We previously identified a bug in the Lustre filesystems related to the use of the operation "fallocate" that could result a deadlock situation. As a result, we disabled its use on Eagle. To be consistent with the environment across all our Lustre filesystems, we are going to disable the operation "fallocate" on Flare as well, until a solution is available.

Workloads using "fallocate" may experience a minor performance hit, non-zero return codes, and files not pre-allocating on the filesystem.

Please contact support@alcf.anl.gov with any questions comments or concerns.