LRC low level plugin configuration of the following example copes with a single
erasure while it can easily protect from two.
In case I use the layers:
1: DDDDDDc_ _
2: DDD_ _ _ _c_
3: _ _ _DDD_ _c
Neither of the rules protect from 2 failures. However, if we calculate the XOR
of the two local parities we can treat the calculated value as a second parity
disk and cope with two erasures.
This thread discusses the same issue, while according to my understanding it
doesn't provide a solution.
http://www.spinics.net/lists/ceph-devel/msg19886.html
Is there a way to make the proposed construction cope with 2 erasures? A few
modifications are acceptable.
Thank you,
Matan Liram
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