Lvm volumes can be created on both software raid partitions and standard partitions residing on a single disk. But theres a problem the pvcreate command is a little broken. I did not use lvm since i didnt really feel the need to add yet another layer of. To create a raid1 array on our already running system, we must prepare the devsdb. Since this is not a supported configuration in ubuntu desktop, i had. Raid 1, basically means that the data is mirrored on multiple disks. The raid 1 array type is implemented by mirroring data across all available disks. This gives you complete redundancy with your data as long. Many tutorials treat the swap space differently, either by creating a separate raid1 array or a lvm logical.
Your raid 0 array should now automatically be assembled and mounted each boot. The raid software included with current versions of linux and ubuntu is based on the mdadm driver and works very well, better even than many socalled hardware raid controllers. The most important tool for setting up raid is mdadm. If it not a highend one it is usally worse than linux sw raid aka mdadm. Lvm logical volume manager is a tool to dynamically manage partitions. Ubuntu server edition using two raid1 partitions on two physical hard drives.
Each disk in a raid 1 array gets a full copy of the data, providing redundancy in the event of a device failure. Raid 1 mirrors data across all disks in its array, meaning each block of data is written to each disk. How to set up software raid1 on a running lvm system. This guide explains how to set up software raid1 on an already running lvm system ubuntu 19. Clone efi partition from installed partition to the other drive. Select create md device, type raid1, 2 active disks, 0 spare disks, and select the devsda2. So it is a tool to get fault tolerance in case of a hard drive crash and some better availability since you have the option of continuing to run the system with just the remaining disk. To avoid a lengthy wait during boot in case a drive breaks, remove the btrfs boot scripts. Thats the raid 1 bit of the setup taken care of so this is the point at which we get lvm to create a nice big partition out of the first two disks. The particular linux distribution used is archlinux.
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