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DM-Multipath が、マルチパスデバイスのマッピングと /dev/dm-N デバイスとの間にシンボリックリンクを作成しない

Solution Unverified - Updated -

Issue

  • システムに新しい SAN デバイスを割り当てましたが、 dm-multipath が、新しいマルチパスデバイスのマッピング /dev/mapper/mpathX とそれに対応する /dev/dm-N デバイスとの間にシンボリックリンクを作成しませんでした。

    /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          <-------+
    

Environment

  • Red Hat Enterprise Linux 6
  • デバイスマッパーのマルチパス

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