May 5, 20233 yr Yesterday a VM needed more RAM. It looked like there were 4gb of unused RAM (cache) in my server, so I assigned most of it to the VM. As soon as I started the VM, the server was almost paralyzed by lots of writes on the HDD array, even if the VM is entirely on the SSD cache drives The server was very slow until I shut down the VM, I saw lots of iowait (the peak of user was caused by memory swapping inside the vm, before i added more memory) So I am wondering how can i avoid this, what's the limit to avoid overprovisioning the memory? And what's causing the writes? I installed iotop with the nerd tools, but it looked like the majority of writes were from "find /mnt/user/share -noleaf" 🤔
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