[LU-2465] e2mmpstatus utility

• Status: Resolved
• Project: Lustre
• Affects Version/s: Lustre 2.3.0, Lustre 2.1.3
• Type: Improvement
• Priority: Minor
• Reporter: Shuichi Ihara (Inactive)
• Assignee: Andreas Dilger
• Resolution: Fixed
• Labels: patch

Environment

Lustre, failover, pacemaker/corosync

Description

This is a utility to read MMP status. This is based on dump_mmp() in debugfs.c.
We added checking recent MMP updates and printed out updated nodename.
This helps the lustre does failover. It prevents both servers issue STONITH at same time when the heartbeat's interlink connection lost. It's kind of idea of quorum disk for the HA clustering.

Comments

[Peter Jones]

http://review.whamcloud.com/#change,4800

[Shuichi Ihara (Inactive)]

re-submitted to correct project and branch.
http://review.whamcloud.com/#change,4840

[Gerrit Updater]

Nathaniel Clark ([e-mail]) uploaded a new patch: https://review.whamcloud.com/31532
Subject: LU-2465 util: e2mmpstatus utility
Project: tools/e2fsprogs
Branch: master
Current Patch Set: 1
Commit: e5e096fa9c5b86eb86d192b3000cd6bbbee07c90

[Andreas Dilger]

Patches have been submitted upstream for this but haven't landed yet:
http://lists.openwall.net/linux-ext4/2017/12/22/1
http://lists.openwall.net/linux-ext4/2018/01/12/1

[Andreas Dilger]

The mmpstatus utility was landed into the upstream e2fsprogs in commit 32b8802aa5d867a0497cd6135c5f48039b0ba71c for the 1.44.3 release.

Note that the utility also accepts the "e2mmpstatus" name, so in new deployments it would be better to use "e2mmpstatus" since this makes it more clear that it is part of e2fsprogs.