[ 7947.411100] quiet_error: 302 callbacks suppressed

[ 7947.411104] Buffer I/O error on device dm-0, logical block 8388592

[ 7947.417259] Buffer I/O error on device dm-0, logical block 8388606

[ 7947.423075] Buffer I/O error on device dm-0, logical block 0

[ 7947.428460] Buffer I/O error on device dm-0, logical block 1

[ 7947.433874] Buffer I/O error on device dm-0, logical block 8388607

[ 7947.438913] Buffer I/O error on device dm-0, logical block 8388607

[ 7947.443858] Buffer I/O error on device dm-0, logical block 8388607

[ 7947.448453] Buffer I/O error on device dm-0, logical block 8388607

[ 7947.453017] Buffer I/O error on device dm-0, logical block 8388607

[ 7947.457511] Buffer I/O error on device dm-0, logical block 8388607

[root@andromeda ~]# dmsetup info /dev/dm-0

Name: Raid-SWAP-missing_0_0

State: ACTIVE

Read Ahead: 0

Tables present: LIVE

Open count: 0

Event number: 0

Major, minor: 253, 0

Number of targets: 1

UUID: LVM-cMT37xI3NuSKcNxeRKwylu1lgZU7ki0zdFHdYOHEEjXWLFc3bGvDPyq3kwjuSRVT-missing_0_0

lvm会把每个lv连接到一个/dev/dm-x的设备档，

这个设备档并不是一个真正的磁盘，当然不会有分区表存在了，

所以这也不算是错误信息。其实用lvm挺方面的，fedora的安装手册就建议分出boot和swap后把剩下的空间全分到lvm，

 这样以后就不用担心分区会分小或分大的问题，很方面的 

dm-0基本概念和损坏