Dell PowerVault ME5 Series Administrator's Guide

Enabling MPIO on Windows

1. Start Server Manager if it is not already running.
2. In the Manage menu, select Add Roles and Features.
3. In the Add Roles and Features Wizard, select Role-based or Feature Based Installation.
4. Click Next.
5. Select the server from the pool and then click Next.
6. Click Next again to go to the feature selection window.
7. Select the Multipath IO check box and then click Next.
8. Click Install.
9. When the installation is complete, click Close.
10. In the Server Manager Tools menu, select MPIO.
11. Select the Discover Multi-Paths tab.
12. Select check boxes for the devices you want to support, and then click Add.
13. When prompted, reboot the system.

    When the reboot is complete, MPIO is ready to use.

Enabling MPIO on Linux

This procedure is a general procedure, and does not address specific nuances of different Linux operating systems.

1. Run the following command to ensure that the multipath daemon is installed and set to start at run-time:

   systemctl status multipathd

2. Ensure the correct entries exist in the /etc/multipath.conf file on each OSS/MDS host. Create a separate device entry for the ME5 Series storage system. The following table specifies four attributes that should be set. Run the following command to obtain the exact vendor and product ID values:

   multipath -v3

   Attribute	Value
   prio	alua
   failback	immediate
   vendor	vendor-name
   product	product-ID

   Retain the default settings for the remaining attributes. For example:

   devices 
   device {
        vendor "DellEMC
   						"
        product "ME5"
        path_checker "tur"
        hardware_handler "1 alua"
        prio "alua"
        failback immediate
        rr_weight "uniform"
        path_selector "service-time 0"
   }

3. Run the following command to reload the multipath.conf file:

   systemctl restart multipathd

4. Run the following command to determine if the multipath daemon used ALUA to obtain the optimal/non-optimal paths:

   multipath -v3 | grep alua

Oct 01 14:28:43 | sdb: prio = alua (controller setting) Oct 01 14:28:43 | sdb: alua prio = 130