monitoring

Author: khensler

distributions/oracle/iscsi/BEST-PRACTICES.md

@@ -912,6 +912,13 @@ sudo tuned-adm profile iscsi-storage-uek
 sudo tuned-adm active
 ```
 
+> **⚠️ Note:** The values in this custom tuned profile are **starting points** for testing. Actual optimal values depend on:
+> - **Driver/firmware limitations**: Check NIC and UEK driver documentation for supported buffer sizes and queue depths
+> - **Hardware capabilities**: Use `ethtool -g <interface>` to verify ring buffer limits
+> - **Workload characteristics**: Sequential vs. random I/O, block sizes, concurrency
+>
+> **Always validate with performance monitoring** (`iostat -x 1`, `sar -n DEV 1`, `perf`, Oracle OSWatcher) before deploying to production. Measure baseline performance first, then test changes incrementally.
+
 ---
 
 ## Monitoring & Maintenance

distributions/oracle/nvme-tcp/BEST-PRACTICES.md

@@ -636,6 +636,13 @@ tuned-adm active
 tuned-adm verify
 ```
 
+> **⚠️ Note:** The values in this custom tuned profile are **starting points** for testing. Actual optimal values depend on:
+> - **Driver/firmware limitations**: Check NIC and UEK driver documentation for supported buffer sizes and queue depths
+> - **Hardware capabilities**: Use `ethtool -g <interface>` to verify ring buffer limits
+> - **Workload characteristics**: Sequential vs. random I/O, block sizes, concurrency
+>
+> **Always validate with performance monitoring** (`iostat -x 1`, `sar -n DEV 1`, `perf`, Oracle OSWatcher) before deploying to production. Measure baseline performance first, then test changes incrementally.
+
 ### IRQ Affinity for UEK
 
 UEK has better IRQ handling, but you can optimize further:

distributions/rhel/iscsi/BEST-PRACTICES.md

@@ -691,6 +691,13 @@ sudo tuned-adm profile iscsi-storage
 sudo tuned-adm active
 ```
 
+> **⚠️ Note:** The values in this custom tuned profile are **starting points** for testing. Actual optimal values depend on:
+> - **Driver/firmware limitations**: Check NIC and storage driver documentation for supported buffer sizes and queue depths
+> - **Hardware capabilities**: Use `ethtool -g <interface>` to verify ring buffer limits
+> - **Workload characteristics**: Sequential vs. random I/O, block sizes, concurrency
+>
+> **Always validate with performance monitoring** (`iostat -x 1`, `sar -n DEV 1`, `perf`, vendor telemetry) before deploying to production. Measure baseline performance first, then test changes incrementally.
+
 #### Kernel Parameters
 
 **Optimize kernel for iSCSI:**

distributions/rhel/nvme-tcp/BEST-PRACTICES.md

@@ -610,6 +610,13 @@ sudo tuned-adm profile nvme-tcp-storage
 sudo tuned-adm active
 ```
 
+> **⚠️ Note:** The values in this custom tuned profile are **starting points** for testing. Actual optimal values depend on:
+> - **Driver/firmware limitations**: Check NIC and storage driver documentation for supported buffer sizes and queue depths
+> - **Hardware capabilities**: Use `ethtool -g <interface>` to verify ring buffer limits
+> - **Workload characteristics**: Sequential vs. random I/O, block sizes, concurrency
+>
+> **Always validate with performance monitoring** (`iostat -x 1`, `sar -n DEV 1`, `perf`, vendor telemetry) before deploying to production. Measure baseline performance first, then test changes incrementally.
+
 ### IRQ Affinity for Storage NICs
 
 **Automatic IRQ distribution:**