2011-07-09 08:09:55 +0100, Stephane Chazelas: > 2011-07-08 16:12:28 -0400, Chris Mason: > [...] > > > I'm running a "dstat -df" at the same time and I'm seeing > > > substantive amount of disk writes on the disks that hold the > > > source FS (and I'm rsyncing from read-only snapshot subvolumes > > > in case you're thinking of atimes) almost more than onto the > > > drive holding the target FS!? > > > > These are probably atime updates. You can completely disable them with > > mount -o noatime. > [...] > > I don't think it is. First, as I said, I'm rsyncing from > read-only snapshots (and I could see atimes were not updated) > and nothing else is running. Then now looking at the traces this > morning, There was a lot written in the first minutes, then it > calmed down. [...] How embarrassing, sorry In that instance I wasn't rsyncing from the right place, so I was indeed copying non-readonly volumes before copying readonly ones. So, those writes were probably due to atimes. -- 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
