[LU-11736] Do not apply bulk IO tuning on MDT or MGT devices

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0, Lustre 2.10.7, Lustre 2.12.1
• Affects Version/s: Lustre 2.12.0, Lustre 2.10.6
• Assignee: Andreas Dilger
• Reporter: Andreas Dilger

Description

The max_sectors_kb tunable should not be applied to MDT and MGT devices. This tuning is needed for efficiency of large IO submission for spinning disks, but is not needed for SSDs or regular IO. It can cause problems with DM Multipath configurations for minimal benefits, so should be limited to OST devices.

Issue Links

• is related to: LU-12387 l_tunedisk does not properly handle multipath devices
• is related to: LU-12530 udev add/change rule loads zfs module on clients
• is related to: LU-9551 I/O errors when lustre uses multipath devices
• is related to: LU-9132 Tuning max_sectors_kb on mount
• is related to: LU-11563 99-lustre.rules on clients tries to execute non-existent /usr/sbin/l_tunedisk