On 2020-05-24 21:37, Patrick O'Callaghan wrote:
Still getting the hang of md. I had it working for several days (2
disks in RAID1 config) but after a system update and reboot, it

A system update or a system upgrade?

suddenly shows no data:

]# lsblk
NAME                            MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
[...]
sdd                               8:48   0 931.5G  0 disk
└─md127                           9:127  0 931.4G  0 raid1
   └─md127p1                     259:0    0 931.4G  0 part
sde                               8:64   0 931.5G  0 disk
└─md127                           9:127  0 931.4G  0 raid1
   └─md127p1                     259:0    0 931.4G  0 part

# mdadm --detail /dev/md127p1
/dev/md127p1:
            Version : 1.2
      Creation Time : Wed May 20 16:34:58 2020
         Raid Level : raid1
         Array Size : 976628736 (931.39 GiB 1000.07 GB)
      Used Dev Size : 976630464 (931.39 GiB 1000.07 GB)
       Raid Devices : 2
      Total Devices : 2
        Persistence : Superblock is persistent

      Intent Bitmap : Internal

        Update Time : Sun May 24 12:29:54 2020
              State : clean
     Active Devices : 2
    Working Devices : 2
     Failed Devices : 0
      Spare Devices : 0

Consistency Policy : bitmap

               Name : Bree:0  (local to host Bree)
               UUID : ba979f01:7f1dbe79:24f19f68:7ba6000c
             Events : 22436

     Number   Major   Minor   RaidDevice State
        0       8       48        0      active sync   /dev/sdd
        1       8       64        1      active sync   /dev/sde
# mount /dev/md127p1 /raid
# ls /raid

How is this possible? The only thing that touches the array is a borg
backup run from crontab, which I have verified is working correctly,
including just before the update and reboot this morning. It looks as
if the mount is mounting the wrong thing.

Or am I missing something very obvious?

poc

I would suggest that md is happy and the array is runnig (cat /proc/mdstat).

But I would check the logs to see if the 'mount' had anything to say.

--
Eyal at Home (fed...@eyal.emu.id.au)
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