I have an old x86_64 computer which I am planning to use as a NAS. Which of the 2 is a better option? Is it helpful or better to run on bare metal or as a VM on proxmox?
Having faced the same situation, here’s my 2 cents:
OMV is the best solution for reusing/upcycling old consumer grade PC hardware. Your storage pool is easily expandable using MergerFS, you don’t need 16+ GB of RAM, and you certainly don’t need server-grade hardware. But you won’t have the bells and whistles the ZFS offers (yes, there is ZFS plugin, but at this point, why not just use TrueNAS?).
TrueNAS if you intend to build a “serious” storage server with many GB-s of ECC RAM, multi-Gbit networking and all that jazz. And if you have the budget to buy 5 or 6 large HDD-s at once to start out your storage pool with a single vdev using RAIDz1 or RAIDz2 (or buy 2 HDDs for a single mirrored vdev with a whopping 50% of all your current and future storage going to redundancy). As I understand it, ZFS expandability is in the works, but not production-ready yet—which makes ZFS less suitable for ad hoc grow-it-as-you-go storage solution.
In the end, OMV won it out for me, the 10TB motley crew of various HDD-s has served me well and I can expand cheaply when my needs grow.
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Having faced the same situation, here’s my 2 cents:
In the end, OMV won it out for me, the 10TB motley crew of various HDD-s has served me well and I can expand cheaply when my needs grow.