A vSphere administrator notices that hosts are not powering off when the total cluster load is low
on a cluster configured with Dynamic Power Management.
What condition could cause this behavior?
A.
The DRS migration threshold is set to the most conservative setting.
B.
The DRS migration threshold is set to the most aggressive setting.
C.
The DPM migration threshold is set to the most conservative setting.
D.
The DPM migration threshold is set to the most aggressive setting..
Explanation:
Answer is C
VMware DPM recommendation rankings are compared to the user-configured DPM Threshold as shown in Figure 1 http://www.vmware.com/files/pdf/Distributed-Power-Management-vSphere.pdf
. VMware DPM, with DPM Threshold set at priority 1 (most conservative), would generate only the most important (i.e., priority 1) recommendations. Setting
DPM Thresholdat priority 5 (most aggressive) would generate all recommendations.
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Sorry. Answer is A.
DPM only recommends
DRS actually migrates.
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Agree answer is A but not for that reason. It’s evil dodgy wording. Your gut says it’s “DPM threshold” because that would be the most likely answer, but that’s not an actual answer in the question. The questions says “DPM *Migration* threshold” of which there is no such thing. Therefore only A makes sense. Evil.
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Agreed!
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Well, hard to say how picky one has to be when analyzing the wording used by VMware. It could be deliberately mean as noted by Pablo, but it could also be the case of no malicious intent where things can be taken at their face value. For example, if you look at similar Question 257, the indicated correct answer “DRS is set to Manual Automation” does not make sense either purely from the semantics perspective as there’s no such a setting as “Manual Automation” (let alone the nonsense of “automation” that is “manual”).
Now, as per vSphere Client, DPM Threshold set to most conservative level means (quote) “vCenter will apply power on recommendations produced to meet vSphere HA requirements or user-specified capacity requirements”. Note – NO POWER-OFF at all, only power-on actions at this DPM level ! Power-off recommendations are made only at the next level – Priority 2 (quote) “…if host resource utilization becomes __extremely__ low…”.
Also important to remember that DMP and DRS have somewhat opposite goals: DMP – to run workload on as few hosts as possible, while DRS – distribute workload as evenly as possible.
vMotion is the actual vehicle for VM migrations for both DRS and DMP. In other words, DRS is not a decision maker when it comes to DPM.
As such, the answer here is almost certainly C – DMP Threshold at its most conservative setting.
And, while not necessarily serving as a proof, on the VCP550 exam I passed the other day with the score of 473 out of 500 (to great extent thanks to this wonderful Web site !) my choice was ‘C’.
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https://paulgrevink.wordpress.com/2012/07/29/vcap5-dca-objective-3-3-implement-and-maintain-complex-drs-solutions/
When DPM Threshold is selected as priority 1, “Conservative” is only about Power On recommendations and no Power Off.
Answer is C
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I am sticking with answer A.
https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.resmgmt.doc%2FGUID-FF9B7E6E-298B-4E0C-B0A7-44B6593D9D7B.html
Regarding DPM at the above URL it states the following:
“The threshold is configured under Power Management in the cluster’s Settings dialog box. Each level you move the VMware DPM Threshold slider to the right allows the inclusion of one more lower level of priority in the set of recommendations that are executed automatically or appear as recommendations to be manually executed.”
Notice it said ‘recommendations that are executed automatically’ and so to me this means DPM itself doesn’t just recommend things…it actually executes changes automatically if configured to do so.
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Uhg, I meant to say I am sticking with answer C not A…sorry for the confusion!
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answer is C full stop
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C looks good.
DPM can power off servers.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2007560
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It does state ‘hosts’ and not guests, so therefore C
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“A vSphere administrator notices that hosts are not powering off” DRS can not power off a HOST, only DPM can power off a HOST. DPM is located under setting of the cluster “Power Managment” and yes, DPM has threshold settings: http://ravatheodor.blogspot.ca/2013/03/vmware-distributed-power-management-dpm.html
Answer is C
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If the DRS migration threshold is set to Conservative, the Target Host Load
Standard Deviation entry will report a value of N/A, since no attempt to
load-balance is made when this setting is selected.
(hope my guess is right, if ill meet i’ll stuck on A)
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Very tricky. But A.
http://www.settlersoman.com/vmware-vcenter-distributed-power-management-dpm-overview-and-configuration/
“if the VMware DRS migration recommendation threshold is set to priority 1, VMware DPM does not recommend any host power-off operations. In this level, VMware DRS generates vMotion recommendations only to address constraint violations and not to rebalance virtual machines across hosts in the cluster.“
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