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.