DASDINFO(8)

NAME
dasdinfo - tool to read unique id from s390 DASD device

SYNOPSIS
dasdinfo [-a] [-l] [-u] [-x] [-e] {-i <busid> | -b <blockdev> | -d <devnode> }

dasdinfo [-h] [-v]

DESCRIPTION
dasdinfo displays specific information about a specified DASD device. It is normally called from a udev rule, to provide udev with a unique id string and additional information (type, serial) for an S390 DASD drive. Udev can use this information to create symlinks in /dev/disk/by-id and /dev/disk/by-label to the real device node.

OPTIONS

-a|--all
    Same as -u -x -l

-x|--extended-uid
    Print DASD uid This option prints the full uid of the DASD. When z/VM provides two virtual devices that are actually located on the same real device, the first four tokens of the uid will be identical for both devices. z/VM may provide an additional token that can be used to distinguish between different minidisks. You need both support in the Linux kernel and z/VM to receive such an additional token. For z/VM: VM support for the hypervisor injected Special Node Element Qualifier (SNEQ) (or hypervisor injected self-description data) is available by applying the PTFs for VM APAR VM64273 on z/VM 5.2.0 and higher.

-u|--uid
    Print DASD uid without z/VM minidisk token z/VM may provide an additional token that can be used to distinguish between different minidisks (see --extended-uid option). To remain compatibile with systems that were installed on older Linux or z/VM levels, the -u option will print the uid excluding any z/VM-provided minidisk token. For example, if the extended uid is IBM.75000000092461.e900.10.00000000000037400000000000000000 then the uid is IBM.75000000092461.e900.10. If the extended uid contains no minidisk token, e.g. in an LPAR environment, then both uids are the same.

-l|--label
    Print DASD volume label (volser).

-i|--busid <busid>
    Use the bus ID as input parameter, e.g. 0.0.e910.

-b|--block <blockdev>
    Use the block device name as input parameter, e.g. dasdb.

-d|--devnode <devnode>
    Use a device node as input parameter, e.g. /dev/dasdb.

-e|--export
    Print all values (ID_BUS, ID_TYPE, ID_SERIAL).

-h|--help
    Print usage text.

-v|--version
    Print version number.

EXAMPLES
dasdinfo -u -i 0.0.e910 dasdinfo -u -b dasdb dasdinfo -u -d /dev/dasdb All three examples should return the same unique ID for the same DASD device, e.g. IBM.75000000092461.e900.10. In case this uid is not available, dasdinfo will return the volume label instead, e.g. 0XE910.

SEE ALSO
udev(7)

AUTHORS
Volker Sameske <sameske@de.ibm.com>