How to restore disk partition after unsuccessful use of sgdisk?

Question

RAID

I wanted to copy the disk layout with the sgdisk command and mixed up the arguments and erased the partition table. But before that I ran fdisk -l:

spoiler

Device Start End Sectors Size Type
/dev/sda1 2048 1026047 1024000 500M Linux RAID
/dev/sda2 1026048 105883647 104857600 50G Linux RAID
/dev/sda3 105883648 105887743 4096 2M BIOS boot
/dev/sda4 105887744 5860533134 5754645391 2.7T Linux RAID

those. the disk structure is preserved. The question is how to recreate it without loss? The server hasn't rebooted yet. I tried the cfdisk utility, but it only managed to make the 1st 3 partitions:

spoiler

Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 1026047 1024000 500M fd Linux raid autodetect
/dev/sda2 1026048 105883647 104857600 50G 83 Linux
/dev/sda3 * 105883648 105887743 4096 2M 83 Linux

and the last one, which 2.7Tb does not work out, cuts 2TB each and that's it.

Answer 1

Resolved the issue. Based on the existing disk layout, I created the same one on both disks via cfdisk. Include disk partitions in an array:

mdadm --manage /dev/md0 --add /dev/sdba
.....

I waited for synchronization, just in case I reinstalled grub
and rebooted. Everything went up.