multipath not load balancing
Issue
- multipath doesn't seem to be load balancing at all.
- A dd cmd to the mpath device monitored by iostat proves this out.
- The same dd cmd to each of the two paths verifies we're able to do I/Os on either path.
- The rr_min_io setting was adjusted down to '1' and multipath -r was run to test this as well.
Environment
- RHEL 5.8
- device-mpper-multipath 0.4.7-48.el5_8.1.x86_64
- HITACHI DF600F storage
- minimal (mostly built-in h/w table) multipath.conf settings
defaults {
bindings_file "/etc/multipath/bindings"
user_friendly_names yes
}
devices {
device {
vendor "HITACHI"
rr_min_io 1
}
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^(hd|xvd|vd)[a-z]*"
wwid "*"
}
blacklist_exceptions {
... whole bunch of wwid exceptions ...
}
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