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
