On Tue, Dec 19, 2017 at 17:08:28 -0700, Chris Murphy wrote: >>>> Now, if the current kernels won't toggle degraded RAID1 as ro, can I >>>> safely add "degraded" to the mount options? My primary concern is the >> [...] > > Well it only does rw once, then the next degraded is ro - there are > patches dealing with this better but I don't know the state. And > there's no resync code that I'm aware of, absolutely it's not good > enough to just kick off a full scrub - that has huge performance > implications and I'd consider it a regression compared to > functionality in LVM and mdadm RAID by default with the write intent > bitmap. Without some equivalent short cut, automatic degraded means a I read about the 'scrub' all over the time here, so let me ask this directly, as this is also not documented clearly: 1. is the full scrub required after ANY desync? (like: degraded mount followed by readding old device)? 2. if the scrub is omitted - is it possible that btrfs return invalid data (from the desynced and readded drive)? 3. is the scrub required to be scheduled on regular basis? By 'required' I mean by design/implementation issues/quirks, _not_ related to possible hardware malfunctions. -- Tomasz Pala <gotar@xxxxxxxxxxxxx> -- 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
