ADDDC Sparing—System reliability is optimized by holding memory in reserve so that it can be used in case other DIMMs fail. This mode provides some memory redundancy, but does not provide as much redundancy as mirroring.
Cisco UCS Manager remote plugin for the vSphere HTML client: 4.0(0) vs 4.0(1), supported vCenter 7.0 U1 to 9.0, appliance sizing, install and Proactive HA.
Add Cisco UCS fault F1705 (Rank VLS) as a custom fault in the UCS Manager Plugin 4.0(0) for the vSphere HTML client, so Proactive HA can react to it.
Cisco Field Notice FN-72368: some DIMMs might fail prematurely due to a manufacturing deviation. What's affected, and why ADDDC and PPR help.
ADDDC Sparing and PPR on Cisco UCS M5: how they work, the Memory RAS and PPR Type BIOS tokens, FN-70432 firmware, and handling F1705/F1706 events.
Use Fault Resilient Memory (reliable memory) on Cisco UCS with ESXi to protect against uncorrectable memory errors: how to enable it in UCS.
UCS M5 servers could hang and reboot (#IERR, M2M timeout) once ADDDC virtual lockstep kicked in. The Cisco bugs, fixed releases and what to run now.
Proactive HA working on vCenter 6.7 with the Cisco UCS Manager Plugin 3.0(2) beta for the vSphere HTML client, tested on 9 clusters and 290 hosts.