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 ...
}
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.
Close
Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.