Important concepts

Tranparent memeory page sharing is enabled by default and cannot be trun off (T/F) ?
False : enabled by default but you can trunoff using advanced setting on host.
service console is constantly sheduled on diffrent HECs(Hardware Execution Context HEC) (T/F) ?
false : service console does not participate in vKernal in constant sheduling and resheduling on HEC's
and remians on the same CPU at all the times.

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vCPU needs to be sheduled on HEC .HEC is a thread that is sheduled on a physical processor.
vKernal shedules and resdules vCPU on diffrent HEC every 20 milliseconds with the exception of service consle
which is always sheduled on first HEC or physical CPU 0 and never chnaged.
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Ballon driver max can be set to 0-max75% default is 65% in advanced config
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Virtual machine swap file is created when it is powered on and deleted when it is powered off.
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Hyperthreading :The technology that allows for sheduling of mutilple threads on the same CPU is known as
hyperthreading
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DRS cluster yellow overcommited resources
DRS cluster RED insufficent resources

DRS five start:
Most conservative :*****
ModeratelyConservative :****
Default:***
Modertely Aggressive:**
Aggresive :*
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vMotion Requirments :-
Vmotion does not work across CPU vendors
Vmotion does not work with cpu with different cpu setping or familes
Hyperthreading and cores are not relevant to vMoition
vMotion does not work cpu with diffrent multimedia instrations
NX/XD
vMotion :
When vmotion is intiated ,memoery bitmap is created to track the chnages and the process of copying the
pysical RAM from host to another begins .Quiese(cut-over) the VM and copy the contents of bit-map to destination.
vMotion and Svmotion can not be done performed at once on the VM and can be done consecutively.
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How can you reduce the amount of balloning the occur iside the VM ? reboot or poweroff
VM backup type ? file or image level backups.
File level backup : agent should be instaled in guest OS.
Back up VM files.VCB gives option for both files and image level backups.
VCB spports file backsup on windows-based systems and image level backups for all guest operating systems.
VCB and VDR are agerntless backup solutions
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Outgoing port for HA heart beats and state synchronization
TCP 2050-2250
UDP 2050-2250
incomming port for HA and state sync
TCP 8042-8045
udp 8042-8045
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HA concept:
Memeber of cluster send the heart beat every 1sec  in 4.0 and 10 sec in 10sec in 4.1.
When the other host does not respond for 15 sec the cluster intiates the VM restarts on other boxes.
DNS resolutions should work in all the hosts in cluster.
host isolation :split brain occurs when the host stoped reciving the heart beat in a HA.