On 13/09/17 16:23, Chris Murphy wrote:
Right, known problem. To use o_direct implies also using nodatacow (or
at least nodatasum), e.g. xattr +C is set, done by qemu-img -o
nocow=on
https://www.spinics.net/lists/linux-btrfs/msg68244.html
Can you please elaborate? I don't have exactly the same problem as
described by the link, but I'm still worried that particularly qemu can
be less resilient to partial raid1 failures even on newer kernels, due
to missing checksums for instance. (BTW I didn't find any xattrs on my
VM images, nor do I plan to set any.)
--
With Best Regards,
Marat Khalili
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