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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 08-23-2010, 08:31 PM
 
Default DM manual failback doesn't work on RHEL5

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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Old 08-25-2010, 05:44 PM
Malahal Naineni
 
Default DM manual failback doesn't work on RHEL5

Yanqing_Liu@Dell.com [Yanqing_Liu@Dell.com] wrote:
> 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.

There are few cases where you need to re-build your initrd if you change
multipath.conf file. What does the loaded table say? Does it indicate
that the failback mechanism is 'manual'?

Thanks, Malahal.

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