Preparing to Set Up I/O Fencing

Enable I/O fencing.

The user or process must have permissions to manage the raw devices, using PV_ROOT, PV_SU_, or PV_KER_RAS privileges.

To enable I/O fencing on IBM AIX ensure that the users who start Adaptive Server have permission to access the SCSI fixed disks (/dev/rhdisk#), since Adaptive Server can use the databases or the quorum.
Ensure that all nodes are running AIX.
All disks are PR-capable (DS3000, DS4000, or newer), hdisks, and permit read/write access, using the following “chmod” commands on both the hdisk and the corresponding character access device rhdisk:
```
chmod 666 rhdisk#
```
```
chmod 666 hdisk#
```

Setting Up Raw Disks For Multi-Node Access and I/O Fencing
You can set up raw disks for multi-node access and I/O fencing.
I/O Fencing via SCSI-3 PGR
AIX supports I/O fencing with SCSI-3 Persistent Group Reservation (PGR) enabled.

Parent topic: I/O Fencing