1x HP ProLiant N36L ( 2011 ) with 8GB RAM and 4x WD20EFRX in RAID6 and OpenMediaVault 3.0.99 ( No OS flash drive )
2x HP ProLiant Gen8 ( 2015 ) with 4GB RAM and 4x WD20EFRX in RAID6 and OpenMediaVault 3.0.99 ( No OS flash drive )
1x ASUS Vivo VM60 ( 2014 ) with 16GB RAM and 1x WD10EZRZ and OpenMediaVault 3.0.99 ( No OS flash drive )
1x Acer easyStore H340 ( 2009 ) with 2GB RAM and 2x Hitachi HDT722105 & 2x SAMSUNG HD502IJ in RAID6 and OpenMediaVault 4.1.11 ( No OS flash drive )
You read it right! None of my systems listed above holds any flash drive containing the OMV operating system!
And I didn't use a whole large drive just for the OS, either! It's a matter of partitioning the software RAID!