[LU-10186] OI compatibility between ldiskfs and ZFS

• Type: Technical task
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.11.0
• Assignee: nasf (Inactive)
• Reporter: nasf (Inactive)

Description

For ZFS backend, the OI mapping for LAST_ID is put under the oi.xx file, it may cause some issues:

1) If we remove the oi.xx file, then before the OI scrub scanned the whole device, we can not know the last ID for related sequence. That will fail the system start as to the OI scrub will be stopped by force.

2) It is incompatible with ldiskfs backend, that will cause trouble when MDT file level restore from ldiskfs backup.