格式 EXT4 6i单盘也得RAID之后，TRIM功能失效 查看trim支持 ``` hdparm -I /dev/sdb | grep TRIM ``` ``` Data Set Management TRIM supported (limit 8 blocks) ``` ``` vim /etc/fstab ``` ``` /dev/sdb1 /mntdir ext4 discard,noatime,nodiratime,errors=remount-ro 0 0 ```