Frequently Asked Question
QuTS hero disabled an app to free system memory. Does this mean the RAM has failed?
QUICK ANSWER
Not necessarily. QuTS hero uses RAM for ZFS ARC caching as well as applications. Under memory pressure it can disable apps to protect system stability. Diagnose actual pressure before assuming a hardware fault.
Applies to: QuTS hero systems reporting an app automatically disabled to free memory; not ordinary QTS memory usage.
Work through these checks
- Read the exact event and identify which app was disabled. Check Resource Monitor for application demand, swap activity and the workloads running at that time, such as virtual machines, containers and indexing.
- Review ARC RAM Usage in the storage application’s Global Settings. QuTS hero 5.3 and later may call the application Storage Manager; earlier versions use Storage & Snapshots. Record the existing value.
- If the logs show memory pressure, an administrator can consider a lower ARC allocation to leave room for required apps. This trades some storage-cache capacity for application memory; no one percentage suits every system.
- Restart the affected app after the approved adjustment and monitor through its normal workload. Review VM/container allocations and the model’s supported RAM options if pressure continues.
Confirm the result
Required apps remain available without repeated low-memory events, and both application response and storage performance remain acceptable.
Before going further: High cache usage alone does not prove defective RAM. Do not add unsupported memory, remove production SSD cache or change undocumented kernel values as a first fix.
If you need help
Include these details in your ticket: NAS/RAM configuration, QuTS version, event text, ARC setting and memory/swap readings during the issue.
Updated 261107