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The main question is: what exactly do you want to achieve? ZFS is a datacenter file system. Not exactly what I would expect for a single, external (USB attached?) disk. Where ZFS has a lot of strengths is the data consistency piece. You can do scrubs and even detect (silent) bit rod. But what...

I agree with you. If a manual start works well - This is the reason why I think it might be a timing issue. What settings have you used? To rule out the timing issue I'd use a very high value (5 min) and see if something changes. Does syslog show anything?

Have you changed the start on boot delay value? Host > System > Options > Start on boot delay For me the default works well. Perhaps you need a higher value?!

IMHO the biggest difference here is that the caches in the VM are controlled by the guest OS. So the guest OS is aware of it. ARC is on a different layer and may cache different things which make sense from the ZFS perspective. This can but does not necessarily be the same. Same applies to all...

Somehow that sounds like a timing issue to me. Some ideas: Have you configured a boot order? Is it set to "any"? Have you tried to flip the boot order around? Does the issue move to the other VM?

No. This is a completely different situation/beast. Make yourself familiar with how hypervisors work internally and how they do the scheduling. Also make sure you understand the difference between threads and real cores. This differs from CPU architecture to architecture as well. So do a...

I wouldn't do it. Threads are no cores. And in the end the hypervisor needs cycles as well. Ethernet, disk io. All that needs CPU. In the end you are better / faster with less cores most of the time, especially when you have multiple VMs. Scheduling overhead is not zero. If you want all CPUs...

Your PVE is x86 Raspberry is ARM Hence you need to emulate the CPU. Seems to be possible with qemu according to https://azeria-labs.com/emulate-raspberry-pi-with-qemu/ Have no experience so good luck ;)

Clearly a misunderstanding how virtualization and SMT works. 64 Cores per CPU and 128 Threads https://www.amd.com/de/products/cpu/amd-epyc-7742 Without numa it should be less than 64C (Threads are no cores). With numa I'd not assign more than 120C - but even that is questionable depending on...

Depends on which OS should be in it. Try booting a live system and repair the boot loader. Otherwise: hope you have a backup

I do understand your reasons behind the thought and still this is not how these systems (RAID, MDADM, ZFS) are designed. What you could do is to not autostart VMs, then issue a script that checks for health and starts the VMS if all is fine. But what then if a disk goes within operation? How...

Always use static references from these paths. /dev/sdx is only providing trouble. Also be aware that some devices like USB bridges don't provide unique device identifiers. So it makes sense to even double check those!

I could swear that the systems we have measured were v3 and ddr3 but you are right. Ark is the source of truth... However it seems there are ddr3 capable versions. https://www.servethehome.com/asrock-rack-releases-intel-xeon-e5-2600-v3-motherboards-ddr3/ Even more a reason to look very...

I'd orchestrate the shutdown from the 24/7 server. everything else will not bring you stable results. I am using since many years apcupsd which basically fires scripts. NUT should be able to do this as well. Process-wise I can see two options: Option 1: - check the connectivity to your Test-PVE...

Dont use suspend/resume for servers. This concept comes from windows clients. Everything server wise does not like it much, especially when an AD is involved. Time sync is critical, time jumps are not good/accepted. Kerberos for instance is very picky on time. Do proper guest is shutdowns in...

The v3 xeon uses ddr3, hence might be a lot more affordable. I don't have current prices in mind but when comparing v3/v4 back in the days one of the main differences was the used men technology. For average workloads (e.g. no heavy number crunching) I decided for myself that v4 was not worth it...

This seems like a weird idea to me. IMHO: If you want to run OSX purchase a MAC. Adding another layer of virtualization and the complexity involved does not really get you anywhere. And if the money is limiting you get a decent Linux distro which almost can look like a Mac. Elementary OS might...

Try the arcstat command and verify if your values do actually work as expected. I have had once issues that for whatever reason my values where not applied correctly on my first try. Aside that as mentioned by @leesteken there are other things that need memory.

Oct 23 02:03:53 proxmox03 kernel: [526080.349971] CPU 2/KVM invoked oom-killer: gfp_mask=0x1100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0 To me this reads as if the system ran out of memory. Have you limited ZFS arc usage? How much memory is in the system and how much memory is...

If you are using zfs it also by default uses up to 50% memory. Search for ARC limit usage. And don't forget that PVE itself also needs some memory