[Bug 497186] Re: initramfs' init-premount degrades *all* arrays (not just those required to boot)
Hi Dustin, I am not a developer and don't know how to create packages etc. Though, I have gathered information from using mdadm and bugreports to make it easier for a developer to bring ubuntu's mdadm setup in shape. -- initramfs' init-premount degrades *all* arrays (not just those required to boot) https://bugs.launchpad.net/bugs/497186 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 497186] Re: initramfs' init-premount degrades *all* arrays (not just those required to boot)
@ceg- I read through https://wiki.ubuntu.com/ReliableRaid, and it looks pretty good. Are you willing to implement this for Maverick? -- initramfs' init-premount degrades *all* arrays (not just those required to boot) https://bugs.launchpad.net/bugs/497186 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 497186] Re: initramfs' init-premount degrades *all* arrays (not just those required to boot)
** Description changed: After a timeout mdadm in initrams degrades all arrays instead of just those required for the rootfs. This is not good since non-rootfs arrays are likely to be available only incompletely (due to the early stage during boot) and are getting desynced by this. When creating the initramfs image the mdadm hook should determine the dependencies of the rootfilesystem and save a list of the required md devices in the initramfs. + See: How would you decide what device is needed? at + https://wiki.ubuntu.com/ReliableRaid + Currently the initramfs boot script just looks for *any* available - incomplete array and calls mdadm --assemble --scan --run, which starts - all runnable arrays. + incomplete array and calls mdadm --assemble --scan --run, which will + start *all* runnable arrays. - -- - The best way to fix the so many mdadm bugs is probably to adopt the event driven upstart/mountall init within intiramfs. - Bug #491463 upstart init within initramfs + --- + comment #2 contains a workaround for the proper command to run single arrays degraded. -- initramfs' init-premount degrades *all* arrays (not just those required to boot) https://bugs.launchpad.net/bugs/497186 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 497186] Re: initramfs' init-premount degrades *all* arrays (not just those required to boot)
Note that with the UUID-based raid assembly https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/158918/comments/33 the mdadm.conf file is not used to store ARRAY definitions any more. Thus the (UUID) list of raid devices required to mount the rootfs must be stored in a separate file within initramfs. -- initramfs' init-premount degrades *all* arrays (not just those required to boot) https://bugs.launchpad.net/bugs/497186 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 497186] Re: initramfs' init-premount degrades *all* arrays (not just those required to boot)
** Summary changed: - initramfs' mdadm degrades all arrays (not just those required to boot) + initramfs' init-premount degrades *all* arrays (not just those required to boot) -- initramfs' init-premount degrades *all* arrays (not just those required to boot) https://bugs.launchpad.net/bugs/497186 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 497186] Re: initramfs' init-premount degrades *all* arrays (not just those required to boot)
As long as the proper mdadm --incremental mode command (to start a single array) is not available (Bug #251646) a workaround needs to be used: mdadm --remove incomplete-md-device arbitrary-member-device-of- incomplete-array mdadm --incremental --run arbitrary-member-device-of-incomplete-array ** Description changed: - Binary package hint: mdadm - - after a timeout mdadm in initrams degrades all arrays instead of just + After a timeout mdadm in initrams degrades all arrays instead of just those required for the rootfs. - The dependencies are not checked and saved to initramfs. Instead the script just looks into /proc/mdstat and uses mdadm --assemble --scan --run starting all arrays, if some arrays are incomplete (very likely during initramfs state). - (Additionaly a legacy non-hotplug command.) + This is not good since non-rootfs arrays are likely to be available only + incompletely (due to the early stage during boot) and are getting + desynced by this. - The best way to fix the so many mdadm bugs is probably to adopt the - event driven upstart/mountall init within intiramfs. + When creating the initramfs image the mdadm hook should determine the + dependencies of the rootfilesystem and save a list of the required md + devices in the initramfs. - See https://wiki.ubuntu.com/ReliableRaid + Currently the initramfs boot script just looks for *any* available + incomplete array and calls mdadm --assemble --scan --run, which starts + all runnable arrays. + + -- + The best way to fix the so many mdadm bugs is probably to adopt the event driven upstart/mountall init within intiramfs. + Bug #491463 upstart init within initramfs -- initramfs' init-premount degrades *all* arrays (not just those required to boot) https://bugs.launchpad.net/bugs/497186 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 497186] Re: initramfs' init-premount degrades *all* arrays (not just those required to boot)
** Changed in: mdadm (Ubuntu) Status: New = Confirmed -- initramfs' init-premount degrades *all* arrays (not just those required to boot) https://bugs.launchpad.net/bugs/497186 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
