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 allows 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 allows 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>