> could you please explain your pain points with GDPS/XRC in your Linux/VM > setup? While z/VM itself doesn't seem to timestamp its I/O Linux does and > z/VM would carry all Linux timestamps out to the storage control unit as > it > re-issues the Linux I/O requests. Do you have problems with these > limitations? Other?
While I'm not Bob, an observation: The problem here is a common one when having conversations with IBM about virtualization on Z at any real scale. The solution that is offered supports only part of the problem. You've addressed the Linux and z/OS layers, but the z/VM layer -- which is just as important, as it controls the resource allocation to the Linux layer and is directly critical to the cost and ROI cases for having Linux on Z in the first place, is completely left out of the management picture of the solution. If you're trying for a completely managed solution (which is what GDPS is supposed to provide), then omitting a major portion of the solution from the management integration pretty much torpedoes the argument for creating the solution in the first place. If I have to create exceptions to the IBM management infrastructure to *deal with a strategic product made by IBM*, then there is a fundamental design problem here. Having VM be unmanaged in that environment blows the whole premise of completely controllable failover. The same argument applies to EWLM, IRD, and many other things -- GDPS and the tools required to implement really highly-available managed solutions need to be actively cognizant of the presence of VM in scenarios like GDPS, and not treat it as a poor stepchild who can be ignored as a helpless invalid. Treat it as a client, but treat it you must, because it's a critical piece of the plumbing. LPAR isn't an acceptable alternative. ---------------------------------------------------------------------- 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
