[LU-763] DIO write does not force sync journal commit on OST

• Type: Bug
• Resolution: Cannot Reproduce
• Priority: Major
• Affects Version/s: Lustre 1.8.6
• Severity: 2
• Assignee: Oleg Drokin
• Reporter: Eric Barton (Inactive)

Description

using sgp_dd to write to a Lustre file with async journal commits enabled, the JBD history shows that journal entries are being committed only at the timeout interval, and not synchronously on each write. This will cause data loss if the OST crashes after the data is written but before the journal is flushed.