On Oct 28, 2012, at 4:20 PM, sam tygier <samtygier@yahoo.co.uk> wrote:
> Hi,
> I recently got into a stick situation because i had a btrfs volume with
data in raid1 but metadata as dup. when i removed one of the drives i could not
mount as degraded. This was my error as i did not convert the metadata when i
converted it from a single/dup volume.
>
> But i wonder if there should be a warning for raid combinations that are
probably mistakes. raid1/dup, provides no protection against a failed disk, but
uses as much space as if it did. so maybe the tools could have refused to allow
it without a --force.
I think the argument I''ve read recently, is that an automatic
"upgrade" of metadata to raid1 in this case is desired. I''d
like to see metadata upgraded to raid1 when a 2nd disk is added in any case, by
default. In data raid0 or single, I''m probably hosed with one drive
failures, but maybe I can get some fragments off the drive if I have metadata.
Is there a downside? I don''t think so because the default metadata
profile for multiple device mkfs is raid1 in any case.
Chris Murphy--
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