nsddevices user exit
Identifies local physical devices that are used as GPFS™ Network Shared Disks (NSDs).
Description
The /var/mmfs/etc/nsddevices user exit, when properly installed, is invoked synchronously by the GPFS daemon during its disk discovery processing. The purpose of this procedure is to discover and verify the physical devices on each node that correspond to the disks previously defined to GPFS with the mmcrnsd command. The nsddevices user exit can be used to either replace or to supplement the disk discovery procedure of the GPFS daemon.
Read the sample file /usr/lpp/mmfs/samples/nsddevices.sample for a detailed description on how to code and install this user exit.
Parameters
None.
Exit status
The nsddevices user exit should return either zero or one.
When the nsddevices user exit returns a value of zero, the GPFS disk discovery procedure is bypassed.
When the nsddevices user exit returns a value of one, the GPFS disk discovery procedure is performed and the results are concatenated with the results from the nsddevices user exit.