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If app coder was sufficiently stubborn, it is not possible to hide from the app the fact it is currently running in virtual pc. This has been discussed many times on vmware/xen/kvm-lists, even here...

What fs are you using? If ZFS, use snapshot and send it somewhere...

This really made my day! :-)

So PVE is basically using "hybrid" system: Debian (which traditionally has older packages), with the newest Ubuntu kernel. Very strange approach...

Maybe some sort of compromise could be better. I do not see any reason to keep more than 2 older kernels (in addition to the latest one)...

That is sure clear you can not compare consumer-SSD with enterprise one. If nothing else, SM863 has power-loss protection (plus many other improvements). But you also have to pay more for it. On the other side, out of those consumer-SSDs, Samsung "Pro" series is the better one. But "Evo" is...

I can not find release-notes for 5.1-3 iso. What was changed (compared to 5.1-2)?

It seems to me the one you found it re-branded "Intel PRO/1000 PT, 2x 1000Base-T". Those are server-class single/dual/quad-port adapters, so it should be good. Sure better than the on-board one...

Not sure what ethernet-chip you have, but "e1000e" is one of the most buggy ethernet drivers I have ever seen. It caused even my ESXi-cluster to go to PSOD (kernel panic) over and over again. Finaly I got some PCIe/NIC and everything was ok. That's what I recommend to you: disable on-board...

...and because of this wisdom you decided to revive 5 years old topic. How smart!

P440ar is true hw-raid controller, and can not be used as dummy HBA, with just some simple sata-ports. Does not even support JBOD. So the only way installer can "see" your drives attached to P440ar is if you create array. If you do not want to use hw-raid, attach drives to on-board ports, or...

You can eliminate it (at least partially) by keeping enough free space for garbage collection. I have left ~20% unallocated, and i/o-speed seems to be not changing...

Despite of wiki saying so, I do not think p2v-migration is "quite easy". If nothing else, VM has different "hardware", for which your physical server might not have necessary drivers installed. For me it is much easier (and faster) to do clean OS install on VM, and migrate only data...

Not in case of ZFS on Linux

I personally recommend to install StorCLI too, and check periodically arrays/drives/controllers with it. Provides much more detailed output, than smartd...

Why do you keep swap, when you have plenty of RAM available? Honestly, I consider swap a thing of past, something of prehistoric computer age, when you had to pay a few thousand $ for 16MB RAM...

If you can not use pure-SSD setup anymore, it is better to let ZFS decide which data are frequently needed. So personally I'd use 2xSSD just for PVE + zlog + l2arc (+ swap, if you do not have enough RAM), and 4xHDD for everything else.

Drop hw-raid, and use zfs...

IMHO the best practice is to disable swap for both PVE-hosts and VMs/containers completely. For a few years one of the things I do on every PVE-host is "zfs destroy rpool/swap" (not just "swappiness 0"). Never had any problem. And when I'm talking about it, swap on ZFS is still not very stable...

Because PVE can not do proper backup of running VMs, just snapshot of its filesystem. If at the time of backup VM was running, you might (but do not have to) end with inconsistent backup. For some type of VMs this risk might be unacceptable (i.e. db-servers)... As much as I like PVE, some of my...