wipsfs 擦除磁盘签名后恢复分区
wipsfs 擦除磁盘签名后恢复分区
误操作使用 wipefs 命令清理的磁盘，ansible执行的没有以下返回值，如果有以下信息可以使用其他方法恢复
1 2 | wipefs -a -f /dev/sdb /dev/sdb: 8 bytes were erased at offset 0x00000218 (LVM2_member): 4c 56 4d 32 20 30 30 31 |
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执行 wipefs 后 pv 、vg、lvm 都没有了，但是分区挂载还在
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # pvs # vgs # lvs # df -h Filesystem Size Used Avail Use% Mounted on udev 472M 0 472M 0% /dev tmpfs 98M 1.2M 97M 2% /run /dev/sda1 9.6G 1.7G 7.9G 18% / tmpfs 489M 0 489M 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 489M 0 489M 0% /sys/fs/cgroup /dev/loop0 64M 64M 0 100% /snap/core20/1623 /dev/sda15 105M 5.2M 100M 5% /boot/efi /dev/mapper/datavg-lv_data1 10G 104M 9.9G 2% /data1 /dev/mapper/datavg-lv_data2 9.0G 97M 8.9G 2% /data2 |
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取消 /etc/fstab 中的挂载，重启主机
1 2 3 4 5 6 7 | # cat /etc/fstab LABEL=cloudimg-rootfs / ext4 defaults 0 1 LABEL=UEFI /boot/efi vfat umask=0077 0 1 #/dev/mapper/datavg-lv_data1 /data1 xfs defaults 0 0 #/dev/mapper/datavg-lv_data2 /data2 xfs defaults 0 0 # reboot |
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查看备份的 disk uuid，记录 pv0 的id
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | # cat /etc/lvm/backup/datavg # Generated by LVM2 version 2.03.07(2) (2019-11-30): Tue Nov 15 07:06:15 2022 contents = "Text Format Volume Group" version = 1 description = "Created *after* executing 'vgs'" creation_host = "ubuntuguest" # Linux ubuntuguest 5.4.0-131-generic #147-Ubuntu SMP Fri Oct 14 17:07:22 UTC 2022 x86_64 creation_time = 1668495975 # Tue Nov 15 07:06:15 2022 datavg { id = "biPpie-lyHv-R7Og-u9OH-Z5S2-jVyp-hhZb5e" seqno = 7 format = "lvm2" # informational status = ["RESIZEABLE", "READ", "WRITE"] flags = [] extent_size = 8192 # 4 Megabytes max_lv = 0 max_pv = 0 metadata_copies = 0 physical_volumes { pv0 { id = "5rcocK-1vg0-fzR3-R2dW-ZbVO-eupP-fVf7sB" device = "/dev/sdb" # Hint only status = ["ALLOCATABLE"] flags = [] dev_size = 41943040 # 20 Gigabytes pe_start = 2048 pe_count = 5119 # 19.9961 Gigabytes } } logical_volumes { lv_data1 { id = "OQ3Kqs-tdLh-0ooG-mhhO-wKVU-ekP2-SecDaA" status = ["READ", "WRITE", "VISIBLE"] flags = [] creation_time = 1668167654 # 2022-11-11 11:54:14 +0000 creation_host = "ubuntuguest" segment_count = 1 segment1 { start_extent = 0 extent_count = 2560 # 10 Gigabytes type = "striped" stripe_count = 1 # linear stripes = [ "pv0", 0 ] } } lv_data2 { id = "sFNqz2-e0qH-we8k-p5t7-j8yt-d5oT-GWX2QF" status = ["READ", "WRITE", "VISIBLE"] flags = [] creation_time = 1668167667 # 2022-11-11 11:54:27 +0000 creation_host = "ubuntuguest" segment_count = 1 segment1 { start_extent = 0 extent_count = 2304 # 9 Gigabytes type = "striped" stripe_count = 1 # linear stripes = [ "pv0", 2560 ] } } } } |
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恢复 pv
1 2 3 4 | # /etc/lvm/backup/datavg 是最新的一次 datavg 的备份，历史备份位于 /etc/lvm/archive/ # pvcreate --uuid '5rcocK-1vg0-fzR3-R2dW-ZbVO-eupP-fVf7sB' --restorefile '/etc/lvm/backup/datavg' /dev/sdb WARNING: Couldn't find device with uuid 5rcocK-1vg0-fzR3-R2dW-ZbVO-eupP-fVf7sB. Physical volume "/dev/sdb" successfully created. |
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恢复vg
1 2 | # vgcfgrestore -f /etc/lvm/backup/datavg datavg Restored volume group datavg. |
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重启 lvm2-pvscan 服务
1 2 | # 多个 pv 可能有多个 lvm2-pvscan 服务，可以查看服务的日志确定其对应哪个 pv systemctl restart lvm2-pvscan@8\\:16.service |
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取消 fstab 文件注释，重启挂载
1 2 3 4 5 6 7 | # cat /etc/fstab LABEL=cloudimg-rootfs / ext4 defaults 0 1 LABEL=UEFI /boot/efi vfat umask=0077 0 1 /dev/mapper/datavg-lv_data1 /data1 xfs defaults 0 0 /dev/mapper/datavg-lv_data2 /data2 xfs defaults 0 0 # mount -a |
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验证，成功恢复pv，vg，lvm
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | # pvs PV VG Fmt Attr PSize PFree /dev/sdb datavg lvm2 a-- <20.00g 1020.00m # vgs VG #PV #LV #SN Attr VSize VFree datavg 1 2 0 wz--n- <20.00g 1020.00m # lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_data1 datavg -wi-ao---- 10.00g lv_data2 datavg -wi-ao---- 9.00g # df -h Filesystem Size Used Avail Use% Mounted on udev 472M 0 472M 0% /dev tmpfs 98M 1.2M 97M 2% /run /dev/sda1 9.6G 1.7G 7.9G 18% / /dev/loop0 68M 68M 0 100% /snap/lxd/22753 /dev/sda15 105M 5.2M 100M 5% /boot/efi /dev/mapper/datavg-lv_data1 10G 104M 9.9G 2% /data1 /dev/mapper/datavg-lv_data2 9.0G 97M 8.9G 2% /data2 |
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