答案1
深灰色区域为 5%,为特权进程保留。有关详细说明,请参见下文。
通过更改值
$ sudo tune2fs -m 2 /dev/sdd1
tune2fs 1.42.12 (29-Aug-2014)
Setting reserved blocks percentage to 2% (38394 blocks)
看看区别
从man tune2fs
-m reserved-blocks-percentage
Set the percentage of the filesystem which may only be allocated by privileged
processes. Reserving some number of filesystem blocks for use by privileged
processes is done to avoid filesystem fragmentation, and to allow system
daemons, such as syslogd(8), to continue to function correctly after non-privileged
processes are prevented from writing to the filesystem. Normally, the default
percentage of reserved blocks is 5%.