Why is the cache incorrectly sized in this configuration?

Refer to the exhibit.


A solution architect is setting up a highly resilient vSAN hybrid cluster. Why is the cache incorrectly sized in this configuration?
A. Cache disk needs to meet vSAN Compatibility Guide
B. Cache-to-capacity ratio needs to be sized lower
C. Cache-to-capacity ratio needs to be sized higher
D. Number of cache disks in disk group is insufficient.

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7 thoughts on “Why is the cache incorrectly sized in this configuration?

  1. Currently we have Cache Tier Size : Capacity Tier Size equal to 4:120 = 1:30. We need to increase ratio to at least 12:120 = 3:30.

  2. B
    The plan here is to create 3 disk groups per host with 5 capacity disks per disk group. Each capacity disk is 2.4TB, so each disk group will have 12TB of capacity (5×2.4). VMware recommends 10% cache, so you should have a 1.2TB or larger cache disk. These numpties are only buying 400GB cache disks, so the cache is going to be undersized.

    Now, here’s the rub. You might think, “you need a higher ratio”…you know…like, more. But the correct answer is “lower”. What you have now is a 1:30 ratio. You need to *lower* the ratio to 1:10.

    F*ck you for stating the question this way.

    1. Why you think we need to lower the ratio from 1:30 (400:12000) to 1:10 that well be 400:4000 and in this case, you are increasing the capacity ratio and kept the cash ratio, but the question is (Why is the cache incorrectly sized in this configuration?) Which mean the change must be in the cash ratio like that {1:30 (400:12000) ==> 12:30 (1200:12000)}
      So I think the correct answer is C.

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