migrate VM / CPU compatibility

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spleenftw

Member
Oct 6, 2023
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Hello, im gonna change my proxmox host.
All of my VM does have "host" CPU as configuration, can i still simply backup > restore them to the new host without any issue ? (full debian vm)
 
While agreeing with bbgeek17, that most Linux VM's should be mostly forgiving to HW changes, I personally try to use on my VMs a Processors Type of x86-64-v2-AES when possible. This is usually good for any host HW changes & migration to other servers. YMMV.
 
We should differentiate between "backup/restore" and "live migration"
  • backup/restore should work with any CPU, including "host", at least for most OS ;-)
  • but live-migration (not asked for by @spleenftw) really needs the same CPU type as it copies register contents inside the CPU as part of the current "state". For this x86-64-v2-AES is simply a common (low) denominator
 
UdoB said:
We should differentiate between "backup/restore" and "live migration"
  • backup/restore should work with any CPU, including "host", at least for most OS ;-)
  • but live-migration (not asked for by @spleenftw) really needs the same CPU type as it copies register contents inside the CPU as part of the current "state". For this x86-64-v2-AES is simply a common (low) denominator
Click to expand...
I differentiate those two, that's why i didn't talked about live migration but simply migration (from one host to another, not in a cluster).
But i know that for a live migration it really needs the same CPU type !

Many thanks to everyone for your answers, i wish you all a great day
 
Generally, if you're moving VMs between hosts with similar hardware specs, you should be good to go with a backup and restore. Just make sure your new host's CPU supports all the features your VMs need.
 
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