RAID Level 1 and 5
First, RAID1 was implemented and it worked. Then the partitions sda6 and sda7 were deleted and sda6, sda7, and sda8 were created for a fresh implementation of RAID Level 5.
I stopped the existing RAID:
I have been told by my trainer that now I must create other partitions, sda9, sda10, sda11 for the new RAID because the previous one is creating the problem. I am trying that now, however, I want to know why we have to leave sda6 and sda7 even after deleting them.
Well, here is what I am trying now:
Did you remove the partitions from the array? ie:
mdadm --manage /dev/md0 --remove /dev/sda6
mdadm --manage /dev/md0 --remove /dev/sda7
Once that is done you should be able to assign them to the new Raid 5
I think you got the following:
Disk /dev/md0 doesn't contain a valid partition table
because the array is still configured, but the partitions were destroyed and recreated, so the md0 partition data no longer exists for the array.
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