z/VM recording device nodes
Each recording service has a fixed minor number and a name that corresponds to the name of the service.
Table 1 shows the mapping of names and
minor numbers.
| z/VM® recording service | Standard device name | Minor number |
|---|---|---|
| *LOGREC | logrec | 0 |
| *ACCOUNT | account | 1 |
| *SYMPTOM | symptom | 2 |
The major device number for the z/VM recording device driver is assigned dynamically. Read the dev attribute of any one of the z/VM recording devices to find out the major number. The dev attribute is of the form <major>:<minor>.
Example: To read the dev attribute of the logrec
device:
# cat /sys/class/vmlogrdr/logrec/dev 254:0
While vmlogrdr registers its driver and device structures with the iucv bus, it also must register a class and a class device under /sys/class. The dev attribute is member of that class device. In the example, the assigned major number is 254 and the minor number is 0, as expected.