Am 31.01.2017 um 22:51 schrieb Gianluca Cecchi:
Hello, suppose I want to use a special configuration for my IBM/1814 storage array luns, then I put something like this in multipath.conf
devices { device { vendor "IBM" product "^1814" product_blacklist "Universal Xport" path_grouping_policy "group_by_prio" path_checker "rdac" features "0" hardware_handler "1 rdac" prio "rdac" failback immediate rr_weight "uniform" no_path_retry "12" } }
In CentOS 6.x when you restart multipathd or restart server, using
multipathd -k multipathd> show config multipathd> exit
That prints out the build-in defaults. See
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/pdf...
chapter 4.
in output you see your particular configuration instead than the default one for this particular device. In CentOS 7.3 instead I see it two times, the first one with the default built-in values (eg "no_path_retry fail") and at the end the customized one. So it is not clear what is the actual configuration that device mapper multipath is using... The last wins? Is this expected behaviour? In that case what command can I use to crosscheck it (apart from real testing that is anyway necessary to verify too)? Eg in CentOS 7.3 I'm using device-mapper-multipath-0.4.9-99.el7_3.1.x86_64 while on CentOS 6.8 I'm using device-mapper-multipath-0.4.9-93.el6.x86_64
Thanks in advance, Gianluca
To configure a custom setup and enable it please see chapter 3 of the RHEL documentation about device-mapper multipath.
Regards
Alexander