linux mitipath disk adding - lesson learn

Today I use below command to add mutiple path disk in linux system:

1: fdisk /dev/mapper/mpathlj

2:partx -a /dev/mapper/mpathlj

3: pvcreate /dev/mapper/mpathljp1

4: vgextend vg_one /dev/mapper/mpathljp1

5: lvextend -L +150G /dev/mapper/vg_one_01-lv_ora

6: resize2fs /dev/mapper/vg_one_01-lv_ora

Some problem occurred:

1: when fdisk processing, below wanring:

--
Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 22: Invalid argument.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

--- You CAN see can use "partprobe (8) or kpartx to fix some prolems.

--- OK, next step:

---

2: when doing the second step:

partx -a /dev/mapper/mpathlj

below problem occurred:

root@A]# partx -a /dev/mapper/mpathlj
BLKPG: Invalid argument
error adding partition 1

---- using kpartx to fix this problem:

[root@A]# kpartx -a /dev/mapper/mpathlj

----- neststep:

3: pvcreate /dev/mapper/mpathljp1

 find the disk: /dev/mapper/mpathljp1 is not found.

when I check the path: 3: pvcreate /dev/mapper/mpathlj1 is created.

so I adjust command as :

3: pvcreate /dev/mapper/mpathlj1

---then execute below step is sucessfully:

4: vgextend vg_one /dev/mapper/mpathlj1

-- then extend the FS is successfully.

lesson learn:

1: partx -a command can only execute one time.
2: kpartx command can be used instead of partx.
3: check the disk arrangment after storage activites completed is important.
4: if the disk had problem, raise the concern immediately, donot hold the issue here.