Hi, I'm looking for a method for doing RAID migration while keeping the data available. the migrations I'm interested with are: 1. Single drive ->RAID1/RAID5 2. RAID1 -> RAID5. the mdadm and kernel doesn't seem to provide built-in and crash-proof solution. but I found that RAID5 on 2 drives in degraded mode looks like a RAID1 (mirroring), and since linux supports RAID5 reshape, then I can use it to do the migration from RAID1 to RAID5 with 3 drives or more. - can I really assume that RAID 5 on 2 hdds (degraded mode) will function as raid 5? - how to build raid while keeping the contents of an existing drive available? saeed - 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