diff --git a/proxmox.md b/proxmox.md
index 389a9d2..9c21618 100644
--- a/proxmox.md
+++ b/proxmox.md
@@ -1,7 +1,18 @@
 ## Proxmox 
+
+### readonly kernel error nvme
+there are maybe three problems
+- C6 power states
+- iommu=soft kernel cmdline (https://bugzilla.kernel.org/show_bug.cgi?id=202665)
+- https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html?highlight=amd_iommu
+- it is maybe triggered by the fstrim command
+- APST https://unix.stackexchange.com/questions/612096/clarifying-nvme-apst-problems-for-linux => `nvme_core.default_ps_max_latency_us=0`
+
+  
 ### subscription nag screen
 https://johnscs.com/remove-proxmox51-subscription-notice/
 `sed -Ezi.bak "s/(Ext.Msg.show\(\{\s+title: gettext\('No valid sub)/void\(\{ \/\/\1/g" /usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.js && systemctl restart pveproxy.service`
+=> breaks update
 
 ### packages
 tmux, powertop,htop, cryptsetup,vim, cpu-frequ-utils
@@ -66,8 +77,9 @@ Devices:
     2   931.51GiB  /dev/sdb1
 ```
 5. create mounttarget folder and create fstab entry
-   ```
-     lsblk -o uuid,name
+
+```
+lsblk -o uuid,name
 UUID                                   NAME
                                        sda
 8d65854a-6be3-45de-81dd-cadbd9f49892   └─sda1
@@ -75,7 +87,8 @@ UUID                                   NAME
 8d65854a-6be3-45de-81dd-cadbd9f49892   └─sdb1
 
 UUID=8d65854a-6be3-45de-81dd-cadbd9f49892 /mnt/slowStorage btrfs defaults,rw 0 1
-   ```
+```
+
 6. Create under Rechenzentrum->Storage->Hinzufügen->BTRFS
 7. update templates: `pveam update`