[LU-4388] fsync on client does not cause OST_SYNCs to be issued

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.6.0
• Affects Version/s: Lustre 2.5.0, Lustre 2.6.0
• Labels: MB
• Severity: 3
• Assignee: Zhenyu Xu
• Reporter: Nathaniel Clark

Description

Issuing an fsync() only causes MDS_SYNC's to be issued.

Testing:
dd with conv=fsync vs. dd with oflag=sync