RaidUpgrade2024

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See also [[Network/RaidArray]]

Requirements
============
*   10TB storage
*   current usage is 8.4TB

Options
=======
*   (2+2)x 6TB, 12TB raid 10 = 12TB
*   (2+4)x 6TB, 24TB raid 6
*   (2+4)x 6TB, 18TB raid 10
*   (2+2)x 6TB, 3x3TB raid 6

Resources
=========
*   [ZFS encryption vs ZFS+LUKS](https://raw.githubusercontent.com/jkool702/zfsEncryption_SpeedTest/main/ALL_RESULTS_SUMMARY)

Configurations
==============
*   H = Hot
*   P = Parity

Rebuild RAID6
-------------
*   (1H + 2P + 6) x 3TB = 12TB usable out of 33TB

RAID10
------
*   50% storage efficiency
*   vs raid6
    *   much faster resilver
    *   less load
    *   less risk of further failures
*   not guaranteed to survive 2 disk failures
    *   4 disks: 33% failure
    *   6 disks: 20% failure
    *   n disks: P(fail) = 1/n-1
*   each pair should be 1 old and 1 new 6TB drive

ZFS mirror vdev
---------------
*   LUKS on top requires guest FS (so, ext4 again...)
*   LUKS beneath requires individual encryption for each disk (blegh...)
*   can stripe across pairs of different sizes (e.g. 4x6TB, 2x3TB = 15TB usable)

Migration Strategy
==================
*   duplicate mount of md6-media at /mnt/media
*   migrate metadata and config
*   unmount md6-media and mount ia/media in its place
*   symlink /mnt/media as /mnt/md6-media
*   symlink /mnt/home as /mnt/md6-home
*   symlink /mnt/systems as /mnt/md6-media/systems

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