Term
You can select either manual or automatic DNS configuration of the ESXi host.
What is the default and what are the network requirements?
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Definition
The default is automatic. For automatic DNS to work, your network environment must have a DHCP server and a DNS server.
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Term
| T/F: Hyperthreading is enabled by default in ESXi |
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Definition
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| What is another name some manufacturers of servers use for hyperthreading? |
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Definition
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Term
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Definition
| Hyperthreading technology allows a single physical processor core to behave like two logical processors. The processor can run two independent applications at the same time. |
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| Does Hyperthreading double performance? |
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Definition
| While hyperthreading does not double the performance of a system, it can increase performance by better utilizing idle resources leading to greater throughput for certain important workload types. An application running on one logical processor of a busy core can expect slightly more than half of the throughput that it obtains while running alone on a non-hyperthreaded processor. Hyperthreading performance improvements are highly application-dependent, and some applications might see performance degradation with hyperthreading because many processor resources (such as the cache) are shared between logical processors. |
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Term
| What is Memory Compression |
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Definition
| Memory compression uses standard compression techniques (like ZIP or RAR) to extend the use of RAM instead of swapping to disk. |
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| T/F: Memory Compression is enabled by default |
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| What is the primary benefit of memory compression? |
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Definition
| Memory compression improves performance when over-committing memory by limiting the amount of swap-to-disk, a process that can take considerable time. |
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Term
To configure Memory compression you go to (inside the vSphere Client):
Configuring Memory Compression
- Open the Virtual Center and select Hosts and Clusters
- Select a host and click the Configuration tab
- Select Software | Advanced Settings
- Select Mem.MemZipMaxPct
What are you editing, what is the default value and what range of options are you given? |
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Definition
You set the size of the compression cache as a percentage of the memory size of the virtual machine. For example, if you enter 20 and a virtual machine'smemory size is 1000 MB, ESXi can use up to 200MB of host memory to store the compressed pages of the virtual machine.
If you do not set the size of the compression cache, ESXi uses the default value of 10 percent.
It can be changed to between 5 and 100 percent.
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Term
Finish the process:
Enabling/Disabling Memory Compression
- Open the Virtual Center and select Hosts and Clusters
- Select a host and click the Configuration tab
- Select Software | Advanced Settings
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Definition
| 4. Select Mem.MemZipEnable, 1 for on, 0 for off |
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Term
| T/F: You can only license ESXi Hosts through vCenter Server |
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Definition
| False: You can use vCenter Server or the vSphere Client to license an individual host. |
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