Cloning FCP-attached SCSI Disks on SLES9 Linux for zSeries Systems

An IBM Redpaper publication

Note: This is publication is now archived. For reference only.

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Published on 07 December 2004

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IBM Form #: REDP-3871-00


Authors: Robert Brenneman

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    Abstract

    This Redpaper describes a procedure to clone a root filesystem residing on an FCP-attached

    SCSI disk. Cloning SCSI disks that act as a Linux root filesystem requires special processing

    (compared to cloning ECKD DASD). An initial ramdisk containing the zfcp device driver is

    required to IPL from SCSI. The ramdisk also contains the FCP device mapping needed to

    access the root filesystem on the SCSI disk. When the filesystem is copied, a new initial

    ramdisk must be created on the cloned disk. This ramdisk must map the cloned SCSI disk as

    the root filesystem (and not the filesystem on the original master SCSI disk).

    We illustrate the steps using a SUSE SLES9 Linux distribution running as a guest under

    z/VM. The procedure also applies to Linux running in an LPAR on zSeries.

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