US 11,704,206 B2
Generation of host requests to a storage controller for read diagnostic parameters for a data mirroring configuration
Dale F. Riedy, Poughkeepsie, NY (US); Scott B. Compton, Hyde Park, NY (US); Susan K. Candelaria, Tucson, AZ (US); Roger G. Hathorn, Tucson, AZ (US); and Harry M. Yudenfriend, Poughkeepsie, NY (US)
Assigned to INTERATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed by INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed on Sep. 15, 2021, as Appl. No. 17/476,171.
Application 17/476,171 is a continuation of application No. 16/213,802, filed on Dec. 7, 2018, granted, now 11,157,375.
Prior Publication US 2022/0004471 A1, Jan. 6, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 11/20 (2006.01); G06F 3/06 (2006.01)
CPC G06F 11/2056 (2013.01) [G06F 3/061 (2013.01); G06F 3/067 (2013.01); G06F 3/0635 (2013.01); G06F 3/0646 (2013.01); G06F 11/201 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method, comprising:
configuring a host to communicate with a first storage controller over a first storage area network that is not isolated from the host, wherein a second storage area network is isolated from the host, wherein a first type of request comprising Extended Link Services (ELS) commands over a Fibre Channel (FC) protocol allows the host to acquire read diagnostic parameters of the first storage area network but not of the second storage area network, and wherein diagnostic data for a mirroring of data controlled via the first storage controller to a second storage controller over the second storage area network are hidden by the first storage controller from the host and are prevented from being retrieved by the ELS commands over the FC protocol; and
transmitting a second type of request from the host to the first storage controller to provide read diagnostic parameters of the second storage area network that is used for mirroring of data controlled by the first storage controller to the second storage controller, wherein the second type of request comprises a set of Perform Subsystem Function (PSF), Device Server Option (DSO) and a read subsystem data commands that allow the host to receive the read diagnostic parameters of the second storage area network.