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Re: [dm-devel] [multipath] meaning of "no_path_retry nn"



Diedrich Ehlerding wrote:
I would appreciate an explanation of "no_path_retry nn" parameter in multipath.conf. Probably I misunderstood it as a number of seconds. I am setting up a software mirror (mdadm) on top of an EMC Clariion configuration for desaster protection. The Clariions are recognized by multipath properly; it seems to be set up with "no_path_retry 60" (according to multipath -t). I had no further settings in multipath.conf; this seems to be hardcoded into multipath. However, If I disconnect one Clariion, th mirror doesnt break - multipath detects that all paths are failed and tells me that it will now wait for 60 retries. These 60 retries seem to last very long; atfter 5 minutes, it didnt complete. Evertyhing works fine if I set up a multipath.conf containing the Clariion settings from multipath -t and modify them to "no_path_retry fail" and "features 0 fail_if_no_path". But even if I just reduce the default settings to no_path_retry 2 the mirror doesnt break - the IOs seem to hang indefinitely (well, I lost patience after ~5 minutes).

Probably I misunderstood "no_path_retry 60" - does that mean seconds, or minutes, or what else? Is anything except "fail" a useful setting in mirrored configurations?
system is a Suse  with multipath-tools-0.4.7-34.43

Please note that there is a bug in the multipath-tools on suse which
prevents the no_path_retry option from working correctly.

Please install the latest maintenance update.

Cheers,

Hannes
--
Dr. Hannes Reinecke		      zSeries & Storage
hare suse de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)


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