z/VM: CP Planning and Administration - z/VM - IBM

CKD Device Geometry . . . . . . . . . . . . . . . . . . . . 603FBA Device Geometry . . . . . . . . . . . . . . . . . . . . . 604Storage Calculations . . . . . . . . . . . . . . . . . . . . . 604CP Module . . . . . . . . . . . . . . . . . . . . . . . . . . 605Warm Start Data . . . . . . . . . . . . . . . . . . . . . . . . 606Example . . . . . . . . . . . . . . . . . . . . . . . . . . 607Checkpoint Data . . . . . . . . . . . . . . . . . . . . . . . . 607Directory Space . . . . . . . . . . . . . . . . . . . . . . . . 608Example . . . . . . . . . . . . . . . . . . . . . . . . . . 609Directory Size Constraints . . . . . . . . . . . . . . . . . . . 610Paging Space . . . . . . . . . . . . . . . . . . . . . . . . . 610Example . . . . . . . . . . . . . . . . . . . . . . . . . . 611Spooling Space . . . . . . . . . . . . . . . . . . . . . . . . 613Allocating Space for CP Abend Dumps . . . . . . . . . . . . . . 614Named Saved System . . . . . . . . . . . . . . . . . . . . . 615Spool Space Example . . . . . . . . . . . . . . . . . . . . . 615Switching Operating Modes for 3390 Devices . . . . . . . . . . . . . 615Mode Switch Procedure . . . . . . . . . . . . . . . . . . . . 616Migration Considerations for the 3390 Model 9 . . . . . . . . . . . . . 617Chapter 21. DASD Sharing . . . . . . . . . . . . . . . . . . . 619Sharing DASD among Multiple Virtual Machines by Using VirtualReserve/Release . . . . . . . . . . . . . . . . . . . . . . . 619When to Use Virtual Reserve/Release . . . . . . . . . . . . . . . 621Sharing DASD without Using Virtual Reserve/Release . . . . . . . . . . 622Sharing DASD Using the CMS Shared File System . . . . . . . . . . . 622Sharing DASD between One Virtual Machine and Other Systems Using RealReserve/Release . . . . . . . . . . . . . . . . . . . . . . . 622When to Use Real Reserve/Release . . . . . . . . . . . . . . . 624Sharing DASD among Multiple Virtual Machines and Other Systems UsingConcurrent Virtual and Real Reserve/Release . . . . . . . . . . . . 624When to Use Concurrent Virtual and Real Reserve/Release . . . . . . . 626Restrictions for Using Reserve/Release . . . . . . . . . . . . . . . 626Reserve/Release Summary . . . . . . . . . . . . . . . . . . . . 626Sharing DASD using the Multi-Path Lock Facility . . . . . . . . . . . . 627Cached DASD . . . . . . . . . . . . . . . . . . . . . . . . 628Cache Control . . . . . . . . . . . . . . . . . . . . . . . . 628Defining a Minidisk on a Cached DASD . . . . . . . . . . . . . . 629Defining a Cached DASD as a Dedicated Device . . . . . . . . . . . 630Using ESS Parallel Access Volumes . . . . . . . . . . . . . . . . 631Using PAV for Workload Balancing . . . . . . . . . . . . . . . . 631Using PAV for DASD Sharing . . . . . . . . . . . . . . . . . . 632z/VM Restrictions on Using PAV . . . . . . . . . . . . . . . . . 633Chapter 22. Defining and Managing SCSI FCP Disks . . . . . . . . . 635Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 635Defining SCSI Devices . . . . . . . . . . . . . . . . . . . . . 637Emulated FBA Disks on SCSI Disks . . . . . . . . . . . . . . . 637Real SCSI Disks . . . . . . . . . . . . . . . . . . . . . . . 638Additional Considerations . . . . . . . . . . . . . . . . . . . . 639Appendix A. Sample Utility Programs . . . . . . . . . . . . . . . 641DRAWLOGO . . . . . . . . . . . . . . . . . . . . . . . . . 642Appendix B. Defining Your System (HCPSYS Macroinstructions) . . . . 643Coding HCPSYS ASSEMBLE . . . . . . . . . . . . . . . . . . . 644Contentsxi