I have installed Debian with software RAID1 (and installed Proxmox on it) on 2 256GB SSD and I now want to move to 2 500GB SSD, how do I proceed?

Edit: the RAID is of the OS disks.

  • @xrun_detected@programming.dev
    2•8 months ago

    I’ve recently done this on one of my machines, these were the steps I as far as i remember:

    • backup!
    • add the new disks to the machine
    • partition them like the smaller disks
    • add the new disks to the array(s) (as members, not just spares)
    • take care of bootloader things while the raid is syncing
    • your raid should have 4 devices in sync now
    • fail and remove the smaller disks from the raid one by one
    • resize the partitions on the bigger disks to maximum
    • grow the MD raid to the new size

    If you use luks and/or lvm some additional steps will be needed to grow them as well.

    If your system can hotplug disks there’s a chance to pull this off with little to no downtime. :)