修復被刪除的磁盤鏈接文件和更新存儲信息。無需重啓服務器。
刪除/dev/sda後
查看/dev/sd開頭的設備：
# ll /dev/sd*
brw-r----- 1 root disk 8, 16 06-12 20:25 /dev/sdb
查看本機磁盤信息：
# fdisk -l
Disk /dev/vda: 10.4 GB, 10485760000 bytes
255 heads, 63 sectors/track, 1274 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/vda1 * 1 13 104391 83 Linux
/dev/vda2 14 1274 10128982+ 8e Linux LVM
Disk /dev/sdb: 8589 MB, 8589934592 bytes
64 heads, 32 sectors/track, 8192 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk /dev/sdb doesn't contain a valid partition table
備註：
只剩下/dev/sdb。容量8GB。
重新掃描/dev/sdb容量：
1、清除/dev/sdb現有信息：
# echo 1 > /sys/block/sdb/device/delete
2、重新掃描/dev/sdb磁盤信息：
# echo "- - -" > /sys/class/scsi_host/host0/scan
# echo "- - -" > /sys/class/scsi_host/host1/scan
查看現有磁盤信息：
# fdisk -l
Disk /dev/vda: 10.4 GB, 10485760000 bytes
255 heads, 63 sectors/track, 1274 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/vda1 * 1 13 104391 83 Linux
/dev/vda2 14 1274 10128982+ 8e Linux LVM
Disk /dev/sdb: 12.8 GB, 12884901888 bytes
64 heads, 32 sectors/track, 12288 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk /dev/sdb doesn't contain a valid partition table
備註：磁盤/dev/sdb信息已經更新。
=========================================================================
創建被刪除的/dev/sda設備鏈接：
# /dev/MAKEDEV sda
查看現有磁盤信息：
# fdisk -l
Disk /dev/vda: 10.4 GB, 10485760000 bytes
255 heads, 63 sectors/track, 1274 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/vda1 * 1 13 104391 83 Linux
/dev/vda2 14 1274 10128982+ 8e Linux LVM
Disk /dev/sda: 8589 MB, 8589934592 bytes
64 heads, 32 sectors/track, 8192 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk /dev/sda doesn't contain a valid partition table
Disk /dev/sdb: 12.8 GB, 12884901888 bytes
64 heads, 32 sectors/track, 12288 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk /dev/sdb doesn't contain a valid partition table
備註：磁盤/dev/sda已經恢復，但是容量錯誤。
重新掃描/dev/sda信息：
1、清除/dev/sdb現有信息：
# echo 1 > /sys/block/sda/device/delete
2、重新掃描/dev/sdb磁盤信息：
# echo "- - -" > /sys/class/scsi_host/host0/scan
# echo "- - -" > /sys/class/scsi_host/host1/scan
結果：
修復成功：
# fdisk -l
Disk /dev/vda: 10.4 GB, 10485760000 bytes
255 heads, 63 sectors/track, 1274 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/vda1 * 1 13 104391 83 Linux
/dev/vda2 14 1274 10128982+ 8e Linux LVM
Disk /dev/sdb: 12.8 GB, 12884901888 bytes
64 heads, 32 sectors/track, 12288 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk /dev/sdb doesn't contain a valid partition table
Disk /dev/sda: 12.8 GB, 12884901888 bytes
64 heads, 32 sectors/track, 12288 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk /dev/sda doesn't contain a valid partition table
====================================================================
使用下列命令後，除了生成需要的/dev/sda外還生成大量其它以sda開頭的文件：
# /dev/MAKEDEV sda
使用下列命令刪除無用設備鏈接文件：
# rm -f `ls /dev/sda*|grep -v "sda$"`