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国庆节期间接到朋友咨询,原先在vg中的磁盘被重新pvcreate了,想恢复原磁盘中的mysql数据库
通过分析系统的history日志,发现操作不是简单的pvcreate,我简单梳理下操作步骤
故障之前磁盘情况
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [root@0002 ~]``# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 1024M 0 rom vda 253:0 0 200G 0 disk ├─vda1 253:1 0 600M 0 part ``/boot/efi ├─vda2 253:2 0 1G 0 part ``/boot └─vda3 253:3 0 38.4G 0 part ``├─klas-root 252:0 0 34.4G 0 lvm / ``└─klas-swap 252:1 0 4G 0 lvm [SWAP] vdb 253:16 0 1000G 0 disk └─vdb1 253:17 0 500G 0 part ``└─mysql-mysql--mycg 252:2 0 500G 0 lvm ``/mysql |
这里可以看到出来vdb磁盘一共1000G,分区vdb1 为500G,然后这500G加入到vg中并分配了lv.
vdb磁盘现状
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [root@0002 mysql]``# lsblk /dev/vdb NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vdb 253:16 0 1000G 0 disk └─vdb1 253:17 0 1000G 0 part Disk ``/dev/vdb``: 1000 GiB, 1073741824000 bytes, 2097152000 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical``/physical``): 512 bytes / 512 bytes I``/O size (minimum``/optimal``): 512 bytes / 512 bytes Disklabel ``type``: dos Disk identifier: 0x5a6aaeee Device Boot Start End Sectors Size Id Type /dev/vdb1 2048 2097151999 2097149952 1000G 8e Linux LVM |
这里基本上可以确定,vdb1磁盘分区从以前的500G变成了1000G（也就是说被重新分区了,后续和现场沟通确认进行了重新分区操作）
通过history日志追述大概的操作过程
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 898 [2025-09-28 11:55:13][root]``fdisk -l 899 [2025-09-28 11:55:21][root]``df -h 900 [2025-09-28 11:56:41][root]lsblk 901 [2025-09-28 11:59:44][root]``fdisk /dev/vdb 902 [2025-09-28 12:00:46][root]partprobe ``/dev/vdb 903 [2025-09-28 12:00:50][root]pvresize ``/dev/vdb1 904 [2025-09-28 12:00:56][root]``df -h 905 [2025-09-28 12:01:25][root]vgdisplay mysql 906 [2025-09-28 12:01:40][root]lsblk 907 [2025-09-28 12:02:05][root]``sudo partprobe ``/dev/vdb 908 [2025-09-28 12:02:10][root]pvresize ``/dev/vdb1 909 [2025-09-28 12:02:27][root]``sudo pvresize ``/dev/vdb1 910 [2025-09-28 12:03:07][root]``sudo pvcreate ``/dev/vdb1 911 [2025-09-28 12:03:22][root]``sudo pvscan 912 [2025-09-28 12:03:30][root]``sudo pvdisplay 913 [2025-09-28 12:05:37][root]parted ``/dev/vdb 914 [2025-09-28 12:06:11][root]pvresize ``/dev/vdb1 915 [2025-09-28 12:06:15][root]lsblk 916 [2025-09-28 12:09:48][root]lvextend -l +100%FREE ``/dev/mysql/mysql--mycg 917 [2025-09-28 12:10:00][root]``cd /dev/mysql/ 918 [2025-09-28 12:10:01][root]ll 919 [2025-09-28 12:10:20][root]``pwd 920 [2025-09-28 12:10:32][root]lvextend -l +100%FREE ``/dev/mysql/mysql-mycg 921 [2025-09-28 12:10:55][root]lsblk ``/dev/vdb |
基本上可以确定9月28日先进行了fdisk分区操作,然后尝试pvresize 操作[应该不会成功,因为重新分区导致pv信息丢失],然后进行了pvcreate之后再次进行parted分区操作,再pvresize,lvextend操作[同理pv信息丢失应该不会成功],然后10月5日继续进行的部分操作
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 956 [2025-10-05 08:29:27][root]``umount /mysql 957 [2025-10-05 08:29:38][root]``lsof /mysql 958 [2025-10-05 08:29:58][root]service mysqld stop 959 [2025-10-05 08:30:02][root]``umount /mysql 960 [2025-10-05 08:30:05][root]``lsof /mysql 961 [2025-10-05 08:30:23][root]``cd / 962 [2025-10-05 08:30:25][root]``umount /mysql 963 [2025-10-05 08:30:34][root]pvcreate --force ``/dev/vdb1 964 [2025-10-05 08:30:47][root]vgextend mysql ``/dev/vdb1 965 [2025-10-05 08:31:02][root]``df -h 966 [2025-10-05 08:31:33][root]pvdisplay ``/dev/vdb1 967 [2025-10-05 08:31:41][root]pvcreate --force ``/dev/vdb1 968 [2025-10-05 08:32:11][root]lvs | ``grep mysql-mysql--mycg 969 [2025-10-05 08:32:19][root]dmsetup ``ls | ``grep mysql 970 [2025-10-05 08:32:38][root]fuser ``/dev/vdb1 971 [2025-10-05 08:32:41][root]``lsof /dev/vdb1 972 [2025-10-05 08:32:50][root]pvcreate --force ``/dev/vdb1 973 [2025-10-05 08:33:14][root]reboot 974 [2025-10-05 08:36:23][root]pvcreate --force ``/dev/vdb1 975 [2025-10-05 08:36:47][root]lvdisplay ``/dev/mapper/mysql-mysql--mycg 976 [2025-10-05 08:36:53][root]vgextend mysql ``/dev/vdb1 977 [2025-10-05 08:37:10][root]lvextend -l +100%FREE ``/dev/mysql/mysql--mycg |
初步看,应该是先尝试umount /dev/vdb1,但是没有成功,然后直接reboot重启了主机,起来之后,进行了pvcreate[操作成功],vgextend,lvextend等操作[失败,因为vg里面的之前的pv信息已经丢失],而且之前lv无法mount成功,数据库文件/备份均在这个lv里面,而且从库很久之前没有正常同步.基于这样的情况,就一定要对vdb磁盘中数据进行恢复.查看操作系统信息,确认是arm系统
由于arm系统一般工具均无法正常解析,只能让客户把磁盘挂载到x86环境进行处理,通过专业恢复工具解析,运气不错可以直接读取数据
传输数据到客户服务器中,并成功启动mysql,客户测试业务没有任何问题,数据完整恢复
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