----- Original Message ----- > From: "Didier Kryn" <[email protected]>
> Le 05/01/2016 15:59, Rob Owens a écrit : >> I have customers who use a shared /usr among several zLinux >> systems, and the reason is cost savings. > For my information: They don't share rootfs? How do they manage > package upgrade? I just spoke to some coworkers and I have to revise my story a bit. The short answer is I don't know if these particular customers share the entire rootfs, just /usr, or some subset of /usr. There are mainframes that are used to host thousands of zLinux systems. For example, they may provide web servers to customers. In this scenario, they will attempt to share as much disk as possible between systems. The shared disk will typically be read-only on all systems except for one (perhaps a management system which is used to perform updates). Each system of course needs some read-write space, but the more shared disk it can utilize, the better (because that is cheaper and easier to manage). So are they sharing /usr and owning individual root filesystems? I'm not sure what these particular customers are doing. I can imagine scenarios where having that ability would be beneficial, but I'm not sure if these customers are actually doing it. I do know that they make heavy use of read-only disk sharing, and that taking two separate directories and dumping them into one will reduce granularity, which can make it more difficult to optimize disk sharing. -Rob _______________________________________________ Dng mailing list [email protected] https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
