On 11/18/2015 02:55 PM, Richard Sharpe wrote:
Why does dm-multipath not switch to using the alternate paths?
I seem to recall one case where the iSCSI-related timeouts were not
set to lower values, for multipathing. So, failover took more time
than expected (ending up in the default value of 120 seconds iirc).
It was documented in the open-iscsi readme, section 8 advanced config
(includes topics for multipath configurations).
Additional references:
[1]
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/iscsi-replacements_timeout.html
[2]
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/iscsi-modifying-link-loss-behavior-dmmultipath.html
Hope this helps,
--
Mauricio Faria de Oliveira
IBM Linux Technology Center
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