On Tue, Mar 20, 2012 at 12:04:40AM -0600, Grzegorz Powiedziuk wrote: > But what about linux system disks? > I know that in general ECKD win over FCP.
I'd be not so sure about that. You need at least a bunch of aliases on the ECKD side to get into the same ballpark of speed. (With FCP AIUI Linux can just queue up multiple tagged I/O requests and the storage server will reply in an order it sees fit. Which is good for latency.) > But does FCP win over EDEV when we are talking about linux system? Are we just talking about speed or isolation/security? FCP clearly wins with the former, but loses with the latter. EDEVs don't do aliases AFAIK and you need FCP processing from CP, which isn't better than Linux's native support. I'd be curious what options are available to limit a single VM to specific LUNs when passing through the HBA. I know that I could limit the LPAR through NPIV, but single VMs? Kind regards, Philipp Kern ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
