Fencing is provided as an alternative method for controlling access to disks that
are connected to multiple using systems.
The PCI SSAMulti-Initiator/RAID EL Adapter, the Micro Channel SSA
Multi-Initiator/RAID ELAdapter, and the Advanced SerialRAID Adapter can reserve to a
node number rather than to an adapter (see “Reserving Disk Drives”on page27). It is
highly recommended that you make use of this ability by setting the SSArouter
node_number attribute if multiple adapters are to be configured as described here.
Configuring SSA Disk Drive Devices
SSAdisk drives are represented as SSA logical disks (hdisk0, hdisk1.....hdiskn) and
SSAphysical disks (pdisk0, pdisk1.....pdiskn). The properties of each are described in
the SSASubsystem Overview.
Normally,the system boot process automatically configures all the disk drives that are
connected to the using system. Youdo not need to take any action to configure them.
Because SSAdevices might be added to the SSA network while the using system is
running and online, you might need to configure SSAdisks after the boot process has
completed. Under these conditions, use the cfgmgr command to configure the devices.
An exception is to configure a specific device with a specific name. Youcan do this with
the mkdev command.
268 User’s Guide and Maintenance Information
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