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今天上了個Oracle存儲數(shù)據(jù)備份還原掛載存儲新硬盤，裝完系統(tǒng)后讓機房技術(shù)把舊硬盤掛上去，我們這邊遠程操作拷貝數(shù)據(jù)到新的硬盤上面，在mount /dev/sda2 /mnt的時候，提示“mount: /dev/sda2 already mounted or /mnt busy ” 查證/dev/sda2沒有被掛載/mnt也沒有在使用

 #fdisk -l /dev/sda
 Disk /dev/sda: 320.0 GB, 320072933376 bytes
 255 heads, 63 sectors/track, 38913 cylinders
 Units = cylinders of 16065 * 512 = 8225280 bytes
 Device Boot Start End Blocks Id System
 /dev/sda1 * 1 13 104391 83 Linux
 /dev/sda2 14 38913 312464250 8e Linux LVM
 是lvm分區(qū)，這種不能直接被掛載。
 正確掛載流程：
 #fdisk -lu /dev/sda

Disk /dev/sda: 320.0 GB, 320072933376 bytes
 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
 Units = sectors of 1 * 512 = 512 bytes
 
Device Boot Start End Blocks Id System
 /dev/sda1 * 63 208844 104391 83 Linux
 /dev/sda2 208845 625137344 312464250 8e Linux LVM
 //從上看出lvm分區(qū)起始于208845扇區(qū)，把這個地址處的分區(qū)mount為loop設(shè)備：
 #losetup -f -o $[208845*512] /dev/sda2
 #losetup -a
 /dev/loop0: [0011]:1050 (/dev/sda2), offset 106928640
 # lvm pvscan //掃描lvm volumns:
 
PV /dev/sda2 VG VolGroup00 lvm2 [297.97 GB / 0 free]
 Total: 1 [297.97 GB] / in use: 1 [297.97 GB] / in no VG: 0 [0 ]
 # lvm vgchange -ay //激活lvm volumn
 2 logical volume(s) in volume group "VolGroup00" now active
 # ls /dev/mapper/ //查看激活后的分區(qū)名稱
 control VolGroup00-LogVol00 VolGroup00-LogVol01
 # lvm lvs 查看大小
 LV VG Attr LSize Origin Snap% Move Log Copy% Convert
 LogVol00 VolGroup00 -wi-a- 296.03G
LogVol01 VolGroup00 -wi-a- 1.94G
# mount /dev/mapper/VolGroup00-LogVol00 /mnt
 這樣就掛載上去了