 2. On your initiator side try to rise the /sys/block/sd*/device/timeout > > value. That is the time the block device will wait for a command to complete > > before handing an i/o error tot he upper layer- which will most probably > > lead to your filesystem remounting r/o. > > > > 3. This is just a side note: do not use iet. We were running a production > > target wit iet for about 2 year which caused horrible problems to us. > > Consider scst or lio (I personally do not have any experiences with lio but > > scst is running in our production environment for years now without any > > problems) > > > > regards > > Felix > > > > > > _______________________________________________ > > 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 _______________________________________________ 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
