If the Cluster Edition does not have permission to access a device because a process on another machine is using the device, and the device can be used only by a single machine at a time, the operating system issues:
The IBM AIX SDC dataserver may fail to run with one of the following errors: Quorum library error 1: Failed to open quorum device '/dev/disk_name'. OS error 16, 'Device busy'
Or:
dopen: open '/dev/disk_name', Device busy
The device must allow multiple servers simultaneous access. The database devices must have shared reservations where the reservation key is the instance ID defined in the cluster configuration file (for example, where ID = 1):
Change the device access restrictions for the quorum device on each machine in the cluster:
chdev -l device_name -a reserve_policy=no_reserve
For example, if a disk device is named /dev/hdisk1:
chdev -l /dev/hdisk1 -a reserve_policy=no_reserve
Run this command for each database device on each instance in the cluster to change the device access restrictions for a database device:
chdev -l device_name -a PR_key_value=instance_ID -a reserve_policy=PR_shared
For example, to change the device access restrictions for /dev/rhdisk2 on instance 1:
chdev -l hdisk2 -a PR_key_value=1 -a reserve_policy=PR_shared
