Hi all,
In our testing with DM RDAC stack with RHEL 5 (including 5.5 and 5.4), we found that manual failback doesn't work as expected.
What we did is to connect the host to Dell PowerVault 3200/i array. After everything is configured, we changed "failback" value for our device from "immediate" to "manual". Then the host is rebooted for the new value to take effect. However, automatic
failback still happens once failed path is restored. It seems failback "manual" doesn't work.
We've also verified deferred failback works as expected. So "manual" failback seems to be the only issue.
Our device section in multipath.conf is as follows:
...
device {
vendor "DELL"
product "MD32xxi"
path_grouping_policy group_by_prio
prio rdac
polling_interval 5
path_checker rdac
path-selector "round-robin 0"
hardware_handler "1 rdac"
failback manual
features "2 pg_init_retries 50"
no_path_retry 30
rr_min_io 100
prio_callout "/sbin/mpath_prio_rdac /dev/%n"
}
…
Any sugegstion or insight on this issue?
Thanks,
Yanqing
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