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Document Version Release Date Details 2 12/21/2018 Additional information added to Description section. 1 11/01/2018 Original document release The Superdome Flex system is shipped with memory RAS features enabled by default and HPE strongly recommends that customers only operate their Superdome Flex system(s) and nPar(s) in this default memory RAS enabled mode. If the Superdome Flex system or nPar(s) is changed to operate in HPC mode by disabling memory RAS features, the firmware should be updated to version 2.5.290 (or later) to mitigate potential unpredictable system behavior resulting from such switch to HPC mode. Note: This advisory only affects Superdome Flex customers who have changed the operating mode for memory RAS features on their system(s) or nPar(s) to HPC mode. The current state of operation can be viewed via the RMC/eRMC command SHOW NPAR as in the following example: If the column under RAS indicates "On," the memory RAS features are fully enabled, and no further action is required. If the column under the RAS heading indicates HPC, then HPE strongly recommends resetting the mode back to "RAS=on" or update the firmware to version 2.5.290 (or later) if it is elected to operate or stay in HPC mode. Note to High Performance Computing (HPC) environments: Disabling RAS features will show RAS = HPC. Historically, RAS features consumed some amount of processor performance and unlike enterprise application environments, HPC environments often trade regaining performance for less resiliency to DIMM failures. With Intel Scalable Processors (Skylake), however, the amount of performance consumed by RAS features is extremely small. HPE therefore recommends a Superdome Flex RAS setting of "On" for Mission Critical and HPC environments alike.If the column under RAS indicates "On," the memory RAS features are fully enabled, and no further action is required. If the column under the RAS heading indicates HPC, then HPE strongly recommends customers reset the mode back to "RAS=on" or update their firmware to version 2.5.290 (or later) if they elect to operate or stay in HPC mode.
Any HPE Superdome Flex system or nPar(s) operating in HPC mode.
HPE has delivered updated firmware in version 2.5.290 to resolve certain potential unexpected system behavior resulting from changing Superdome Flex system or nPar(s) to operate in HPC mode. Notwithstanding this fix, be aware that disabling the memory RAS features to operate the system in HPC mode reduces system resilience to memory error, and could result in a system crash. HPE strongly recommends resetting the operational mode of the system(s) and nPar(s) back to RAS=On. This can be accomplished by first shutting down the OS of each nPar, then using the MODIFY NPAR command to change the RAS mode, and then returned to an operational state by powering the system/npar(s) back on. Linux # shutdown –h now RMC:cli> modify npar pnum=PARTITION_ID ras=on RMC:cli> power on npar pnum=PARTITION_ID For customers that elect to operate their Superdome Flex system or nPar(s) in HPC mode, despite the potential for unexpected system behavior, including reduced system resilience to memory error that could result in a system crash, HPE strongly recommends that such customers update the Superdome Flex server firmware to version 2.5.290 (or later): https://support.hpe.com/hpsc/swd/public/detail?swItemId=MTX_ada76c25cc6741fd89b14d3cb4 NOTE: Products sold prior to the November 1, 2015 separation of Hewlett-Packard Company into Hewlett Packard Enterprise Company and HP Inc. may have older product names and model numbers that differ from current models. RECEIVE PROACTIVE UPDATES : Receive support alerts (such as Customer Advisories), as well as updates on drivers, software, firmware, and customer replaceable components, proactively via e-mail through HPE Subscriber's Choice. Sign up for Subscriber's Choice at the following URL: Proactive Updates Subscription Form. NAVIGATION TIP : For hints on navigating HPE.com to locate the latest drivers, patches, and other support software downloads for ProLiant servers and Options, refer to the Navigation Tips document . SEARCH TIP : For hints on locating similar documents on HPE.com, refer to the Search Tips Document .