Hi,
> Can anyone briefly explain what the mpath_prio_tpc utility does and
> where these priority values come from?
>
> The output of multipath -v2 -ll is:
>
> [root@vlxq02md cluster]# multipath -v2 -ll
> mdi_logging (3600a0b800029f8e80000064d46e565e7) dm-9 SUN,CSM200_R
> [size=100G][features=1 queue_if_no_path][hwhandler=0]
> \_ round-robin 0 [prio=0][active]
> \_ 1:0:0:2 sdd 8:48 [active][ready]
> \_ 1:0:1:2 sdg 8:96 [active][ready]
you are sure your two pathes are using different controllers? A SAN setup
problem which makes the HBA use only 1 of the two controllers seems to be a
very good reason for this multipath output.
Do you use a single-port HBA?
With my dual-port HBA I get:
Raid5_for_IMAP-Volume (3600a0b80002906e20000089345bf1a2b) dm-1 SUN,CSM200_R
[size=1.4T][features=0][hwhandler=0]
\_ round-robin 0 [prio=12][active]
\_ 7:0:1:1 sdac 65:192 [active][ready]
\_ 6:0:3:1 sds 65:32 [active][ready]
\_ round-robin 0 [prio=2][enabled]
\_ 7:0:3:1 sdam 66:96 [active][ready]
\_ 6:0:1:1 sdi 8:128 [active][ready]
with multipath.conf:
devices {
device {
vendor SUN
product CSM200_R
path_grouping_policy group_by_prio
path_checker tur
prio_callout "mpath_prio_tpc /dev/%n"
features "1 queue_if_no_path"
}
}
BTW: A polling interval of 10 seconds is too slow for 6140 firmware
updates,
I had to use 5 seconds because the controllers are rebooting quite fast...
regards,
Eckebrecht
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