Hello everybody! I'd like to mirror write accesses to a block-device to two devices, get all all *read* accesses from one of these, and if it fails, to fallback to the other device. The usage would be to use some kind of NAS box as persistent network block device, with some other machine with a lot of RAM as cache server; the cache server would get asked for data, and if it's not available, the request should go to the NAS directly. If I read the multipath documentation correctly (at http://christophe.varoqui.free.fr/multipath.html): For completion, here is an example of a pure failover target definition for the same LU : ... multipath should do part of what I want - use another device if the first one fails. But that doesn't account for pushing writes to both; and how is failing defined for NBD? I don't see some configurable timeout. Thank you for all ideas/suggestions! [[ but please CC me ]] Regards, Phil -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
