I can understand that. Attached is a debdiff of the updated package. I must stress that may not be the final form of the solution. I'm chatting with Douglas Gilbert (sg io maintainer) now about this. So far it appears that using an SD device as the target for sg io can have unintended side effects, like the ones we've been observing. If the corresponding SG device was used to begin with, this problem would have never occurred.
See for yourself, mpath_prio_netapp /dev/sg0 In the meanwhile, this patch adjusts the open flag s.t. the "side effect" no longer occurs. What's annoying is the upstream multipath (0.4.9) is still using SD devices for this work but they did change all of their open flags to O_RDONLY. Which leads me to believe they worked around this side effect too, perhaps unaware of the fact that they were causing these events to begin with by using sd devices by default. You can simply build the mpath_prio_netapp straight from path_priority/pp_netapp/ assuming build deps are met. ** Patch added: "preliminary patch, awaiting upstream feedback" https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/644489/+attachment/2174791/+files/adjust-prioritizer-open-flags-to-avoid-sg-io-side-effects.debdiff -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to multipath-tools in Ubuntu. https://bugs.launchpad.net/bugs/644489 Title: constantly changes /dev/disk/by-id/{scsi,wwn}-* LUN symlinks with multipathing To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/644489/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
