[bug-fdisk] terrible problem with fdisk on on GPT partition. help needed!!!

[zhxt]

hi, all

I have got a terrible problem now, I had used fdisk created 2 new partition on an GPT format partition of a sever,

and that patition is an LVM partition. After fdisk finished, I realized things goes wrong.

But the partition table had changed already.

Could I get them back without data loss, the data is very important for me.

The thing is the disk on my server is 7T, but just  1T is used(3 lvm partition ), So I use fdisk create another 2 partition.

1. b4 fdisk:
2.  
3. 255 heads, 63 sectors/track, 963658 cylinders, total 15481176192 sectors
4. Units = sectors of 1 * 512 = 512 bytes
5. Sector size (logical/physical): 512 bytes / 512 bytes
6. I/O size (minimum/optimal): 512 bytes / 512 bytes
7. Disk identifier: 0x00000000
8.  
9.    Device Boot      Start         End      Blocks   Id  System
10. /dev/sdb1            2048      321535      159744   83  Linux
11. /dev/sdb4               1           1           0+  ee  GPT
12.  
13. Partition table entries are not in disk order
14.  
15. after fdisk:
16.  
17. Command (m for help): p
18.  
19. Disk /dev/sdb: 7926.4 GB, 7926362210304 bytes
20. 255 heads, 63 sectors/track, 963658 cylinders, total 15481176192 sectors
21. Units = sectors of 1 * 512 = 512 bytes
22. Sector size (logical/physical): 512 bytes / 512 bytes
23. I/O size (minimum/optimal): 512 bytes / 512 bytes
24. Disk identifier: 0x00000000
25.  
26.    Device Boot      Start         End      Blocks   Id  System
27. /dev/sdb1            2048      321535      159744   83  Linux
28. /dev/sdb2          321536  1996810239   998244352   83  Linux
29. /dev/sdb3      1996810240  4294967294  1149078527+  83  Linux
30. /dev/sdb4               1           1           0+  ee  GPT
31.  
32. Partition table entries are not in disk order

before and after fdisk, the output of lsblk is the same.

1. # partprobe
2. # lsblk
3. NAME                   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
4. sda                      8:0    0  1000G  0 disk
5. sdb                      8:16   0   7.2T  0 disk
6. ├─sdb1                   8:17   0   156M  0 part /boot
7. └─sdb2                   8:18   0   7.2T  0 part
8.   ├─system-home (dm-0) 253:0    0   600G  0 lvm  /home
9.   ├─system-root (dm-1) 253:1    0   400G  0 lvm  /
10.   └─system-swap (dm-2) 253:2    0     2G  0 lvm  [SWAP]
11. sr0                     11:0    1  1024M  0 rom  
12. wnobshost:/home/cmos # ls /dev/sdb*
13. /dev/sdb  /dev/sdb1  /dev/sdb2

sdb3 and sdb4 does not  shown,  now all data can accessed. but I'm afraid of  it can not be booted .

Is it possible to recover the GPT partition table back?
What should I do now?


Many many thanks!

Br,
Xingtao Zhang