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You are not able to start more than 4 SSAS tabular model instances with default configuration settings

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I have worked on a few cases with this problem. You are not able to start more than 4 SSAS tabular model instances with default configuration settings. The 5th tabular model instance just cannot start unless one of the first 4 instance is stopped.

This is an interesting problem. I found after installing 4 SSAS tabular instances, the 5th instance cannot start until I lower all the instances setting of VeritipaqMemoryLimit to 5. The other configurations do not matter for instances 5 to 8, until the 9th instance.

I am not able to start the 9th instance with all the instances having VertiPaqMemoryLimit=5 LowMemoryLimit=5 MinimumAllocatedMemory=5. So there must be another setting that I need to tweak. As best practice, it is also necessary to change the other memory limits, so I change the HardMemoryLimit, TotalMemoryLimit, and VirtualMemoryLimit as following, then I can start the 9th instance.

    <Memory>

        <MemoryHeapType>-1</MemoryHeapType>

        <HeapTypeForObjects>0</HeapTypeForObjects>

        <HardMemoryLimit>10</HardMemoryLimit>

        <TotalMemoryLimit>8</TotalMemoryLimit>

        <LowMemoryLimit>5</LowMemoryLimit>

        <VertiPaqMemoryLimit>5</VertiPaqMemoryLimit>

        <MidMemoryPrice>10</MidMemoryPrice>

        <HighMemoryPrice>1000</HighMemoryPrice>

        <VirtualMemoryLimit>8</VirtualMemoryLimit>

        <SessionMemoryLimit>1</SessionMemoryLimit>

        <MinimumAllocatedMemory>5</MinimumAllocatedMemory>

        <WaitCountIfHighMemory>10</WaitCountIfHighMemory>

        <DefaultPagesCountToReuse>2</DefaultPagesCountToReuse>

        <HandleIA64AlignmentFaults>0</HandleIA64AlignmentFaults>

        <PreAllocate>0</PreAllocate>

        <VertiPaqPagingPolicy>1</VertiPaqPagingPolicy>

        <PagePoolRestrictNumaNode>0</PagePoolRestrictNumaNode>

        <HeapTypeForObjectGroupCount>0</HeapTypeForObjectGroupCount>

        <UseCountersPerCPU>-1</UseCountersPerCPU>

    </Memory>