Hello together For a long time now (surely since the beginning of 2018) I have the problem that every now and then after a reboot of the system (PC workstation) the RAID-1 is resynchronized. Possibly the problem occurs mostly or always after an kernel update kernel, but there are cases (like today) where no update was made. The RAID-1 consisting of 2x 2TB SATA HDD The RAID is built with mdadm, at the earlier days with header version 0.x, but also completely rebuilt (because of this problem) with header version 1.2 The Linux system is a Debian "testing" (version 10.0) Current kernel version: 4.19.0-5-amd64 #1 SMP Debian 4.19.37-3 (2019-05-15) x86_64 GNU/Linux But the problem was already at version: 4.17.0-1-amd64 #1 SMP Debian 4.17.8-1 (2018-07-20) x86_64 GNU/Linux The log entry in kern.log (after restart) when the RAID needs to be resynchronized: > Jun 14 23:11:01 $hostname kernel: [ 2.132085] md/raid1:md0: not clean -- starting background reconstruction > Jun 14 23:11:01 $hostname kernel: [ 2.132088] md/raid1:md0: active with 2 out of 2 mirrors > Jun 14 23:11:01 $hostname kernel: [ 2.132245] md0: bitmap file is out of date (228834 < 228835) -- forcing full recovery > Jun 14 23:11:01 $hostname kernel: [ 2.132297] md0: bitmap file is out of date, doing full recovery The new synchronization will look like this (today): > $ cat /proc/mdstat > Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] > md0 : active raid1 sdb1[0] sdc1[3] > 1953382464 blocks super 1.2 [2/2] [UU] > [=====>...............] resync = 25.7% (502785344/1953382464) finish=216.8min speed=111498K/sec > bitmap: 13/15 pages [52KB], 65536KB chunk > > unused devices: <none> I suspected once that something would not stop correctly before shutting down, but how could you debug something like that? I already tried to replug all SATA cables - without success. In the meantime even a new mainboard/CPU/RAM is installed and one of the two SATA 2TB disks is replaced by a new one. But the the problem remained :-/ While searching the internet I found a partially similar problem [1] but without an solution. Does anyone have any idea how I could narrow down or fix the problem? Thanks a lot! [1] https://www.spinics.net/lists/raid/msg47475.html -- kind regards mathias
