磁盘异常警报，使用率100%，进入服务器查看如下：
进入/目录使用du -sh * 查看没用发现占用空间过大的目录和文件，如下图：
继续使用df -i 查看inode使用率，如下：
Filesystem Inodes IUsed IFree IUse% Mounted on /dev/vda1 1310720 65510 1245210 5% / tmpfs 2041788 4 2041784 1% /dev/shm /dev/vdb 13107200 193203 12913997 2% /data
inode 的使用并不高，后来想到是不是文件删除之后还有进程在占用？于是使用lsof -a |grep delete,没有发现进程！！！
后来问了别人才知道，带-a参数的问题（-a是打开文件存在的进程，已经删除了的文件不存在，所以就不显示了）
之后使用lsof |grep delete 发现如下：
mysqld 1365 mysql 5u REG 252,1 0 1053371 /tmp/ibL8JChM (deleted) mysqld 1365 mysql 6u REG 252,1 0 1053372 /tmp/ibyBlPxh (deleted) mysqld 1365 mysql 7u REG 252,1 0 1053373 /tmp/ibB2f2NM (deleted) mysqld 1365 mysql 8u REG 252,1 0 1053374 /tmp/ibKYgw5h (deleted) mysqld 1365 mysql 12u REG 252,1 0 1053375 /tmp/ibbAeeIN (deleted) epmd 11615 root txt REG 252,16 151869 7864360 /data/xx_server/dbm/erts-5.10.1/bin/epmd (deleted) beam.smp 15629 root 0u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15629 root 1u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15629 root 2u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15647 root 0u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15647 root 1u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15647 root 2u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15670 root 0u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15670 root 1u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15670 root 2u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15693 root 0u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15693 root 1u CHR 136,1 0t0 4 /dev/pts/1 (deleted) beam.smp 15693 root 2u CHR 136,1 0t0 4 /dev/pts/1 (deleted)
kill 掉所有的进程之后，磁盘空间恢复正常！