Hi all,
I'd like your thoughts and comments on this idea:
Setup:
- two fault domains = DCs
- connected with 100 GBit, < 1 ms
- 80 NVME SSDs on each side
Goal:
One fault domain can be lost, and then there's still have some redundancy.
Option 1:
Replicated pool with size = 4. This gives me two copies on each side,
thus meets the goal. But the efficiency is only 25%.
Option 2:
Erasure coded pool with 2 + 4 scheme. This gives me 3 chunks on each
side. If I lose one side, I still have 3 chunks left, where I only need
2. Thus the goal is also met. Efficiency is 33%.
Even though I did a lot of googling, I couldn't find anything about a
similar setup. In all profiles, there is k <= m.
What do you think about 2+4, is it a good idea or a bad one, or do I
miss something and it doesn't work at all?
In particular: is it possible to recover two data chunks out of 2 coding
chunks? As I read the documentation, this should be no problem, just
want to confirm.
--
Andre Tann
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