redhat linux下认不到盘阵的解决步骤
redhat linux下认不到盘阵的解决步骤（转自cu）
2009-04-24 08:33
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周六时服务器关机，今天早上服务器开机时，发现日立盘阵找不到了，上面做了逻辑卷，生成了/dev/mapper/vgams-lvams设备文件的，但是今早上发现这个文件没有了，用pvdisplay命令查看发现原来生成的一个pv的pv name认不到了。请问现在这种情况应该怎么处理，有什么办法在不损伤盘阵上数据的情况下重新生成mapper目录下的那个设备文件？或者如何才能备份出里面的数据呢？谢谢各位大侠救急了！！！！
[root@io01 etc]# pvdisplay Couldn't find device with uuid 'nsLqhQ-7new-6cSe-EWQz-kusd-U2Ht-zJ2joY'. ====> 就是丢失的/dev/sdb1这个pv的uuid ...... Couldn't find device with uuid 'nsLqhQ-7new-6cSe-EWQz-kusd-U2Ht-zJ2joY'. Couldn't find device with uuid 'nsLqhQ-7new-6cSe-EWQz-kusd-U2Ht-zJ2joY'. --- Physical volume --- PV Name /dev/sdc1 VG Name vgams PV Size 975.11 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 4096 Total PE 249629 Free PE 0 Allocated PE 249629 PV UUID y8Uxl5-pk5g-fed8-fpKG-mHde-nCyF-luYddV ...... --- Physical volume --- PV Name /dev/sdi1 VG Name vgams PV Size 975.11 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 4096 Total PE 249629 Free PE 0 Allocated PE 249629 PV UUID BjDowe-lqey-Uc1J-15BY-fPsC-yLfT-upSLgt --- Physical volume --- PV Name unknown device ====> 这里pv 名字找不到了，原本应该是/dev/sdb1 VG Name vgams PV Size 899.99 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 4096 Total PE 230398 Free PE 0 Allocated PE 230398 PV UUID nsLqhQ-7new-6cSe-EWQz-kusd-U2Ht-zJ2joY [root@io01 etc]#
终于解决了，就是分区表的问题，恢复一下分区表就可以了。在这里感谢各位兄弟姐妹的支持和帮助，尤其感谢jerrywjl 大侠耐心的指导！再次感谢！！
下面是我最终的解决过程： 1、首先导出正常pv的分区表，并做相应修改，然后恢复不正常pv的分区表： [root@io01 home]# fdisk -l /dev/sdb ==> 分区表乱七八糟！ Disk /dev/sdb: 966.3 GB, 966367641600 bytes 255 heads, 63 sectors/track, 117487 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 ? 264386 257082 2088818490 1 FAT12 Partition 1 does not end on cylinder boundary. /dev/sdb2 ? 66852 51358 2023024920+ 42 SFS Partition 2 does not end on cylinder boundary. /dev/sdb3 ? 105920 105961 329394 6f Unknown Partition 3 does not end on cylinder boundary. /dev/sdb4 87045 154994 545800106+ 49 Unknown Partition 4 does not end on cylinder boundary. Partition table entries are not in disk order [root@io01 home]# sfdisk -d /dev/sdd > sdd-table ===> 导出正常pv的分区表 [root@io01 home]# sed 's/sdd/sdb/g' sdd-table > sdb-table ===> 修改分区表中的sdd为sdb [root@io01 home]# sfdisk /dev/sdb < sdb-table ===> 恢复丢失pv的分布表 Checking that no-one is using this disk right now ... OK Disk /dev/sdb: 117487 cylinders, 255 heads, 63 sectors/track Old situation: Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sdb1 ? 264385+ 524430- 260046- 2088818490 1 FAT12 start: (c,h,s) expected (1023,254,63) found (124,38,11) end: (c,h,s) expected (1023,254,63) found (344,195,26) /dev/sdb2 ? 66851+ 318706- 251855- 2023024920+ 42 SFS start: (c,h,s) expected (1023,254,63) found (453,241,50) end: (c,h,s) expected (1023,254,63) found (26,59,22) /dev/sdb3 ? 105919+ 105960- 42- 329394 6f Unknown start: (c,h,s) expected (1023,254,63) found (367,183,2) end: (c,h,s) expected (1023,254,63) found (102,116,32) /dev/sdb4 87044+ 154993- 67949- 545800106+ 49 Unknown start: (c,h,s) expected (1023,254,63) found (332,76,4) end: (c,h,s) expected (1023,254,63) found (344,78,21) New situation: Units = sectors of 512 bytes, counting from 0 Device Boot Start End #sectors Id System /dev/sdb1 63 1887428654 1887428592 8e Linux LVM /dev/sdb2 0 - 0 0 Empty /dev/sdb3 0 - 0 0 Empty /dev/sdb4 0 - 0 0 Empty Warning: no primary partition is marked bootable (active) This does not matter for LILO, but the DOS MBR will not boot this disk. Successfully wrote the new partition table Re-reading the partition table ... If you created or changed a DOS partition, /dev/foo7, say, then use dd(1) to zero the first 512 bytes: dd if=/dev/zero of=/dev/foo7 bs=512 count=1 (See fdisk(  .)
