Update RHEL9 docs only to 2.15.6

azure-managed-lustre/client-install.md

@@ -213,7 +213,7 @@ The instructions apply to client VMs running:
 
     The metapackage version doesn't always align with the kernel version. You can use the following command to install the proper metapackage:
 
-   [!INCLUDE [client-install-version-rhel-8-9](./includes/client-install-version-rhel-8-9.md)]
+   [!INCLUDE [client-install-version-rhel-8](./includes/client-install-version-rhel-8.md)]
 
 ::: zone-end
 
@@ -248,7 +248,7 @@ The instructions apply to client VMs running:
 
    The metapackage version doesn't always align with the kernel version. You can use the following command to install the proper metapackage:
 
-   [!INCLUDE [client-install-version-rhel-8-9](./includes/client-install-version-rhel-8-9.md)]
+   [!INCLUDE [client-install-version-rhel-9](./includes/client-install-version-rhel-9.md)]
 
 ::: zone-end
 

azure-managed-lustre/includes/client-install-version-rhel-9.md

@@ -0,0 +1,23 @@
+---
+author: pauljewellmsft
+ms.author: pauljewell
+ms.service: azure-stack
+ms.topic: include
+ms.date: 10/18/2024
+ms.reviewer: dsundarraj
+ms.lastreviewed: 10/18/2024
+---
+
+```bash
+sudo dnf install amlfs-lustre-client-2.15.6_39_g3e00a10-$(uname -r | sed -e "s/\.$(uname -p)$//" | sed -re 's/[-_]/\./g')-1
+```
+
+> [!NOTE]
+> Running `dnf search amlfs-lustre-client` doesn't show all available packages for your distro. To see all available `amlfs-lustre-client` packages, run `dnf list --showduplicates "amlfs-lustre-client*"`.
+
+If you want to upgrade *only* the kernel and not all packages, you must, at minimum, also upgrade the **amlfs-lustre-client** metapackage in order for the Lustre client to continue to work after the reboot. The command should look similar to the following example:
+
+```bash
+export NEWKERNELVERSION=6.7.8
+sudo dnf upgrade kernel-$NEWKERNELVERSION amlfs-lustre-client-2.15.6_39_g3e00a10-$(echo $NEWKERNELVERSION | sed -e "s/\.$(uname -p)$//" | sed -re 's/[-_]/\./g')-1
+```