Cannot create filesystem with RAID

  • Hi,
    just have installed OMV on my gen8 microserver.
    I configured two similar HD in RAID_Stripe and then wanted to create a filesytem.
    I get a strange error:
    Error #0:OMV\ExecException: Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; mkfs -V -t ext4 -b 4096 -m 0 -E lazy_itable_init=0,lazy_journal_init=0 -O 64bit -L 'MyRaidFinal' '/dev/md0' 2>&1' with exit code '1': mke2fs 1.44.5 (15-Dec-2018)/dev/md0 is apparently in use by the system; will not make a filesystem here! in /usr/share/openmediavault/engined/rpc/filesystemmgmt.inc:642Stack trace:#0 /usr/share/php/openmediavault/rpc/serviceabstract.inc(536): OMVRpcServiceFileSystemMgmt->{closure}('/tmp/bgstatuswO...', '/tmp/bgoutputrE...')#1 /usr/share/openmediavault/engined/rpc/filesystemmgmt.inc(658): OMV\Rpc\ServiceAbstract->execBgProc(Object(Closure), NULL, Object(Closure))#2 [internal function]: OMVRpcServiceFileSystemMgmt->create(Array, Array)#3 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array)#4 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod('create', Array, Array)#5 /usr/sbin/omv-engined(536): OMV\Rpc\Rpc::call('FileSystemMgmt', 'create', Array, Array, 1)#6 {main}


    I have no share folders, the HD have just been wiped.
    Here is the result of a mdadm --detail /dev/md0



    And the result of a fdisk-l




    Any idea ??
    Thanks

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