Update. I've made another test. I've create md0 of 8GB and and md1 of 20 gb. After sync completed I've rebooted the machine. When I select partitioning on the installer I get only MDRAID of 500 GB and not partitioned size. > Hi list, > I'm new with UEFI and GPT. > For several years I've used MBR partition table. I've installed my > system on software raid1 (mdadm) using md0(sda1,sdb1) for swap, > md1(sda2, sdb2) for /, md2 (sda3,sdb3) for /home. From several how-to > concerning raid1 installation, I must put each partition on a different > md devices. I've asked times ago if it's more correct create the md > device, partitioning it and create fs on each partition created on md > device: > > mdadm create /dev/md0 ... > fdisk /dev/md0: > md0p1 swap > md0p2 / xfs > md0p3 /home xfs > > or create for each partition an md device and create the fs on mdX > device directly: > > mdadm create /dev/md[012]..... > mkfs.fs /dev/mdX (for each md device) > md0 swap > md1 / > md2 /home > > I got as answer that the second solution is the correct solution. > > I'm installing C7 1511 on a skylake machine with UEFI and I'm confused. > After googling, for my installation I must create gpt table, 1 partition > with fat32 type of 512M, and 2 partition for swap and / (I've excluded > /home), clone gpt partition table on second disk with sgdisk, create md > device for swap and /. > > I've created gpt partition table with: > > 1) part1 512m fat32 EFI-part > 2) part2 8gb raid swap > 3) part3 ~500gb raid / > > then I've cloned gpt of sda to sdb without problem. > > Then I've created array md0 for swap and md1 for / and then rebooted the > system. > > I've started installation process. > During disk selection I get only one disk tagged as MDRAID disk and not > sda and sdb. Selecting MDRAID disk I can't see sda1 sdb1 EFI-part, md0 > and md1 devices. > > Going to console, cat /proc/mdstat give me only md1. If I try to start > md0 mdadm says sda2: not such file or directory but the partition exists > on /dev/sda. > Coming back to Installer, it forces me to create partitions on MDRAID > (md1) disk and I create: > > md1p1 EFI > md1p2 swap > md1p3 / > > Installation was performed an system booted. > > Now, on this machine with mbr partition type I get md0 (sda1, sdb1) and > md1 (sda2, sdb2) > on uefi machine with gpt I get md1 (sda, sdb). > I've tried also installing with mbr before using gpt, and I got md0 > (sda1, sdb1), md1(sdb2, sda2) and the other 2 partition for EFI as > expected. But with mbr installer said me that It gpt was needed. > > Why using gpt, if I set two raid partition, create 2 raid, rebooting it > gives me that md1 has sda and sdb instead sda2 and sdb2 and other md is > dead? > > What is the correct method to install on RAID? 1 md device and create > partition on it or N md devices for N partition? > > Why using gpt I get only one disk on disk selection (mdraid device), not > the 2 physical disk, and not the 2 md raid created? > > Hope in help. > > Alessandro. > > >