What's the best way to convert Linux software RAID 1 array to RAID 5?   ( I have already bought the 3rd Hard Disc !)
Is their a 'friction free' way to convert RAID1 to RAID5?
storage;raid
Before doing anything of this sort back up your data to separate media and verify the backup via sha1sum.The process from there would look likeBreak the RAID1 mirroring so that one of the drives is freeAdd the third drive to your systemCreate a degraded RAID5 out of the new drive and the one freed from the RAID1Copy the data over to the RAID5 volumeAdd the RAID1 disk to the RAID5 volume, and give it plenty of time to synchronize itself properly.Verify that the data on the new volume matches the backupI've assumed that you're using Linux's software RAID support, in which case all of this would be managed by the mdadm command.