Merge pull request #108347 from msaenzbosupport/patch-2

[Doc-A-Thon] Updating code block and sudo

Author: Court72

articles/virtual-machines/hb-hc-known-issues.md

@@ -42,7 +42,7 @@ InfiniBand can be configured on the SR-IOV enabled VM sizes with the OFED driver
 ## Duplicate MAC with cloud-init with Ubuntu on H-series and N-series VMs
 
 There's a known issue with cloud-init on Ubuntu VM images as it tries to bring up the IB interface. This can happen either on VM reboot or when trying to create a VM image after generalization. The VM boot logs may show an error like so:
-```console
+```output
 “Starting Network Service...RuntimeError: duplicate mac found! both 'eth1' and 'ib0' have mac”.
 ```
 
@@ -51,11 +51,11 @@ This 'duplicate MAC with cloud-init on Ubuntu" is a known issue. This will be re
 2) Install the necessary software packages to enable IB ([instruction here](https://techcommunity.microsoft.com/t5/azure-compute/configuring-infiniband-for-ubuntu-hpc-and-gpu-vms/ba-p/1221351))
 3) Edit waagent.conf to change EnableRDMA=y
 4) Disable networking in cloud-init
-    ```console
+    ```bash
     echo network: {config: disabled} | sudo tee /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
     ```
 5) Edit netplan's networking configuration file generated by cloud-init to remove the MAC
-    ```console
+    ```bash
     sudo bash -c "cat > /etc/netplan/50-cloud-init.yaml" <<'EOF'
     network:
       ethernets:
@@ -73,8 +73,8 @@ HB-series VMs can only expose 228 GB of RAM to guest VMs at this time. Similarly
 
 GSS Proxy has a known bug in CentOS/RHEL 7.5 that can manifest as a significant performance and responsiveness penalty when used with NFS. This can be mitigated with:
 
-```console
-sed -i 's/GSS_USE_PROXY="yes"/GSS_USE_PROXY="no"/g' /etc/sysconfig/nfs
+```bash
+sudo sed -i 's/GSS_USE_PROXY="yes"/GSS_USE_PROXY="no"/g' /etc/sysconfig/nfs
 ```
 
 ## Cache Cleaning
@@ -85,10 +85,10 @@ On HPC systems, it is often useful to clean up the memory after a job has finish
 
 Using `numactl -H` will show which NUMAnode(s) the memory is buffered with (possibly all). In Linux, users can clean the caches in three ways to return buffered or cached memory to ‘free’. You need to be root or have sudo permissions.
 
-```console
-echo 1 > /proc/sys/vm/drop_caches [frees page-cache]
-echo 2 > /proc/sys/vm/drop_caches [frees slab objects e.g. dentries, inodes]
-echo 3 > /proc/sys/vm/drop_caches [cleans page-cache and slab objects]
+```bash
+sudo echo 1 > /proc/sys/vm/drop_caches [frees page-cache]
+sudo echo 2 > /proc/sys/vm/drop_caches [frees slab objects e.g. dentries, inodes]
+sudo echo 3 > /proc/sys/vm/drop_caches [cleans page-cache and slab objects]
 ```
 
 ![Screenshot of command prompt after cleaning](./media/hpc/cache-cleaning-2.png)
@@ -97,7 +97,7 @@ echo 3 > /proc/sys/vm/drop_caches [cleans page-cache and slab objects]
 
 You may ignore the following kernel warning messages when booting an HB-series VM under Linux. This is due to a known limitation of the Azure hypervisor that will be addressed over time.
 
-```console
+```output
 [  0.004000] WARNING: CPU: 4 PID: 0 at arch/x86/kernel/smpboot.c:376 topology_sane.isra.3+0x80/0x90
 [  0.004000] sched: CPU #4's llc-sibling CPU #0 is not on the same node! [node: 1 != 0]. Ignoring dependency.
 [  0.004000] Modules linked in: