I have a server with HP NC523 dual 10GbE network card and HP MSA1040 storage with dual 10GbE iSCSI-controller.
Both ports on NC523 are configured as a bond. The ports on MSA have different IP-addresses.
I want to configure this system to use 20Gb bandwidth (i.e bond on linux server and multipath on MSA). No switch should be used, just a direct connection.
If both ports of MSA are connected with fiber optic cables, only one port is reachable with ping (and presumable for that reason I can't initialize multipath). I cross-checked all the hardware components and all of it works in each possible combination as long only one line connects server with MSA.
Can somebody suggest me solution to this problem?
I have another similar server with a "normal" quad 1 GbE copper network card and an older HP P2000 storage with quad 1GbE iSCSI controller. Analogous configuration works here without any problem. The four interfaces on server are bound to a single bond and each port of iSCSI-storage can be pinged and also multipath works. Both machines are running with CentOS 7.