2011-03-23 12:13:45 +0700, Fajar A. Nugraha: > On Mon, Mar 21, 2011 at 11:24 PM, Stephane Chazelas > <stephane.chazelas@xxxxxxxxx> wrote: > > AFAICT, compression is enabled at mount time and would > > only apply to newly created files. Is there a way to compress > > files already in a btrfs filesystem? > > You need to select the files manually (not possible to select a > directory), but yes, it's possible using "btrfs filesystem defragment > -c" [...] Thanks. However I find that for files that have snapshots, it ends up increasing disk usage instead of reducing it (size of the file + size of the compressed file, instead of size of the file). If I do the btrfs fi de on both the volume and its snapshot, I end up with some benefit only if the compression ratio is over 2 (and with more snapshots, there's little chance of getting any benefit at all). Also, with dozens of snapshots on a 4TB volume, it's likely to take weeks to do. Is there a way around that? Thanks Stephane -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
