昨天我的 CentOS Linux 7 (Core) 服务器出现硬盘问题。硬盘现已更换，但主分区处于只读模式。
我正在尝试让主分区再次可用（使其可读写）但遇到了很多问题。
挂载为 rw
我尝试过mount -n -o remount,rw /但结果却是：
mount: / not mounted or bad option
In some cases useful info is found in syslog - try
dmesg | tail or so
dmesg | tail导致：
[ 177.305240] Loading iSCSI transport class v2.0-870.
[ 177.419722] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
[ 177.446940] NFSD: starting 90-second grace period (net ffffffffa32fca00)
[ 233.475427] systemd-readahead[2002]: Failed to open pack file: Read-only file system
[ 267.629924] nfsd4: failed to purge old clients from recovery directory v4recovery
[ 428.141830] EXT4-fs (md2): error count since last fsck: 1
[ 428.141889] EXT4-fs (md2): initial error at time 1542775899: ext4_xattr_block_get:298: inode 6947097
[ 428.142014] EXT4-fs (md2): last error at time 1542775899: ext4_xattr_block_get:298: inode 6947097
[ 748.786866] EXT4-fs (md2): Couldn't remount RDWR because of unprocessed orphan inode list. Please umount/remount instead
[ 770.787648] EXT4-fs (md2): Couldn't remount RDWR because of unprocessed orphan inode list. Please umount/remount instead
e2fsck
我尝试使用以下方法修复孤立的 inode 列表：
e2fsck -f /dev/md2
e2fsck 1.42.9 (28-Dec-2013)
/dev/md2 has unsupported feature(s): metadata_csum
e2fsck: Get a newer version of e2fsck!
由于文件系统处于只读模式，我无法下载较新版本的e2fsck。
tune2fs
我尝试tune2fs -O ^metadata_csum /dev/md2并得到：
tune2fs 1.42.9 (28-Dec-2013)
tune2fs: Filesystem has unsupported read-only feature(s) while trying to open /dev/md2
Couldn't find valid filesystem superblock.
我怎样才能让该分区再次被读写？
谢谢
答案1
您需要从足够新的救援系统启动，以支持您正在使用的文件系统功能。但是，考虑到文件系统显然已损坏，即使（我假设）您使用的是提供冗余的 RAID 级别，也要做好文件系统无法恢复的准备。是时候预热备份了。