Dell Shared PowerEdge RAID Controller (PERC) 8 For Dell PowerEdge VRTX Systems User’s Guide

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Multipath configuration in SLES

  1. Modify the multipath.conf file at /etc/multipath.conf with the parameters as suggested in the appending I. If copying the file from Windows, please use dos2unix multipath.conf file once you have copied it over.
  2. To start multipath services and enable them to start at reboot: chkconfig multipathd on chkconfig boot.multipath on If the boot.multipath service does not start automatically on system boot, do the following to start them manually:  /etc/init.d/boot.multipath start   /etc/init.d/multipathd start
  3. Multipath configuration can be verified with the information in /etc/multipath.conf file by utilizing following commands. multipath -v2 –d multipath -v3 –d Once the above commands are verified to be successful, the multipath devices will be available at /dev/mapper/mpathX by default where X will be multipath eligible devices. You can use multipath-ll to verify the status of the multipath configuration. The output should be similar to the details shown below:

    linux-ha-2:~ #multipath –ll

    mpathc (3690b11c025a5ef001b289a2f60d160b6) dm-1 DELL ,Shared PERC8

    size=50G features='0' hwhandler='0' wp=rw

    |-+- policy='round-robin 0' prio=50 status=active

    | `- 1:2:1:0 sdc 8:32 active ready running

    `-+- policy='round-robin 0' prio=10 status=enabled

    `- 2:2:1:0 sde 8:64 active ready running

    mpathb (3690b11c025a5ef001b2895c11d374ab5) dm-0 DELL ,Shared PERC8

    size=10G features='0' hwhandler='0' wp=rw

    |-+- policy='round-robin 0' prio=50 status=active

    | `- 1:2:0:0 sdb 8:16 active ready running

    `-+- policy='round-robin 0' prio=10 status=enabled

    `- 2:2:0:0 sdd 8:48 active ready running

    In the above output, the status field shows us whether a path is active or enabled. The active path services the IO. Priority field is also used in conjunction with status field to identify the path to be used with highest priority. Also each path has a unique access identifier to the shared VD (For mpathc it is /dev/sdc and /dev/sde)

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