[LU-12103] Improve block allocation for large partitions

• Type: Improvement
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.4
• Assignee: Artem Blagodarenko (Inactive)
• Reporter: Artem Blagodarenko (Inactive)

Description

Block allocator uses some heuristic while chooseing group to allocate new blocks. This works good in most cases, but take a time for large low-free-space partition. The algorithm should be adjusted for this special case.

Issue Links

• is related to: LU-12335 mb_prealloc_table table read/write code is racy
• is related to: LU-12970 improve mballoc for huge filesystems
• is related to: LU-12988 improve mount time on huge ldiskfs filesystem
• is related to: LU-14305 add persistent tuning for mb_c3_threshold
• is related to: LU-8365 Fix mballoc stream allocator to better use free space at start of drive
• is related to: LU-12345 backport - ext4: optimize ext4_find_delalloc_range() in nodelalloc mode
• is related to: LU-12801 Port "ldiskfs: don't search large block range if disk full" to RHEL 8

Comments

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/36681/
Subject: LU-12103 ldiskfs: don't search large block range if disk full
Project: fs/lustre-release
Branch: b2_12
Current Patch Set:
Commit: 810a952303969ca0ee01639a5408ff2f0e3456d9

[Andreas Dilger]

Hi Artem, I noticed that this patch was only added to the rhel7.6 series, but not the rhel7.7 and rhel8.0 series. Could you please submit a patch to add ext4-simple-blockalloc.patch to these newer series.