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Thread: multipathing in ubuntu 12.04

  1. #1
    Join Date
    May 2014
    Beans
    3

    multipathing in ubuntu 12.04

    hi
    I tried to configure multipathing in ubuntu 12.04.
    When I add new luns on the server, I show it with the multipath OK, but if I boot the server, I lost the multipath ( with dmsetup ls --tree, I see only one path for the logical volume ). I haven't this problem in UBUNTu 10.04.
    are there any change in the configuration of multipathing between ubuntu 10.04 and ubuntu 12.04.
    Thank you in advance for your help.

  2. #2
    Join Date
    Jun 2011
    Beans
    417
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: multipathing in ubuntu 12.04

    Hi

    Have you already checked this: https://help.ubuntu.com/12.04/server...tipathing.html

    - HTH

  3. #3
    Join Date
    May 2014
    Beans
    3

    Re: multipathing in ubuntu 12.04

    I have seen this link.
    I think that my problem is not in the multipath config but in the link between multipathing and the lvm layer.

    I explain you my problem.

    I create a lun on the server and I put il on a vg
    I create a lv and a file system on it

    At this moment, when I look on the server, I see a mounted file system which used multipath.

    #dmsetup ls Ėtree
    vg00-swap_1 (254:12)
    ‚‚ (8:101)
    vg01-lv_mysql (254:3)
    ‚‚mpath7 (254:0)
    ‚‚ (8:0)
    ‚‚ (8:48)


    If if try to access to the file system, I see with iostat command that the two path work

    I reboot the server.

    The file system goes up and I find my data on it.

    When I'm looking on multipathing,
    I see

    ‚‚mpath7 (254:0)
    ‚‚ (8:0)
    ‚‚ (8:48)
    vg01-lv_mysql (254:3)
    ‚‚ (8:0)

    When I look on the iostat result, I see that all the I/O go on one path. If I put this path down, I loose the access on the lv.

    If I export/import the volume group, the multipathing returns ok.

  4. #4
    Join Date
    May 2014
    Beans
    3

    Thumbs up Re: multipathing in ubuntu 12.04

    I have found the solution to my problem. I had to modify le line "filter" in the lvm.conf file.
    I have put this :
    filter = [ "r|/dev/cdrom|", "a|/dev/sda|", "r|/dev/sd.*|", "a|/dev/mapper/mpath.*|" ]

    and now the multipath stays ok even if I boot the server.

    Thanks for the help

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