Web Server Documentation

Configuring RAID 1 (2/15/2016)

Sahil and I tried to configure RAID 10 using the software RAID option in the installer, which is documented here. We put two 64 GB swap space partitions on the first two hard drives, and created two ext4 partitions that took up the rest of the space on those two drives. For the other two drives, we used a single ext4 partition for each drive. For all of the ext4 partitions, we set the bootable flag to "on." Then we chose to configure the software RAID, created a new MD device, and chose RAID10 with 2 active devices and 2 spare devices. For the active devices, we chose the two ext4 partitions on the first two hard drives, and for the spare devices, we chose the two ext4 partitions on the other two hard drives. But then the installation process fails when the GRUB boot loader can't be installed, because the GUID partition tables (GPT) need a designated, small (1 MB is enough) partition for the GRUB bootloader.

So we started partitioning from scratch, but with only two hard drives for a RAID1 array. In the first drive, there are three partitions: one 1 MB partition reserved for the bootloader, one 64 GB swap partition, and the rest of the drive as an ext4 partition for the filesystem. In the second drive, there are two partitions: one 1 MB partition reserved for the bootloader and the rest of the drive as an ext4 partition for the filesystem. Then we made two software RAID devices, both with one with 2 active devices and 0 spare devices. The first RAID device had both of the bootloader partitions as the active devices, and the second RAID device had both of the ext4 filesystem partitions as the active devices. Then we set the first RAID device to "use as ext4" and the mount as "/boot" and the second RAID device as "use as ext4" and the mount as "/" and then continued with the installation. This time, it failed to install the kernel.