Hi, I have two questions
1) Layout of raid10 in btrfs
btrfs pools all devices and than stripes and mirrors across this pool. Is it
therefore correct, that a raid10 layout consisting of 4 devices a,b,c,d is
_not_
raid0
|---------------|
------------ -------------
|a| |b| |c| |d|
raid1 raid1
Rather, there is no clear distinction of device level between two devices
which form a raid1 set which are than paired by raid0, but simply, each bit is
mirrored across two different devices. Is this correct?
2) Recover raid10 from a failed disk
Raid10 inherits its redundancy from the raid1 scheme. If I build a raid10 from
n devices, each bit is mirrored across two devices. Therefore, in order to
restore a raid10 from a single failed device, I need to read the amount of
data worth this device from the remaining n-1 devices. In case, the amount of
data on the failed disk is in the order of the number of bits for which I can
expect an unrecoverable read error from a device, I will most likely not be
able to recover from the disk failure. Is this conclusion correct, or am I am
missing something here.
Thanks,
Wolfgang
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