On Wed, Nov 19, 2014 at 09:35:18AM +1100, Dave Chinner wrote: > On Tue, Nov 18, 2014 at 08:32:07AM -0500, Brian Foster wrote: > > On Tue, Nov 18, 2014 at 06:05:58PM +0530, Mukul Malhotra wrote: > > > Hello, > > > > > > Does xfs have reserved blocks too, like ext* ? if yes, how can they be > > > determined ? > > > > > > > XFS reserves blocks internally such that it can perform operations when > > all free space is consumed, etc. It looks like 5% is the default. > > Not quite. > > /* > * We default to 5% or 8192 fsbs of space reserved, whichever is > * smaller. This is intended to cover concurrent allocation > * transactions when we initially hit enospc. These each require a 4 > * block reservation. Hence by default we cover roughly 2000 concurrent > * allocation reservations. > */ > > So, in most cases, there are 32MB of reserved blocks available for > internal emergency use. > Yep, I glossed right over the hard cap... thanks. ;) Brian > > I don't think it's "like ext4," however, which reserves blocks for the > > root user. I don't believe the reserved blocks in XFS are accessible for > > file allocation by any user unless the reserve pool is modified as such. > > Most definitely not "like ext4". The reserved blocks are considered > "used space" (i.e. not available to any user) and are reported as > such in statfs() output (e.g. via df). > > Cheers, > > Dave. > -- > Dave Chinner > david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
