Thanks for the informations. I give it a try monday and gave you a feedback.
2013/4/12 Felix Zachlod <[email protected]>: > Hello Joseph! > >> -----Ursprüngliche Nachricht-----, >> Von: Joseph-Andre Guaragna [mailto:[email protected]] >> Gesendet: Freitag, 12. April 2013 17:19 >> An: [email protected] >> 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: [email protected] > 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: [email protected] 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
