Goffredo Baroncelli posted on Mon, 18 Jun 2012 18:47:21 +0200 as excerpted: >>> How big was the original ext4 filesystem ? >> >> 370 files with ~1GB, and 10000 small. > > I am a bit confused: 370 files of about ~1GB is about a total of > 300-400GB; instead you reported > >>>> root@tv:~# btrfs filesystem df /media/388gb-data Data: >>>> total=260.59GB, >>>> used=251.51GB You're probably correct on the COW from the ext4 conversion in this case, but just to note, in my copy (not in-place conversion) from reiserfs, I had ball-park-similar numbers, in my case because I was using compress on the btrfs side, such that the sum of dup-metadata and single data was still smaller than the used space on the reiserfs partition from which I was copying. (I had allowed for the dup metadata and created the btrfs partitions somewhat larger accordingly, but compression worked enough better than expected that total usage was less, even with dup metadata, not more. That was a nice surprise! =:^) FWIW, that was the 3.4 kernel cycle. I'm done testing for now, due to reiserfs being far better at recovery from the sata resets and graphics lockups plaguing me ATM. (I need new hardware but no $$ for it ATM.) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- 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
