Hi Christopher Imes,
so here is the question for "highest available" . Appreciate if you can help with that.
A customer has a heterogeneous pool with the
-800 GiB of Flash, with 300 GiB free
-12,000 GiB of SAS, with 2,000 GiB free
-50,000 GiB of NL-SAS, with 25,000 GiB free
The customer creates a new LUN with data placement policy set to "highest available tier". The LUN is
then populated with 600 GiB of data.
How is that data distributed (numbers are approximate)?
A. 220 GiB on Flash, 380 GiB on SAS, no data on NL-SAS
B. 300 GiB on Flash, 400 GiB on SAS, no data on NL-SAS
C. 200 GiB on Flash, 200 GiB on SAS, 200 GiB on NL-SAS
D. 10 GiB on Flash, 110 GiB on SAS, 480 GiB on NL-SAS
The answer is A.
The question is testing you on whether or not you know that the system will (try to) maintain 10% free per tier.
The calculations will be:
1) 800 GiB * .10 = 80 GiB (10% of Flash will be kept free in this example)
2) 300 GiB - 80 GiB = 220 GiB on Flash
3) 600 GiB - 220 GiB = 380 GiB on SAS