On Wed, Oct 17, 2018 at 10:52:48AM +0300, Avi Kivity wrote: > I have a user running a 1.7TB filesystem with ~10% usage (as shown by df), > getting sporadic ENOSPC errors. The disk is mounted with inode64 and has a > relatively small number of large files. The disk is a single-member RAID0 > array, with 1MB chunk size. There are 32 AGs. Running Linux 4.9.17. 4.9.17 is rather old and you'll have a hard time finding someone familiar with it.. > Is this a known issue? Would upgrading the kernel help? Two things that come to mind: - are you sure there is no open fd to the unlinked files? That would keep the space allocated until the last link is dropped. - even once we drop the inode the space only becomes available once the transaction has committed. We do force the log if we found a busy extent, but there might be some issues. Try seeing if you hit the xfs_extent_busy_force trace point with your workload. - if you have online discard (-o discard) enabled there might be more issues like the above, especially on old kernels.
