Refer to the Exhibit.
Refer to the Exhibit. The list of devices attached to vmhba1 will be the basis for configuring a VMware Virtual SAN using Manual Mode.
Based on the exhibit, which two combinations of devices should be used to create Disk Group(s)? (Choose two.)
A.
One Disk Group with one Flash Drive and three HDDs
B.
Two Disk Groups with one Flash Drive and two HDDs each
C.
One Disk Group with one Flash Drive and four HDDs
D.
Two Disk Groups with two Flash Drives and four HDDs each
Explanation:
Explanation/Reference:
A and B are correct.
In hybrid configurations, there is a maximum of 7 magnetic disks per disk group for the capacity layer and there is a maximum of 1 flash device for cache per disk group.
http://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/products/vsan/virtual-san-6.2-design-and-sizing-guide.pdf
based on your explanation, C is more correct than A,
so it should be B and C I think.
If you’re only going to create one disk group, why use only 3 of the 4 usable HDD’s?
C makes more sense than A imo.
As a guideline, VMware recommends having at least a 10% flash cache to consumed capacity ratio in Virtual SAN configurations.
That’s why C is wrong.
Best practice: Ensure there is enough cache to meet the design requirements. The recommendation for cache is 10% of of the anticipated consumed storage capacity before the NumberOfFailuresToTolerate is considered.
http://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/products/vsan/virtual-san-6.2-design-and-sizing-guide.pdf
4 capacity disks = 1120 GB, 10% = 112 GB which is more than 93GB available on the flash disk
Good “gotcha” 😉
Thanks for the explanation !
A. 92/837= 11%
B. 93/558 = 16%
C. 93/1116 = 8%
D. 186/1116 = 16%
So why is D not an answer?
You don’t have enough disks. You only have 6 to work with.
In hybrid configurations, there is a maximum of 7 magnetic disks per
disk group for the capacity layer and there is a maximum of 1 flash
device for cache per disk group.
http://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/products/vsan/virtual-san-6.2-design-and-sizing-guide.pdf
It can’t be D because VSAN can contain a maximum of 1 SSD. D calls for 2 to be used
I think the term “combination” is the point.
There are 2 SSDs and 5 HDDs in total, so you can’t choose B&C since the number of HDDs would be 6.