[LU-14717] osd-ldiskfs: set od_readcache_max_filesize with maximal value when setting with negative value via lproc

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: Qian Yingjin
• Reporter: Qian Yingjin

Description

# echo -n -1 > /proc/fs/lustre/osd-ldiskfs/lustre0-MDT0000/readcache_max_filesize
-bash: echo: write error: Numerical result out of range

To disable the maximum cached file size on an OST, run:
 root@oss1# lctl set_param obdfilter.{OST_name}.readcache_max_filesize=-1
To check the current maximum cached file size on all OSTs of an OSS, run:
 root@oss1# lctl get_param obdfilter.*.readcache_max_filesize

It would better to set readcache_max_filesize with maximal value when setting with negative value via lproc.