** Bug watch added: Debian Bug tracker #943520 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=943520
** Also affects: mdadm (Debian) via https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=943520 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of STS Sponsors, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1847924 Title: Introduce broken state parsing to mdadm Status in mdadm package in Ubuntu: In Progress Status in mdadm source package in Bionic: In Progress Status in mdadm source package in Disco: In Progress Status in mdadm source package in Eoan: In Progress Status in mdadm source package in Focal: In Progress Status in mdadm package in Debian: Unknown Bug description: [Impact] * Currently, mounted raid0/md-linear arrays have no indication/warning when one or more members are removed or suffer from some non- recoverable error condition. The mdadm tool shows "clean" state regardless if a member was removed. * The patch proposed in this SRU addresses this issue by introducing a new state "broken", which is analog to "clean" but indicates that array is not in a good/correct state. The commit, available upstream as 43ebc910 ("mdadm: Introduce new array state 'broken' for raid0/linear") [0], was extensively discussed and received a good amount of reviews/analysis by both the current mdadm maintainer as well as an old maintainer. * One important note here is that this patch requires a counter-part in the kernel to be fully functional, which was SRUed in LP: #1847773. It works fine/transparently without this kernel counter-part though. [Test case] * To test this patch, create a raid0 or linear md array on Linux using mdadm, like: "mdadm --create md0 --level=0 --raid-devices=2 /dev/nvme0n1 /dev/nvme1n1"; * Format the array using a FS of your choice (for example ext4) and mount the array; * Remove one member of the array, for example using sysfs interface (for nvme: echo 1 > /sys/block/nvme0n1/device/device/remove, for scsi: echo 1 > /sys/block/sdX/device/delete); * Without this patch, the array state shown by "mdadm --detail" is "clean", regardless a member is missing/failed. [Regression potential] * There's not much potential regression here; we just exhibit arrays' state as "broken" if they have one or more missing/failed members; we believe the most common "issue" that could be reported from this patch is if an userspace tool rely on the array status as being always "clean" even for broken devices, then such tool may behave differently with this patch. * Note that we *proactively* skipped Xenial SRU here, in order to prevent potential regressions - Xenial mdadm tool lacks code infrastructure used by this patch, so the decision was for safety/stability, by only SRUing Bionic / Disco / Eoan mdadm versions. [0] https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/commit/?id=43ebc910 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1847924/+subscriptions -- Mailing list: https://launchpad.net/~sts-sponsors Post to : [email protected] Unsubscribe : https://launchpad.net/~sts-sponsors More help : https://help.launchpad.net/ListHelp
