As usually LPARs have a lot of devices connected to them you might want to start using cio_ignore if you are not already using it. Not using cio_ignore can really slow down linux startup when the LPAR has a lot of devices connected to it. On Jul 1, 2015 5:32 PM, "Alan Altmark" <[email protected]> wrote:
> On Wednesday, 07/01/2015 at 07:56 EDT, "Morris, Kevin J. (RET-DAY)" > <[email protected]> wrote: > > I know that we will lose the capability to overcommit/share memory > between > > zLinux systems, but the application running in this environment is very > > response-time critical/sensitive so we actually dedicated memory > resources to > > our production zLinux systems anyways. Additionally, after retiring the > ~12 > > servers, we now have a memory excess on all of our zVM LPARs. > > VSWITCH is nice with its automatic failover, etc; however, we have > tested the > > linux "bonding driver" and feel it is an adequate replacement. We are > not a > > zVM SSI user. > > The VSWITCH also provides the security controls to keep a guest from VLAN > hopping. (Assume Linux has been hacked.) As long as you have > compensating controls, removing the VSWITCH shouldn't pose any obstacle. > > > Given our static environment, can anyone provide any glaringly obvious > > caveats/downfalls to migrating from zVM to standalone zLinux LPARs that > we > > might be missing? > > As long as you remove all z/VM dependencies from the guests (mindisks, > VDISKS, DIAG250 driver, EDEVs, DR, etc.) before you migrate them to their > own LPARs, then you should be fine. For example, minidisks allowed the > virtual machines to share an I/O configuration. Your IOCDS will need to > be changed to create limited I/O configurations for each LPAR. > > Speaking of IOCDS, how do you plan to manage it? Standalone IOCP? Or is > z/OS on these boxes, too? > > Alan Altmark > > Senior Managing z/VM and Linux Consultant > Lab Services System z Delivery Practice > IBM Systems & Technology Group > ibm.com/systems/services/labservices > office: 607.429.3323 > mobile; 607.321.7556 > [email protected] > IBM Endicott > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to [email protected] 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/ > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] 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/
