Improved RAID documentation

coreos / fedora-coreos-docs

Documentation for Fedora CoreOS

https://docs.fedoraproject.org/en-US/fedora-coreos/

Other

50 stars 121 forks source link

Improved RAID documentation #232

Closed kanadaj closed 3 years ago

kanadaj commented 3 years ago

Describe the enhancement I'm trying to set up nodes with a pair of drives so that / and /var are on separate raid partitions on the same pair of drives, but there is a serious lack of documentation around RAID setups.

System details

Bare Metal
Fedora CoreOS version

Additional information I've tried to either create a full-disk raid array and then partition that (which doesn't seem to work - I'm guessing partitioning has to run first?) and partitioning the disks with 2 partitions (first starts at 5000 with a size_mib of 100k, the second starts at 0 and size of 0) and then turn those into arrays but it seems to crash the system during ignition either way.

Some working examples or explicitly saying if it's not supported would be welcome.

kanadaj commented 3 years ago

Ooops, wrong repo...

bgilbert commented 3 years ago

Note that RAIDing the root filesystem isn't sufficient for a successful boot after a drive failure, because there's also /boot, the ESP (if on UEFI), and the bootloader (if on BIOS). The current FCOS testing release supports full-disk RAID via the FCC boot_device.mirror section; see here. The second example is close to what you're looking for.

This functionality will be available in FCOS stable in the next release. We plan to add more FCOS documentation soon.