1.一个数据区
2.一个活动登录区
3.实时运行区
blkid先查看/dev/sda2是否是xfs文件系统，是的话，可以用下面的xfs_info命令查看这个文件系统
[root@localhost proc]# xfs_info /dev/sda1 xfs_info: /dev/sda1 is not a mounted XFS filesystem [root@localhost proc]# xfs_info /dev/sda2 meta-data=/dev/sda2 isize=512 agcount=4, agsize=1159616 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=4638464, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0
