Fail to make RAID 6

Hi,

I made a RAID6 with 6 disk but it has mark as degraded (/dev/sda didn't syncro).
So I remove the RAID and check S.M.A.R.T. but all are green.
I tried to make the RAID again but with it make the following error:

Zitat

Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; omv-mkraid /dev/md0 -l raid6 -n 6 -N cluster /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf 2>&1' with exit code '1': mdadm: layout defaults to left-symmetricmdadm: layout defaults to left-symmetricmdadm: chunk size defaults to 512Kmdadm: size set to 2930135040Kmdadm: automatically enabling write-intent bitmap on large arraymdadm: Defaulting to version 1.2 metadatamdadm: Failed to write metadata to /dev/sda

Zitat

Erreur #0:exception 'OMV\ExecException' with message 'Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; omv-mkraid /dev/md0 -l raid6 -n 6 -N cluster /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf 2>&1' with exit code '1': mdadm: layout defaults to left-symmetricmdadm: layout defaults to left-symmetricmdadm: chunk size defaults to 512Kmdadm: size set to 2930135040Kmdadm: automatically enabling write-intent bitmap on large arraymdadm: Defaulting to version 1.2 metadatamdadm: Failed to write metadata to /dev/sda' in /usr/share/php/openmediavault/system/process.inc:174Stack trace:#0 /usr/share/openmediavault/engined/rpc/raidmgmt.inc(249): OMV\System\Process->execute()#1 [internal function]: OMVRpcServiceRaidMgmt->create(Array, Array)#2 /usr/share/php/openmediavault/rpc/serviceabstract.inc(124): call_user_func_array(Array, Array)#3 /usr/share/php/openmediavault/rpc/rpc.inc(84): OMV\Rpc\ServiceAbstract->callMethod('create', Array, Array)#4 /usr/sbin/omv-engined(516): OMV\Rpc\Rpc::call('RaidMgmt', 'create', Array, Array, 1)#5 {main}

I'm in 3.0.36.

I tried again, and it began o/. But once finished it said that there is only 4 disks this time...