On Tue, Feb 18, 2014 at 09:33:17AM +0100, Goswin von Brederlow wrote: > > The size of global block reserve should be IMO subtracted from 'avail', > > this reports the space as free, but is in fact not. > > How much global block reserve is there? Does that explain why I can't > use the last 270G of my 19TB btrfs?
The size is dynamically adjusted according to the current fs usage, but is not larger than 512MB. I don't think it's related to the issue you are observing. > > The "used" amount of the global reserve might be included into > > filesystem 'used', but I've observed the global reserve used for short > > periods of time under some heavy stress, I'm convinced it needs to be > > accounted in the df report. > > As a comparison the ext2/3/4 filesystem has a % reserved for root and > does not show this in available. So you get filesystem with 0 bytes > free but root can still write to them. > > I would argue that available should not include the reserve. It is not > available for normal operations, right? This is different from the ext2 reserve for root, it's a reserved space for certain internal filesystem operations or as an emergency pool, eg. when one wants to delete files from a full filesystem. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
