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PASSEDvendor / cisco_ucs_blade_server_failure
Cisco UCS Blade Server Failure
A Cisco UCS B200 M6 blade server in a UCS 5108 chassis experiences a memory DIMM failure that causes repeated reboots, affecting 20 VMs hosted on the blade and triggering VMware HA restarts.
Pattern
CISCO_EVENT
Severity
CRITICAL
Confidence
95%
Remediation
Remote Hands
Test Results
| Metric | Expected | Actual | Result |
|---|---|---|---|
| Pattern Recognition | CISCO_EVENT | CISCO_EVENT | |
| Severity Assessment | CRITICAL | CRITICAL | |
| Incident Correlation | Yes | 18 linked | |
| Cascade Escalation | N/A | No | |
| Remediation | — | Remote Hands — Corax contacts on-site support via call, email, or API |
Scenario Conditions
Cisco UCS 5108 chassis with 8 blades. B200 M6 blade in slot 3 memory DIMM failure. Blade boot-looping every 5 minutes. 20 VMs on the blade. VMware HA attempting to restart VMs on other blades. UCS Manager alerting.
Injected Error Messages (2)
cisco UCS B200 M6 blade failure in chassis 1 slot 3 — UCS Manager reporting critical fault: 'memory DIMM A1 uncorrectable ECC error', cisco UCS blade rebooting in loop every 5 minutes, POST failing at memory initialization, cisco UCS Manager health: blade 1/3 status operability: inoperable, 20 VMs previously hosted on blade displaced, VMware HA restart attempts in progress
cisco UCS blade 1/3 hardware failure — cisco UCS CIMC (BMC) reporting DIMM A1 failed with uncorrectable multi-bit ECC error, blade unable to complete POST, cisco UCS service profile association: failed, cisco UCS Manager recommending blade isolation and DIMM replacement, blade firmware log: 'ASSERT: memory training failed — DIMM A1 slot', server inoperable until hardware replacement
Neural Engine Root Cause Analysis
This is a hardware failure of a Cisco UCS B200 M6 blade server where DIMM A1 is experiencing uncorrectable ECC memory errors. The faulty memory module is causing POST failures during memory initialization, resulting in continuous boot loops every 5 minutes. This hardware-level failure has displaced 20 VMs that were running on the blade, triggering VMware HA to attempt restart procedures on remaining healthy hosts.
Remediation Plan
1. Immediately isolate the failed blade (chassis 1, slot 3) in UCS Manager to prevent further boot attempts. 2. Verify VMware HA has successfully migrated all 20 displaced VMs to healthy hosts. 3. Schedule maintenance window to physically replace the faulty DIMM A1 memory module in the B200 M6 blade. 4. After hardware replacement, run extended memory diagnostics to ensure stability. 5. Re-acknowledge the blade in UCS Manager and restore it to the compute pool. 6. Monitor for 24 hours to confirm stable operation before considering the incident resolved.
Tested: 2026-03-30Monitors: 2 | Incidents: 2Test ID: cmnck92f007njobqeggmmeec7