[LU-1122] MDS got LBUG after upgrade from 1.8.7-RHEL5 to 2.1.55-RHEL6 and then downgrade to 2.1.0-RHEL6

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.2.0
• Affects Version/s: Lustre 2.2.0
• Severity: 3
• Assignee: Zhenyu Xu
• Reporter: Sarah Liu

Description

Before upgrade,the system configuration is one MDS(1.8.7-RHEL5), two OSS(1.8.7-RHEL5 and 2.1.0-RHEL6) and two clients(1.8.7-RHEL5 and 1.8.7-RHEL6), then upgrade servers and clients to 2.1.55-RHEL6, check the system, works fine. Then do the downgrade, MDS downgrade to 2.1.0-RHEL6, OSS downgrade to 1.8.7-RHEL5 and 2.1.0-RHEL6, clients downgrade to 2.1.0-RHEL5 and 2.1.0-RHEL6

Got LBUG when checking the dir/files in the OST pool. MDS console log please see the attached.

Issue Links

• Trackbacks: Changelog 2.2 version 2.2.0 Support for networks: o2iblnd OFED 1.5.4 Server support for kernels: 2.6.32220.4.2.el6 (RHEL6) Client support for unpatched kernels: 2.6.18274.18.1.el5 (RHEL5) 2.6.32220.4.2.el6 (RHEL6) 2.6.32.360....