[LUDOC-458] Inode ratio size ldiskfs

• Type: Improvement
• Resolution: Fixed
• Priority: Minor

Epic/Theme

ldiskfs

• Assignee: Lustre Manual Triage
• Reporter: CEA

Description

Hi,

I believe the Lustre Manual has to be update about Inode ratio size (Section 5.3.1).

It seems this "old" discussion brings precision: http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2018-February/015308.html

It is written: "It is recommended to use an inode ratio at least 1024 bytes larger than the inode size to ensure the MDT does not run out of space. Increasing the inode ratio to include enough space for the most common file data (e.g. 5120 or 65560 bytes if 4KB or 64KB files are widely used) is recommended for DoM."

We could modify it, something like that:

"It is recommended to use an inode ratio at least 1024 bytes larger than the inode size to ensure the MDT does not run out of space (default inode ratio is 2560 bytes). Increasing the inode ratio to include enough space for the most common file data (e.g. 5656 or 68096 bytes if 4KB or 64KB files are widely used) is recommended for DoM."

Does it make sense?

Issue Links

• is related to: LU-11181 df -i and lfs df -i show incorrect inode count

Comments

[Gerrit Updater]

Andreas Dilger ([e-mail]) merged in patch https://review.whamcloud.com/41392/
Subject: LUDOC-458 setup: update ldiskfs MDT inode ratios
Project: doc/manual
Branch: master
Current Patch Set:
Commit: ef6373a0cdb9280ac9c1b14c944ee390a3053c7b

[Gerrit Updater]

Andreas Dilger ([e-mail]) uploaded a new patch: https://review.whamcloud.com/41392
Subject: LUDOC-458 setup: update ldiskfs MDT inode ratios
Project: doc/manual
Branch: master
Current Patch Set: 1
Commit: 74af337e1ee34eaec1abc0f5f2e50f39da48c25e