CentOS7にMongoDBをインストールしたら以下のWarningが出た
** WARNING: Readahead for /var/lib/mongodb is set to 4096KB
** We suggest setting it to 256KB (512 sectors) or less
Tunedをつかって回避
vi /usr/lib/tuned/virtual-guest/tuned.conf
追記
[disk]
readahead=>256
有効
tuned-adm profile virtual-guest
参考にさせていただいた記事
https://access.redhat.com/documentation/ja-jp/red_hat_enterprise_linux/7/html/performance_tuning_guide/chap-red_hat_enterprise_linux-performance_tuning_guide-tuned
https://runble1.com/centos7-wordpress-tuned/