With RAID-0, you'd get data striped equally across all (in this case,
both) the devices, up to the size of the second-largest one, at which
point it'll stop allocating space.
By "stop allocating space" I assume you mean it will return out of space
errors, even though there is technically 250GB of unused space. I presume
there is no way to say that RAID-0 should be used where possible and then
fallback to "single" for the remaining space.
There was a proposition to change the allocator, so it would fall back
to single:
http://www.mail-archive.com/linux-btrfs@xxxxxxxxxxxxxxx/msg14517.html
I stumbled on it when faced with a different problem: I could not use
btrfs in RAID1 degraded mode, because it would refuse to allocate more
space, and I could not convert it to single either, because balance
needs to allocate space too.
Regards
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