[LU-7795] least_qunit should be tunnable

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.9.0
• Affects Version/s: Lustre 2.5.3
• Assignee: Niu Yawei (Inactive)
• Reporter: Mahmoud Hanafi

Description

In order to better adjust filesystem performance when using quotas we would like to have a tunable least_qunit option.

Issue Links

• is related to: LU-4139 Significant perforamce issue when user over soft quota limit

Comments

[Peter Jones]

Landed for 2.9

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch http://review.whamcloud.com/18896/
Subject: LU-7795 quota: tuneable soft least qunit
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 0cadce268a09a94824b82bc1a61e98963582c423

[Niu Yawei (Inactive)]

The client sync write will be triggered when approaching/exceeding hard limit, if there is no hard limit, sync write won't be triggered.

[Mahmoud Hanafi]

With this patch when is client sync writes triggered?

[Niu Yawei (Inactive)]

Here is the port to b2_5_fe: http://review.whamcloud.com/#/c/18976/

[Jay Lan (Inactive)]

Can you provide a back port to 2.5.3-fe?
It is not obvious to me how to resolve the conflicts on lprocfs_quota_qpi_vars declaration.

Thanks!

[Gerrit Updater]

Niu Yawei ([e-mail]) uploaded a new patch: http://review.whamcloud.com/18896
Subject: LU-7795 quota: tuneable soft least qunit
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 601fa84017a98450432d5cb3dbdea0cd8b82e056

[Mahmoud Hanafi]

That sounds like what we would need.

[Niu Yawei (Inactive)]

It's global setting, and least qunit is also a global parameter.

[Mahmoud Hanafi]

Are you purposing a per-user setting or global for a filesystem? Turn off qunit adjustment must a admin only function.