[root@rac2 ~]# tail -50 /var/log/messages 
Nov 14 19:08:54 rac2 kernel: XFS (dm-0): Metadata CRC error detected at xfs_dir3_block_read_verify+0x5e/0x110 [xfs], xfs_dir3_block block 0x305ced8
Nov 14 19:08:54 rac2 kernel: XFS (dm-0): Unmount and run xfs_repair
Nov 14 19:08:54 rac2 kernel: XFS (dm-0): First 64 bytes of corrupted metadata buffer:
Nov 14 19:08:54 rac2 kernel: ffff8830eaaae000: 31 30 31 32 30 0a 00 00 00 00 00 00 00 00 00 00  10120...........
Nov 14 19:08:54 rac2 kernel: ffff8830eaaae010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 14 19:08:54 rac2 kernel: ffff8830eaaae020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 14 19:08:54 rac2 kernel: ffff8830eaaae030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 14 19:08:54 rac2 kernel: XFS (dm-0): metadata I/O error: block 0x305ced8 ("xfs_trans_read_buf_map") error 74 numblks 8
Nov 14 19:08:54 rac2 kernel: XFS (dm-0): Metadata CRC error detected at xfs_dir3_block_read_verify+0x5e/0x110 [xfs], xfs_dir3_block block 0x305ced8
Nov 14 19:08:54 rac2 kernel: XFS (dm-0): Unmount and run xfs_repair
Nov 14 19:08:54 rac2 kernel: XFS (dm-0): First 64 bytes of corrupted metadata buffer:
Nov 14 19:08:54 rac2 kernel: ffff8830d8e53000: 31 30 31 32 30 0a 00 00 00 00 00 00 00 00 00 00  10120...........
Nov 14 19:08:54 rac2 kernel: ffff8830d8e53010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 14 19:08:54 rac2 kernel: ffff8830d8e53020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 14 19:08:54 rac2 kernel: ffff8830d8e53030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 14 19:08:54 rac2 kernel: XFS (dm-0): metadata I/O error: block 0x305ced8 ("xfs_trans_read_buf_map") error 74 numblks 8

解决办法：

由于是根盘，所以无法umount修复：

[root@rac2 ~]# xfs_repair /dev/mapper/centos-root
xfs_repair: /dev/mapper/centos-root contains a mounted filesystem
xfs_repair: /dev/mapper/centos-root contains a mounted and writable filesystem

fatal error -- couldn't initialize XFS library
[root@rac2 ~]# 

重启进入单用户模式

按e，末尾添加init=/bin/sh

按ctrl+x

然后xfs_repair -d /dev/dm-0或者xfs_repair -d /dev/mapper/centos-root

完成后，重启系统

[root@rac2 ~]# /oracle/app/19c/grid/bin/crsctl start crs
Oracle Clusterware infrastructure error in CRSCTL (OS PID 11059): Error in an OS-dependent function or service
Error category: -8, operation: access failed, location: SlfAccess, OS error: 30
OS error message: Read-only file system
Oracle Clusterware infrastructure error in CRSCTL (OS PID 11059): Unable to determine usability of ADR home path /oracle/app/grid/diag/crs/rac2/crs - error -8
CLSU-00107: operating system function: open; failed with error data: 30; at location: scrsval5
CLSU-00101: operating system error message: Read-only file system
CLSU-00104: additional error information: cant open file
CRS-4000: Command Start failed, or completed with errors.
[root@rac2 ~]# 
[root@rac2 ~]# 
[root@rac2 ~]# mount / -o rw,remount
[root@rac2 ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   47G   23G   25G  47% /
devtmpfs                 3.8G     0  3.8G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G   12M  3.8G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/sda1               1014M  146M  869M  15% /boot
tmpfs                    781M     0  781M   0% /run/user/0
[root@rac2 ~]# vi 1.txt

dldl
~
~
~
"1.txt" [New] 1L, 5C written
[root@rac2 ~]# ps -ef|grep d.bin
root      11257  10938  0 19:55 pts/0    00:00:00 grep --color=auto d.bin
[root@rac2 ~]# /oracle/app/19c/grid/bin/crsctl start crs
CRS-4123: Oracle High Availability Services has been started.