[LU-5863] Can't mount MGS due to label being less than 8 characters long.

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.7.0
• Affects Version/s: Lustre 2.7.0
• Labels: HB patch
• Severity: 3
• Assignee: James Nunez (Inactive)
• Reporter: James A Simmons

Description

The patch for LU-5383 fixed a out bound for ldd_svname. It test to see if ldd_svname is at least 8 characters in length but the function in lustre_disk.h server_make_name() sets ldd_svname for the mgs to MGS which is to short. This can prevent the MGS from mounting.

Issue Links

• is duplicated by: LU-5876 MGS volumes with short names do not mount since LU-5383 utils: fix array index out of bounds

Comments

[Peter Jones]

Landed for 2.7

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch http://review.whamcloud.com/13391/
Subject: LU-5863 tests: add a separate MGS/MDS test case into conf-sanity
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 589d93f8b01f0a923c0f6ebb64c7ad9935fb05da

[Jian Yu]

Thank you Patrick and James for the information. The work to enhance autotest system is tracked in TEI-91. For this ticket, I pushed the above patch to add a test case into conf-sanity.sh to verify separate MGS/MDS. The new test case will not be skipped under autotest combined MGS/MDS configuration.

[Gerrit Updater]

Jian Yu ([e-mail]) uploaded a new patch: http://review.whamcloud.com/13391
Subject: LU-5863 tests: add a separate MGS/MDS test case into conf-sanity
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 41231258e22cb35555e17a8b94d80c7bfdc5522d

[James A Simmons]

Same here. ORNL has run separate MGS/MDS servers for years. If I remember right running separate MGS/MDS is required for IR to work properly.

[Patrick Farrell (Inactive)]

In case it influences the decision to know what people are doing in the real world, Cray is increasingly using separate MGS and MDS volumes for ease of backup and recovery.
Also for DNE - it's convenient to have MDS volumes all identical.

[Jian Yu]

Hi Andreas,

Clearly, we need a conf-sanity test that formats a separate MGS and mounts it, since we can't possibly have had such a test if this bug slipped through.

I found that conf-sanity test 21d is a basic test case that starting a separate MGS. However, autotest system always uses the configuration of combined MGT and MDT, and then test 21d has been always skipped. Should we enhance autotest system to add a configuration of separated MGT and MDT, and run a test session with this configuration?
For now and this ticket, I'll just add a new test case that formats $fs2mds_DEV as a separate MGT and mounts it.

[Jian Yu]

Sure. I'll do.