-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 12/19/2014 2:59 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?
If you don't want the overhead of those checksums, then yea. Also I would question why you are using btrfs to hold only big vm files in the first place. You would be better off using lvm thinp volumes instead of files, though personally I prefer to just use regular lvm volumes and manually allocate enough space. It avoids the fragmentation you get from thin provisioning ( or qcow2 ) at the cost of a bit of overallocated space and the need to do some manual resizing to add more if and when it is needed. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) iQEcBAEBAgAGBQJUlIwGAAoJENRVrw2cjl5RlGEH/1OYz07C/OjGBASA9IHTCVMV NkYHnO3/s2+SOsafQj4ej/RifgX9aG43b8Y6z9XAdosG/X+8z7xRjW9Nic0H5beK JZRpwP+02Dw02A3/RSPjGqJBeAmS8yi9yTlunnPaCau+m1kPYL4M/vFM8/hqrGeU Jy+jbffX+XtOedBWptxnDVIyXpYskgVyH8AmQ9d3TGrv52jw/QY1BxkuoVG60hBU Fk4Q8ed43C9zjCVihmkDOeER6Ygr1roDb1/gFLoeCk4FwVLO9Kusft2Qi2oXyHy1 iTkoVJan8NRzXBhrPtZexxQdewHSw9Z4wyHxlal3b/xIbRf6/DRwPRHfgG5djvM= =AqC/ -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
