Hi, I bought a 32GB Intel Optane NVMe and would like to add it to an existing RAID5 array as the journal device. My hope was that with the latest Loonix kernel 4.12.4 and mdadm 4.0 adding a log device to an already existing array should work. It didn't. :( Though I marked the R5 array as RO, mdadm complained that adding a journal to that particular array is not possible because it didn't have had a journal device in teh past. Unfortunately it is not possible for me to recreate the array, as that would imply to move all data to backup, delete and recreate the array and afterwards move it back. When is it planned for mdadm/md-raid?.c to add/remove journal devices on the fly (assuming they array may not be currently in use, e.g. --readonly)? Kind regards, Vasco -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
