Minimizing SSD wear through PVE configuration changes

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ultima

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Apr 9, 2021
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I'm configuring my new ProxMox server and want to reduce unnecessary wear on my SSD root mirror. I've done a lot of searches and although it's easy enough to find some hints, I can't find a comprehensive tutorial to achieve this. What have a done so far:
  • redirected /var/log to a separate HDD
  • temporarily disabled the pve-ha-lrm and pve-ha-crm services
The context is a completely idle PVE server (no running VMs or containers). I have now reduced the amount of bytes written/day from 25.5 to 15.5 GB/day. This is still a significant amount for a server that's basically idling.

This begs the following questions:
  1. what is causing the 15.5GB written/day? Can I redirect part of this data to a HDD without a substantial impact on performance?
  2. what else can I do to reduce SSD wear?
And then there's this: my fast pool is a 2x1TB SSD mirror while my slow pool is a 2x14TB HDD mirror. The fast pool has the PVE root and VMs/containers. What would the performance impact be if I run PVE on the HDD pool and only use the SSDs for VMs/containers?

Your help will be much appreciated.
 
Not sure if it actually does anything, but I only run a single node, so I disable all the clustering stuff.

Code: 
systemctl stop pve-ha-lrm
systemctl stop pve-ha-crm
systemctl stop pvesr.timer
systemctl stop corosync.service
systemctl disable pve-ha-lrm
systemctl disable pve-ha-crm
systemctl disable pvesr.timer
systemctl disable corosync.service
 
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lmm5247 said:
Not sure if it actually does anything, but I only run a single node, so I disable all the clustering stuff.

Code: 
systemctl stop pve-ha-lrm
systemctl stop pve-ha-crm
systemctl stop pvesr.timer
systemctl stop corosync.service
systemctl disable pve-ha-lrm
systemctl disable pve-ha-crm
systemctl disable pvesr.timer
systemctl disable corosync.service
Click to expand...
Stopping the first 2 services has a very significant (positive re: logging) impact. However, rather than stopping the services I'd like to redirect the logging but can't figure out how to do this. I didn't know about the final 2 services and will look into that. Thanks anyway.
 
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