xfs_metadump

使用如下命令备份元数据

[root@rd1 hd-8T]# xfs_metadump /dev/centos/opt ./centos-opt.metadump

使用 xfs_mdrestore 恢复数据

[root@rd1 hd-8T]# xfs_mdrestore ./centos-opt.metadump /mnt/hd-4T-part2/centos-opt.dump
[root@rd1 hd-8T]# uuidgen
dc081837-a436-4b66-a952-66e2b1143771
[root@rd1 hd-8T]# xfs_admin -U dc081837-a436-4b66-a952-66e2b1143771 /dev/loop0
Clearing log and setting UUID
writing all SBs
new UUID = dc081837-a436-4b66-a952-66e2b1143771

显示该系统的文件和文件夹，出现乱码

[root@rd1 hd-8T]# mount /dev/loop0 /mnt/opt-old/
[root@rd1 hd-8T]# ls /mnt/opt-old/
3?ogiC                h9c?w0?D  nGpzR_KspN6ry7jG8CU?[P?<  rh     UryNGb0UROC0B??CN@  XYpe??Qw?
4bonN2aujzfJamy?R??"  Hwp?u4cF  N?mmre                    ?stet  xYjaldF?Vf?]        zoom

乱码原因：xfs_metadump 参数未加上，应使用 -o

xfs_metadump -o /dev/centos/opt ./centos-opt.metadump

挂载以后

[rdu@nd1 hd-8T]$ ls /mnt/opt-new
ansys_inc  code_saturne  lammps    recoverX  SALOME-9.3.0-CO7-SRC      WindowsImageBackup
aster      google        recoverB  rh        SALOME-9.3.0-CO7-SRC.tgz  zoom

xfs_metadump 仅备份元数据，xfs_mdrestore 恢复的也只有文件夹和文件名，文件无实质内容。

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