I'm running RHEL5 with QLogic HBA's and a Sun 6140 SAN. The host type
I'm using for my servers is 'Solaris (with DMP)'. This turns AVT mode
one. For some reason, the two controllers are returning the same
priority value to my priority call out program (mpath_prio_tpc).
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]
Where is should be:
[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=3][active]
\_ 1:0:0:2 sdd 8:48 [active][ready]
\_ round-robin 0 [prio=0][active]
\_ 1:0:1:2 sdg 8:96 [active][ready]
I've gotten this working at my other data center with the same
hardware/software configuration. At the moment, I'm pointing my finger
at the SAN hardware but I don't have much to back it up with.
here's my multipath.conf file:
blacklist
{
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st|sda)[0-9]*"
}
defaults
{
udev_dir /dev
polling_interval 10
selector "round-robin 0"
path_grouping_policy group_by_prio
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout "/sbin/mpath_prio_tpc /dev/%n"
path_checker readsector0
rr_min_io 100
rr_weight priorities
failback immediate
no_path_retry queue
user_friendly_name yes
}
devnode_blacklist
{
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st|sda)[0-9]*"
devnode "^hd[a-z][0-9]*"
devnode "^cciss!c[0-9]d[0-9]*"
}
multipaths
{
multipath
{
wwid 3600a0b800029cc400000120946e56616
alias mdi_deploys
}
multipath
{
wwid 3600a0b800029f8e80000064d46e565e7
alias mdi_logging
}
multipath
{
wwid 3600a0b800029cc4000001140468531fa
alias primary_logging
}
}
devices
{
device
{
vendor "SUN"
product "CSM200_R"
path_grouping_policy group_by_prio
path_checker readsector0
prio_callout "/sbin/mpath_prio_tpc /dev/%n"
getuid_callout "/sbin/scsi_id -g -u -s
/block/%n"
rr_weight uniform
rr_min_io 1000
features "1 queue_if_no_path"
}
}
cheers,
--james
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