[LU-2108] mds created with backup, mkfs.lustre, restore can not connect to mgs

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Affects Version/s: Lustre 2.4.0
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev

Description

this was seen with sanity-scrub.sh: mkfs.lustre creates "virgin" filesystem
(labeled with '=' delimiter), then MGS tries to register on MGS with LDD_F_VIRGIN and gets rejected.