RAM Upgrade on Proxmox Server

R

Raid007

Member
Feb 15, 2024
14
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Hey all,

I'm planning to upgrade my RAM from 128GB to 256GB on a Proxmox server.
The motherboard supports the upgrade, but are there any Proxmox-specific considerations I should be aware of?

Will the additional RAM be recognized immediately after installation and a reboot?

Thanks!
Raid007
 
LnxBil said:
No, unless you changed something yourself (e.g. limiting ZFS ARC)
Click to expand...

I am using a ZFS Pool but with the default settings (nothing changed so far). So currently 64 GB of 128 GB is used for caching. Will it grow to 128 GB/256 GB or stay at 64 GB. The size of the ZFS is "only" 8 TB so I would prefer if the size will stay to 64 GB.
 
Okay. Thank you!
Does anyone a good advice how much Cache for 8 TB ZFS Pool makes?

Is there anything else which could be a problem caused by the ram upgrade? Has anyone made bad experencices?
 
Raid007 said:
Does anyone a good advice how much Cache for 8 TB ZFS Pool makes?
Click to expand...
No, because "it depends". As always: the more cache the better ...


Raid007 said:
Is there anything else which could be a problem caused by the ram upgrade? Has anyone made bad experencices?
Click to expand...
There are some drawbacks:
  • Booting (BIOS post) will take more time
  • memory fragmentation can be worse
  • if memory modules are not properly aligned with channels, your system may be slower
  • if memory modules are not compatible enough, you may have slower memory speed
 
Okay - thank you!
The server is not really old and I will add the same memory, which is still on the market.

So best I can do is to try it out and hope for the best.
 
Raid007 said:
The server is not really old and I will add the same memory, which is still on the market.
Click to expand...
I just want to say: that does not mean that it works. If you e.g. occupy each slot and the memory is of the wrong rank type, it will not work. I had this in the past. It's not as easy as just plugging in/doubling stuff. Just keep that in mind.

Raid007 said:
So best I can do is to try it out and hope for the best.
Click to expand...
In the end ... yes ;)
 
LnxBil said:
In the end ... yes ;)
Click to expand...

Yes, that's exactly the problem. Anything unexpected can always happen. In the end, it's just a matter of trying and either everything works out or you go through hell. I'm hoping for the best and hopefully, you'll keep your fingers crossed for me ;)
 
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