Hello all and excuse me if this is a silly question. I looked around in
the wiki and list archives but couldn't find any in-depth discussion
about this:
I just realized that, since raid1 in btrfs is special (meaning only two
copies in different devices), the effect in terms of resilience achieved
with raid1 and raid5 are the same: you can lose one drive and not lose data.
So!, presuming that raid5 were at the same level of maturity, what would
be the pros/cons of each mode?
As a corollary, I guess that if raid1 is considered a good compromise,
then functional equivalents to raid6 and beyond could simply be
implemented as "storing n copies in different devices", dropping any
complex parity computations and making this mode entirely generic. Since
this seems pretty obvious, I'd welcome your insights on what are the
things I'm missing, since it doesn't exist (and it isn't planned to be
this way, AFAIK). I can foresee consistency difficulties, but that seems
hardly insurmountable if its being done for raid1?
Thanks in advance,
Psalle.
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