On Wed, Jan 27, 2016 at 9:24 AM, Christian Rohmann <crohmann@xxxxxxxxxxxxx> wrote: > Hey btrfs-folks, > > when one cuts the power to a machine with an 8 device RAID6 btrfs > mounted, it takes about 15 - 20 minutes to mount the btrfs again > afterwards. This is with kernel 4.4 and btrfs-progs 4.4 mind you. I > looked at iotop and it was reading from all disks heavily, so it was > doing something. The long mount time for such a rather expected case > might be a problem in itself, but either way, a mount action that takes > a while needs to present some sort of progress indication, so the user > knows what btrfs is at work getting things mounted. Might be a bug, but more likely might be a lack of optimization. If it eventually mounts without errors that's a pretty good plus. Lots of file systems can't handle power failures well at all. Mount is part of util-linux, not btrfs-progs, so any change would probably need to be there. I'm not sure the kernel even has an idea during all of this what the end point is, so a progress indication is probably not reliable. It's in the clouds on a long staircase, or maybe it's a short one, who can be sure? -- Chris Murphy -- 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
