[dm-devel] Question about Multibus+Failover
Josef Whiter
jwhiter at redhat.com
Tue Dec 6 21:10:50 UTC 2005
Christophe Varoqui wrote:
>On mar, 2005-12-06 at 15:37 -0500, Josef Whiter wrote:
>
>
>>Hello,
>>
>>I've had several requests about loadbalancing coupled with failover for
>>dm multipathing. I know with failover you get just failover, and
>>multibus you get just load balancing, but I was wondering if there was a
>>hybrid option for load balancing that would handle a failed path
>>gracefully. Thanks much,
>>
>>
>>
>Failed paths are handled quite gracefully in all grouping policies.
>
>That said, other stock grouping policies are at your disposal :
>group_by_serial or group_by_node_name or the special group_by_prio that
>let you do your own grouping policy with callouts (shell scripts or
>whatever).
>
>Please have a look at the documentation available.
>
>Regards,
>cvaroqui
>
>
>
Hmm, then perhaps I've been seeing errant behavior, b/c everytime
somebody uses multibus and they fail a path they get a bunch of IO
errors and the FS is remounted, but if they use failover and pull the
active connection, there are no errors and the failover is seamless. I
shall investigate further on what they are seeing. Thank you,
Josef
--
Josef Whiter, RHCE
Global Support Services
Red Hat, Inc.
919-754-3700 x44429
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