Thank you for your explanation Neil,
Neil Brown wrote:
When memory changes between being written to one device and to another, this
does not cause corruption, only inconsistency. Either the block will be
written again consistently soon, or it will never be read.
This is the crucial part...
Why would the filesystem reuse the same memory without rewriting the
*same* block?
Can the same memory area be used for another block?
If yes, I understand. If not, no I don't understand why the block is not
eventually rewritten to contain equal data on both disks.
Is this a power-fail-in-the-middle thing, or it can happen even when the
power is always on?
Do I understand correctly that raid-456 is instead safe ("no-mismatch")
because it copies the memory region?
Thank you
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