On Wednesday, 04/01/2009 at 05:33 EDT, "Gary M. Dennis" <gary.den...@mantissa.com> wrote: > Is there a VM I/O management system available which will: > > 1. Support space allocation requests for guests on a sparse basis? The file > server needs to make the guest believe it actually has the entire allocation > while only tying up space in the pool the guest actually used.
This is a function of the disk storage controller. IBM Flashcopy SE (Space Efficient) enables overcommittment (and, hence, UNDERprovisioning!) of storage. > 2. Support Async I/O requests from multiple guests? That is SSCH or DIAGNOSE 0x250. > 3. Dynamically scale and from sub- TB to n EB. Storage controllers can be provisioned with a wide range of backing store. If a guest needs more disk space, give it another minidisk. It is up to the guest to aggregate multiple minidisks into a single data repository. (A la LVM in Linux.) z/VM does not have multiple-extent minidisks. Alan Altmark z/VM Development IBM Endicott
