lets try it out i001 bcache

hosts/i001/hardware-configuration.nix

@@ -1,111 +1,33 @@
 # Do not modify this file!  It was generated by ‘nixos-generate-config’
 # and may be overwritten by future invocations.  Please make changes
 # to /etc/nixos/configuration.nix instead.
-{ config, lib, pkgs, modulesPath, ... }:
-let
-  NIXBOOT = "/dev/disk/by-uuid/641A-6BDB";
-  NIXROOT ="/dev/disk/by-uuid/ae94db42-ec46-4e2f-a98a-118359428a68"; 
-  cryptroot = "/dev/disk/by-uuid/49f11bf1-d4b7-4188-9203-4d7a42569afa";
-
-  USB_KEY = "/dev/disk/by-uuid/9985-EBD1";
-in
 {
-  imports =
-    [ (modulesPath + "/installer/scan/not-detected.nix")
-    ];
+  config,
+  lib,
+  pkgs,
+  modulesPath,
+  ...
+}:
 
-  boot.initrd.availableKernelModules = [ "xhci_pci" "ahci" "usb_storage" "usbhid" "sd_mod" "sdhci_pci" "ehci_pci" "uas" ];
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  boot.initrd.availableKernelModules = [
+    "xhci_pci"
+    "ahci"
+    "usb_storage"
+    "usbhid"
+    "sd_mod"
+    "sdhci_pci"
+    "ehci_pci"
+    "uas"
+  ];
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ "kvm-intel" ];
   boot.extraModulePackages = [ ];
 
-  fileSystems."/boot" =
-    { device = NIXBOOT;
-      fsType = "vfat";
-      options = [ "fmask=0077" "dmask=0077" ];
-    };
-
-  boot.initrd.luks.devices."cryptroot" = {
-    device = NIXROOT;
-
-    # Auto decrypt
-    keyFile = USB_KEY;
-    keyFileSize = 5000;
-    keyFileOffset = 5443;
-
-    tryEmptyPassphrase = true;
-    fallbackToPassword = true;
-    crypttabExtraOpts = [ "tries=2" ];
-  };
-
-  fileSystems."/" =
-    { device = cryptroot;
-      fsType = "btrfs";
-      options = [ "subvol=@root" "compress=zstd" ];
-    };
-
-  fileSystems."/nix" =
-    { device = cryptroot;
-      fsType = "btrfs";
-      options = [ "subvol=@nix" "compress=zstd" "noatime" ];
-    };
-
-  fileSystems."/persist" =
-    { device = cryptroot;
-      neededForBoot = true;
-      fsType = "btrfs";
-      options = [ "subvol=@persist" "compress=zstd" ];
-    };
-
-  fileSystems."/.swap" =
-    { device = cryptroot;
-      fsType = "btrfs";
-      options = [ "subvol=@swap" "noatime" ];
-    };
-
-  fileSystems."/.snapshots" =
-    { device = cryptroot;
-      fsType = "btrfs";
-      options = [ "subvol=@snapshots" "compress=zstd" "noatime"];
-    };
-
-  services.btrfs.autoScrub = {
-    enable = true;
-    # syntax as defined by https://www.freedesktop.org/software/systemd/man/systemd.time.html#Calendar%20Event s
-    interval = "monthly";
-    fileSystems = ["/"];
-  };
-
-  swapDevices = [{
-    device = "/.swap/swapfile"; 
-    size = 8*1024; # Creates an 8GB swap file 
-  }];
-
-  boot.initrd.postResumeCommands = lib.mkAfter ''
-    mkdir /btrfs_tmp
-    mount ${cryptroot} /btrfs_tmp
-    if [[ -e /btrfs_tmp/@root ]]; then
-        mkdir -p /btrfs_tmp/old_roots
-        timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/@root)" "+%Y-%m-%-d_%H:%M:%S")
-        mv /btrfs_tmp/@root "/btrfs_tmp/old_roots/$timestamp"
-    fi
-
-    delete_subvolume_recursively() {
-        IFS=$'\n'
-        for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
-            delete_subvolume_recursively "/btrfs_tmp/$i"
-        done
-        btrfs subvolume delete "$1"
-    }
-
-    for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
-        delete_subvolume_recursively "$i"
-    done
-
-    btrfs subvolume create /btrfs_tmp/@root
-    umount /btrfs_tmp
-  '';
-
   # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
   # (the default) this is the recommended approach. When using systemd-networkd it's
   # still possible to use this option, but it's recommended to use it in conjunction