[dm-devel] Multipath and LVM (lvdisplay takes 30Secs)
Moger, Babu
Babu.Moger at netapp.com
Wed May 16 16:47:33 UTC 2012
> -----Original Message-----
> From: dm-devel-bounces at redhat.com [mailto:dm-devel-
> bounces at redhat.com] On Behalf Of ml ml
> Sent: Wednesday, May 16, 2012 3:42 AM
> To: device-mapper development
> Subject: Re: [dm-devel] Multipath and LVM (lvdisplay takes 30Secs)
>
> Hi,
>
> >> multipath -l -v 2
> >> SAN (3600a0b80001f7557000032864ce4aff3) dm-0 IBM,1722-600
> >> size=250G features='1 queue_if_no_path' hwhandler='1 rdac' wp=rw
> >> |-+- policy='round-robin 0' prio=-1 status=active
> >> | `- 2:0:1:0 sdb 8:16 active undef running
> >> |-+- policy='round-robin 0' prio=-1 status=enabled
> >> | `- 3:0:1:0 sdd 8:48 active undef running
> >> `-+- policy='round-robin 0' prio=-1 status=enabled
> >> `- 3:0:0:0 sdc 8:32 active undef running
> >
> > Prio is showing -1. May be your path grouping policy and prio handler is not
> set right.
> > I would set it correctly and then test it again. Here is how I would set it in
> multipath.conf.
> > path_grouping_policy group_by_prio
> > prio rdac
> >
>
> Right now i am using "path_grouping_policy failover". See below for
> the full config file.
> Since i want failover/redundancy. In this case i really want
> "path_grouping_policy group_by_prio"?
Yes, With group_by_prio you will still have failover/redundancy.
>
> Here is the full config file:
>
>
> blacklist {
> devnode "sda"
> devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
> devnode "^hd[a-z][[0-9]*]"
>
> }
>
> defaults {
> user_friendly_names yes
> udev_dir /dev
> polling_interval 10
> verbosity 0
> path_grouping_policy failover
> #path_grouping_policy group_by_prio
> #prio rdac
>
> }
>
> multipaths {
> multipath {
> wwid 3600a0b80001f7557000032864ce4aff3
> alias SAN
> path_grouping_policy failover
> path_selector "round-robin 0"
> failback manual
> rr_weight priorities
> no_path_retry 5
> rr_min_io 100
> }
> }
>
> devices {
> device {
> vendor "IBM"
> product "1722-600"
> path_grouping_policy failover
I will recommend to add following lines here.
path_grouping_policy group_by_prio
prio rdac
> }
> }
>
>
>
> Thanks,
> Mario
>
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