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8 Cards in this Set
- Front
- Back
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What are the five memory techniques that ESXi uses?
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Host memory allocation - hsots allocate memory to virtual machines based on their most recent working set size and relative shares value
VMX Swap - The memory overhead required is swapped instead of using physical memory Transparent Page Sharing - Allows identical pages to be treated as one - not used when using large memory pages Memory compression - Technique used right before pages get swapped to disk. Memory pages that can be condensed to less than 2KB or less are stored in the virtual machine's compression cache Idle memory tax - During a time of contention, ESXi will reclaim idle memory. The more idle memory that a virtual machine has then more the tax goes up. The amount of tax can either be flat rate or variable (default) |
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What are the two memory reclamation techniques
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Balloon driver - when memory pressure exists the balloon driver determines the least valuable pages and swaps them to the virtual disk of the virtual machine
Swap to disk and swap to host cache - Swapping to disk is where if ballooning doesn't slow/stop contention, swapping to disk will occur. This is generally a bad situation to be in |
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What are the pre-requisites for Hot Add features?
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Hot add must be enabled per virtual machine and the virtual machine must be powered off in order to enable it
If hot-adding multi-core vCPUs then the virtual machine hardware must be using hardware version 8 Minimum hardware version is 7, though this can only have single core vCPUs |
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What OS's support Memory Hot Add
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Windows 2003 SP1 or greater (some versions require a reboot)
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What OS's support CPU hot plug
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Windows 2008 (x64 versions)
Windows 2008 R2 All versions need a reboot except for Windows Server 2008 R2 Enterprise and Datacentre |
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How do you configure the swapfile location for a cluster
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Cluster > Edit Settings
Cluster Features > Swapfile Location Select the appropriate setting |
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How do you configure the swapfile location for a host
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Configuration > Software > Virtual Machine Swapfile Location
Edit Link Choose the appropriate datastore |
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How do you configure the swapfile
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?
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