On 12/19/2014 02:59 PM, Daniele Testa wrote:
No, I don't have any snapshots or subvolumes. Only that single file.
The file has both checksums and datacow on it. I will do "chattr +C"
on the parent dir and re-create the file to make sure all files are
marked as "nodatacow".
Should I also turn off checksums with the mount-flags if this
filesystem only contain big VM-files? Or is it not needed if I put +C
on the parent dir?
Please God don't turn off of checksums. Checksums are tracked in
metadata anyway, they won't show up in the data accounting. Our csums
are 8 bytes per block, so basic math says you are going to max out at
604 megabytes for that big of a file.
Please people try to only take advice from people who know what they are
talking about. So unless it's from somebody who has commits in
btrfs/btrfs-progs take their feedback with a grain of salt. Thanks,
Josef
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