[LU-14412] changing max_read_ahead_whole_mb results in error "Numerical result out of range? "

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Affects Version/s: Lustre 2.12.5
• Severity: 3
• Assignee: Yang Sheng
• Reporter: Mahmoud Hanafi

Description

Trying to change client side max_read_ahead_whole_mb setting returns error. 

r633i6n8 ~ # lctl get_param llite.nbp12-ffff95b4806d1800.max_read_ahead_mb
llite.nbp12-ffff95b4806d1800.max_read_ahead_mb=4096
r633i6n8 ~ # lctl set_param llite.nbp12-ffff95b4806d1800.max_read_ahead_whole_mb=512
error: set_param: setting /sys/kernel/debug/lustre/llite/nbp12-ffff95b4806d1800/max_read_ahead_whole_mb=512: Numerical result out of range?