#performance
Every post tagged performance.
Blog posts
How to Enable ZFS Compression in Proxmox VE (lz4 vs zstd Explained)
ZFS compresses your VM disks by default in Proxmox VE, but lz4 isn't your only option. Learn how to check your real compression ratio and switch to zstd for better space savings.
How to Limit Migration and Backup Bandwidth in Proxmox VE (Stop It From Saturating Your Network)
Nightly backups and daytime migrations can max out a shared network link and slow down everything else. Here's how to set real bandwidth limits in Proxmox VE, from the datacenter-wide bwlimit dialog to per-job CLI overrides and the separate per-VM rate limit.
How to Use KSM (Kernel Samepage Merging) in Proxmox VE to Save RAM on Multiple VMs
KSM quietly deduplicates identical memory pages across similar VMs on a Proxmox VE host. Here's what it actually does, how to check if it's saving you RAM, and how to disable it node-wide or per VM.
How to Benchmark Your Proxmox VE Storage With fio (A Beginner's Guide to Testing Disk Performance)
Your Summary tab graphs won't tell you real IOPS or throughput. Here's how to install fio, run a random-write and a sequential-write test, and read the output without guessing what the numbers mean.
How to Enable Discard (TRIM) for VM Disks in Proxmox VE and Keep Your SSD Fast
Thin-provisioned VM disks in Proxmox VE don't shrink back down on their own, and SSDs do extra write work they don't need to. Here's how to turn on Discard and TRIM the right way.
How to Choose the Right Disk Bus Type for a VM in Proxmox VE (IDE vs SATA vs SCSI vs VirtIO)
IDE, SATA, SCSI, or VirtIO Block? Here's what each VM disk bus type actually does in Proxmox VE, why VirtIO SCSI single is the default since 7.3, and how to switch safely without a blue screen.
How to Read Proxmox VE's Built-In Performance Graphs (CPU, Memory, Network, and Disk Explained)
Every Proxmox VE node and VM has a Summary tab full of graphs: CPU, memory, network, disk I/O, and something called IO delay. Here's what each one actually measures, why the memory bar looks scary on ZFS, and how to read them like an admin instead of guessing.
How to Limit CPU Usage for a VM or LXC Container in Proxmox VE (cpulimit vs cpuunits Explained)
Learn the difference between cpulimit and cpuunits in Proxmox VE, and how to use each one to stop a single VM or LXC container from hogging your host's CPU.
How to Limit Disk I/O (Bandwidth and IOPS) for a Virtual Machine in Proxmox VE
One noisy VM can slow down every other guest on shared storage. Here is how to cap read/write speed and IOPS per disk in Proxmox VE, from the GUI and the qm command line.
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