[LU-1452] LFSCK 4: Improve inode iteration for uninitialized groups

• Type: Technical task
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.7.0
• Labels: LFSCK
• Assignee: nasf (Inactive)
• Reporter: nasf (Inactive)

Description

For ldiskfs-based backend, the OI scrub scans the local device linearly. It iterates all the inodes on the ldiskfs partition in the inode tables in each block group without distinguishing whether the block group that contains the inode table has been initialised or not. In fact, to speed up the mke2fs and local e2fsck, the ldiskfs supports "uninit_bg" feature that allows to create the backend-filesystem without initializing all of the block groups, then dramatically reduce e2fsck time.

So for the iteration used by the new LFSCK (including backend OI scrub), it should also make use of such feature to skip uninitialised block groups to optimise the scanning.

Comments

[Gerrit Updater]

Fan Yong ([e-mail]) uploaded a new patch: http://review.whamcloud.com/13338
Subject: LU-1452 scrub: test for skipping uninitialized groups
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 813640e4144042ff774ea54417073a5f4f9e2ce3

[nasf (Inactive)]

The patch has been landed to master.

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch http://review.whamcloud.com/12737/
Subject: LU-1452 scrub: OI scrub skips uninitialized groups
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 9ce1fdd9b79bca5cd4dbeb4740fbc889c573d5fc

[Gerrit Updater]

Fan Yong ([e-mail]) uploaded a new patch: http://review.whamcloud.com/12737
Subject: LU-1452 scrub: OI scrub skips uninitialized groups
Project: fs/lustre-release
Branch: master
Current Patch Set: 3
Commit: 215bdd0e1384a2c27b9cf4ca0e19fefbe61f10c4

[Gerrit Updater]

Fan Yong ([e-mail]) uploaded a new patch: http://review.whamcloud.com/12737
Subject: LU-1452 scrub: OI scrub skips uninitialized groups
Project: fs/lustre-release
Branch: master
Current Patch Set: 2
Commit: d85bf60a31d617b3fd69cd33e652d71fc44e2030

[Gerrit Updater]

Fan Yong ([e-mail]) uploaded a new patch: http://review.whamcloud.com/12737
Subject: LU-1452 scrub: OI scrub skips uninitialized groups
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 5abec40daf05205d1cf04fcf2eac2c2924b814b0

[Cory Spitz]

This ticket could use a better description.