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High CVM Memory Usage in Prism

R
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Hello -

In Prism on an 8-node cluster, we are getting an alert under Health showing 3 of 8 CVMs that their Memory Usage are @ 100%, for about a week now as shown in the graph (in Prism). However, those CVMs seem fine in vCenter. At a high level, Guest Mem % for the CVMs are around 40% or less.

Thoughts?

Thanks.
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    4 replies

    C
    Nutanix Employee
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    • cbadamiNutanix Employee
    • Nutanix Employee
    • 25 replies
    • March 10, 2015
    Hi rvillarin,Could you please get the output of the below command from one of the CVMs showing high memory usage:# cat /proc/meminfoWe will check if this is a cause for worry or not.
    --CB
    T
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    • tjagoda
    • Trailblazer
    • 30 replies
    • March 11, 2015
    What version is your cluster running? I had a similar problem where the health check would fire off into yellow status about high CVM memory usage and get "stuck" - the CVM memory usage would go back down and stay down but the alert would remain triggered for possibly days.
    R
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    • rvillarin
    • Author
    • Adventurer
    • 7 replies
    • March 11, 2015
    The cluster is running 4.0.1.1.

    It's still showing the alert in Prism for weeks now.

    Here's the output of cat /proc/meminfo:

    MemTotal: 16466964 kBMemFree: 937664 kBBuffers: 272600 kBCached: 1109760 kBSwapCached: 0 kBActive: 14200700 kBInactive: 863396 kBActive(anon): 13682816 kBInactive(anon): 2180 kBActive(file): 517884 kBInactive(file): 861216 kBUnevictable: 24536 kBMlocked: 8184 kBSwapTotal: 0 kBSwapFree: 0 kBDirty: 812 kBWriteback: 0 kBAnonPages: 13706708 kBMapped: 436092 kBShmem: 352 kBSlab: 206088 kBSReclaimable: 108460 kBSUnreclaim: 97628 kBKernelStack: 6768 kBPageTables: 89756 kBNFS_Unstable: 0 kBBounce: 0 kBWritebackTmp: 0 kBCommitLimit: 8233480 kBCommitted_AS: 15552704 kBVmallocTotal: 34359738367 kBVmallocUsed: 302668 kBVmallocChunk: 34359372536 kBHardwareCorrupted: 0 kBAnonHugePages: 11448320 kBHugePages_Total: 0HugePages_Free: 0HugePages_Rsvd: 0HugePages_Surp: 0Hugepagesize: 2048 kBDirectMap4k: 10240 kBDirectMap2M: 16766976 kB

    Thanks.
    C
    Nutanix Employee
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    • cbadamiNutanix Employee
    • Nutanix Employee
    • 25 replies
    • March 12, 2015
    Thanks rvillarin.Seems like we would have to dig more into the cluster status and the processes using up the memory. It is best for you to open a case with our support team to look into this.As of now, you have around 5% free memory on this CVM which is a bit of a worry, although that would not mean that something is going to breakdown.
    --CB
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