[root@io01 home]# 2、接下来一步是很重要的一步，恢复pv，首先要查看丢失pv的uuid： [root@io01 home]# lvs -a -o +devices ===> 查看丢失卷的uuid Couldn't find device with uuid 'nsLqhQ-7new-6cSe-EWQz-kusd-U2Ht-zJ2joY'. Couldn't find all physical volumes for volume group vgams. Couldn't find device with uuid 'nsLqhQ-7new-6cSe-EWQz-kusd-U2Ht-zJ2joY'. Couldn't find all physical volumes for volume group vgams. ...... [root@io01 home]# pvcreate --uuid "nsLqhQ-7new-6cSe-EWQz-kusd-U2Ht-zJ2joY" --restorefile /etc/lvm/archive/vgams_00000.vg /dev/sdb1 ===> 重写lvm元数据区，注意一定要用正确的uuid，该项操作不会影响到lvm的数据区，即不会损害数据 Couldn't find device with uuid 'nsLqhQ-7new-6cSe-EWQz-kusd-U2Ht-zJ2joY'. Physical volume "/dev/sdb1" successfully created 3、恢复卷组、逻辑卷，并挂载到相应目录： [root@io01 home]# vgcfgrestore vgams ===> 恢复卷组 Restored volume group vgams [root@io01 home]# lvs -a -o +devices LV VG Attr LSize Origin Snap% Move Log Copy% Devices lvams vgams -wi--- 7.32T /dev/sdc1(0) lvams vgams -wi--- 7.32T /dev/sde1(0) lvams vgams -wi--- 7.32T /dev/sdg1(0) lvams vgams -wi--- 7.32T /dev/sdi1(0) lvams vgams -wi--- 7.32T /dev/sdd1(0) lvams vgams -wi--- 7.32T /dev/sdf1(0) lvams vgams -wi--- 7.32T /dev/sdh1(0) lvams vgams -wi--- 7.32T /dev/sdb1(0) [root@io01 home]# ls /dev/vgams ls: /dev/vgams: No such file or directory [root@io01 home]# lvchange -ay /dev/vgams/lvams ===> 启用卷，注意在这步之前/dev/vgams/lvams是没有的 [root@io01 home]# lvs -a -o +devices LV VG Attr LSize Origin Snap% Move Log Copy% Devices lvams vgams -wi-a- 7.32T /dev/sdc1(0) lvams vgams -wi-a- 7.32T /dev/sde1(0) lvams vgams -wi-a- 7.32T /dev/sdg1(0) lvams vgams -wi-a- 7.32T /dev/sdi1(0) lvams vgams -wi-a- 7.32T /dev/sdd1(0) lvams vgams -wi-a- 7.32T /dev/sdf1(0) lvams vgams -wi-a- 7.32T /dev/sdh1(0) lvams vgams -wi-a- 7.32T /dev/sdb1(0) [root@io01 home]# ls /dev/vgams/lvams /dev/vgams/lvams [root@io01 home]# mount /dev/vgams/lvams /vol ===> 挂载卷 [root@io01 home]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 20G 13G 5.8G 69% / none 3.9G 0 3.9G 0% /dev/shm /dev/sda5 130G 16G 108G 13% /home /dev/sda2 20G 454M 19G 3% /var /dev/sda3 99G 6.6G 87G 8% /soft /dev/mapper/vgams-lvams 7.3T 3.1T 4.2T 43% /vol |