[ovirt-users] oVirt 4.0 and multipath.conf for HPE 3PAR. What do you advise?

[Yaniv Dary]

Changing multpath  conf is not supported, since this file is managed by
VDSM.
It should work well for the oVirt use case. Configuration should be changed
via the manager if needed and not via the conf.

Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109

Tel : +972 (9) 7692306
        8272306
Email: ydary at redhat.com
IRC : ydary


On Sat, Aug 13, 2016 at 4:03 PM, <aleksey.maksimov at it-kb.ru> wrote:

> Hello, oVirt guru's !
>
> I installed oVirt 4.0 on several servers HP ProLiant DL360 G5 with
> QLogic/Emulex 4G dual-port HBAs.
> These servers have multipath connection to the storage system HP 3PAR 7200.
>
> Before installing oVirt to servers I set up the configuration file
> /etc/multipath.conf according to the vendor recommendations from document
> "HPE 3PAR Red Hat Enterprise Linux and Oracle Linux Implementation Guide
> (emr_na-c04448818-9.pdf)"
> https://blog.it-kb.ru/2016/06/12/configuring-device-mapper-
> multipathing-dm-multipat-mpio-in-centos-linux-7-2-with-
> emulex-and-qlogic-fc-hba-connecting-over-san-storage-
> hp-3par-7200-3par-os-3-2-2/
>
> Before installing oVirt my multipath.conf was the:
>
> ---> start of /etc/multipath.conf <-----
>
> defaults {
>         polling_interval 10
>         user_friendly_names no
>         find_multipaths yes
> }
> blacklist {
>         devnode "^cciss\/c[0-9]d[0-9]*"
> }
> multipaths {
>        multipath {
>                wwid   360002ac000000000000000160000cec9
>                alias  3par-vv2
>        }
>        multipath {
>                wwid   360002ac000000000000000170000cec9
>                alias  3par-vv1
>       }
> }
> devices {
>         device {
>                 vendor "3PARdata"
>                 product "VV"
>                 path_grouping_policy group_by_prio
>                 path_selector "round-robin 0"
>                 path_checker tur
>                 features "0"
>                 hardware_handler "1 alua"
>                 prio alua
>                 failback immediate
>                 rr_weight uniform
>                 no_path_retry 18
>                 rr_min_io_rq 1
>                 detect_prio yes
>         }
> }
> ---> end of /etc/multipath.conf <-----
>
> But after installing oVirt file multipath.conf has changed to:
>
> ---> start of /etc/multipath.conf <-----
> defaults {
>     polling_interval            5
>     no_path_retry               fail
>     user_friendly_names         no
>     flush_on_last_del           yes
>     fast_io_fail_tmo            5
>     dev_loss_tmo                30
>     max_fds                     4096
> }
> devices {
>     device {
>         all_devs                yes
>         no_path_retry           fail
>     }
> }
> ---> end of /etc/multipath.conf <-----
>
> Now I'm not sure that this configuration is optimal. What do you advise?
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