Issue

• We have assigned new SAN devices to the system, but it was observed that dm-multipath was not creating the symbolic link between new multipath device maps /dev/mapper/mpathX and corresponding /dev/dm-N devices:

  /dev/mapper:
  total 0
  drwxr-xr-x.  2 root root     420 Sep 23 07:37 .
  drwxr-xr-x. 18 root root    7120 Sep 23 07:37 ..
  lrwxrwxrwx.  1 root root       7 May  8 08:14 data1 -> ../dm-2      <-------+
  lrwxrwxrwx.  1 root root       8 May 20 07:56 data10 -> ../dm-12            |
  lrwxrwxrwx.  1 root root       7 May  8 08:14 data2 -> ../dm-6              |
  lrwxrwxrwx.  1 root root       7 May  8 08:14 data3 -> ../dm-3              | Existing multipath devices
  lrwxrwxrwx.  1 root root       7 May  8 08:14 data4 -> ../dm-7              | for which symlink to /dev/dm-N devices
  lrwxrwxrwx.  1 root root       7 May  8 08:14 data5 -> ../dm-4              | are created
  lrwxrwxrwx.  1 root root       8 May 20 07:56 data6 -> ../dm-10             |
  lrwxrwxrwx.  1 root root       7 May 20 07:56 data7 -> ../dm-8              |
  lrwxrwxrwx.  1 root root       8 May 20 07:56 data8 -> ../dm-11             |
  lrwxrwxrwx.  1 root root       7 May 20 07:56 data9 -> ../dm-9      <-------+
  brw-rw----.  1 root disk 253, 13 Sep 23 07:37 mpatht            <-------+
  brw-rw----.  1 root disk 253, 14 Sep 23 07:37 mpathu                    | a symlink to /dev/dm-N devices
  brw-rw----.  1 root disk 253, 15 Sep 23 07:37 mpathv                    | is not created
  brw-rw----.  1 root disk 253, 16 Sep 23 07:37 mpathw                    | for these multipath devices
  brw-rw----.  1 root disk 253, 17 Sep 23 07:37 mpathx            <-------+