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Linux® on the Mainframe
book

Linux® on the Mainframe

by John Eilert, Maria Eisenhaendler, Dorothea Matthaeus, Ingolf Salm
June 2003
Intermediate to advanced content levelIntermediate to advanced
464 pages
10h 33m
English
Pearson
Content preview from Linux® on the Mainframe

26.1. Tuning Linux guests under VM

26.1.1. DASD subsystem

Linux disk support for the traditional zSeries disks is provided by the DASD driver code, dasd.c. It provides support for Count-Key-Data (CKD) and Fixed Block Address (FBA) disk devices, as well as VM minidisks. The DASD driver uses channel I/O to perform read and write operations.

There are currently three ways to format disks used by Linux:

  1. dasdfmt

    The DASD driver in Linux for zSeries and S/390 comes with the dasdfmt utility to format the disks. It formats all tracks on the disk with a fixed block size. There is no support for this particular format in existing S/390 software.

  2. CMS FORMAT

    The FORMAT program in CMS also formats the disk with fixed block size, but adds a special eye catcher ...

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ISBN: 0131014153Purchase book