Re: Possibly wrong exit status for mdadm --misc --test

[Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>]

On Mon, 15 Jul 2024 07:59:36 +0300
Justinas Naruševičius <contact@junaru.com> wrote:

> Hello,
> 
> After reboot raid1 array with one failed drive is reported as degraded
> (failed drive reported as removed):
> 
> > root@rico ~ # mdadm --detail /dev/md127
> > /dev/md127:
> >            Version : 1.2
> >      Creation Time : Thu Feb 21 13:28:21 2019
> >         Raid Level : raid1
> >         Array Size : 57638912 (54.97 GiB 59.02 GB)
> >      Used Dev Size : 57638912 (54.97 GiB 59.02 GB)
> >       Raid Devices : 2
> >      Total Devices : 1
> >        Persistence : Superblock is persistent
> >
> >        Update Time : Mon Jul 15 07:25:12 2024
> >              State : clean, degraded
> >     Active Devices : 1
> >    Working Devices : 1
> >     Failed Devices : 0
> >      Spare Devices : 0
> >
> > Consistency Policy : resync
> >
> >               Name : sabretooth:root-raid1
> >               UUID : 1f1f3113:0b87a325:b9ad1414:0fe55600
> >             Events : 323644
> >
> >     Number   Major   Minor   RaidDevice State
> >        -       0        0        0      removed
> >        2       8        2        1      active sync   /dev/sda2  
> 
> 
> However testing such state with mdadm --misc --test returns 0
> 
> 
> > root@rico ~ # mdadm --misc --test /dev/md127
> > root@rico ~ # echo $?
> > 0
> > root@rico ~ #  
> 
> From man page:
> 
> > if the --test option is given, then the exit status
> >               will be:
> >               0      The array is functioning normally.
> >               1      The array has at least one failed device.
> >               2      The array has multiple failed devices such that it is
> > unusable. 4      There was an error while trying to get information about
> > the device.  
> 
> From --help output:
> 
> > root@rico ~ # mdadm --misc --help| grep test
> >   --test        -t   : exit status 0 if ok, 1 if degrade, 2 if dead, 4 if
> > missing  
> 
> Would expect the exit code to be 1.
> 
> Can anyone confirm this is expected behaviour?
> 
> > root@rico ~ # mdadm -V
> > mdadm - v4.3 - 2024-02-15
> > root@rico ~ #  
> 
> --
> 
> Regards,
> Justinas Naruševičius
> 

Hello,
This is old functionality but from what I can see it has sense if you are
sending Manage command like mdadm --remove. This --test command shouldn't
be used separately and that is why it is not working for you.

Thanks,
Mariusz