Add pages for ansible and proxmox

ansible: testing playbooks + managing firewall rules with ufw
proxmox: disk performance w/ io_thread and scsi single + useful helper scripts
found online

1 files changed, 31 insertions, 0 deletions

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+# Disk performance
+
+Taken from https://forum.proxmox.com/threads/virtio-scsi-vs-virtio-scsi-single.28426/
+
+> VirtIO SCSI vs VirtIO SCSI Single boils down to a simple architectural choice that has real performance implications:
+>
+> Standard VirtIO SCSI uses one controller that handles up to 16 disks, while Single dedicates one controller per disk. This matters most when using IOThreads (iothread=1), because threads work at the controller level.
+>
+> When using IOThreads, Single shows significantly better performance (often 30-50% improvement) because each disk gets its own dedicated processing thread. Without IOThreads, the performance difference is minimal (typically less than 5%).
+>
+> So the choice is straightforward:
+>
+> >   Want maximum disk performance? Use Single + iothread=1
+> >   Managing lots of disks with limited resources? Standard might be better to avoid thread overhead
+> >   From the VM's perspective, they work exactly the same
+>
+> This explains why benchmarks consistently show better I/O performance with Single + iothread=1, while keeping the underlying architectural differences clear.
+
+Which results in the following packer configuration :
+
+```hcl
+   ...
+   # VM Hard Disk Settings
+   scsi_controller = "virtio-scsi-single"
+
+   disks {
+     ...
+     io_thread      = true
+   }
+   ...
+```