On 02/24/2016 01:00 PM, Andy Grover wrote: > On 02/01/2016 11:07 PM, Avishay Traeger wrote: >> Hi all, >> I have a system where various configurations are possible - iSCSI/FC, >> single paths and multiple. For multiple I of course use device-mapper. >> I was wondering if it was possible to: >> 1. use it for cases where I have a single path. >> 2. create a monitoring process that can take some action (e.g., send a >> notification via message queue) in the case of some failure that would >> normally cause failover. > > Does dm-multipath support a single path? I don't know... > Pshaw. Of course it does. (Might be that RH has some magic disallowing that, but certainly there's nothing in the source which forbids it. In fact I recommend it when using iSCSI) So I recommend to always use dm-multipath and listen to uevents. > but for your #2, dm-multipath publishes a uevent when a path fails, > maybe the process could look for that? Using libudev? > Alternatively (if you don't want the failover to happen from multipath itself) you can implement your own device_handler sending out an uevent and waiting for some magic sysfs attribute to be written to before completing. Should be rather trivial. Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
