Sun Microsystems 220R Configuration Rules, devices/pci@1f,4000/scsi@3/sd@0,0, Disk Slot Number

The hot-plug procedure involves software commands for preparing the system prior to removing a disk drive and for reconfiguring the operating environment after installing the replacement drive. The exact hot-plug procedure depends on which version of the Solaris operating environment you are using. For the complete procedure, refer to Platform Notes: Sun Enterprise 220R Server, available on the Solaris on Sun Hardware AnswerBook. This AnswerBook documentation is provided on the Solaris Supplement CD for the Solaris release you are running.

In order to perform a disk hot-plug procedure, you must know the physical or logical device name for the drive that you want to install or remove. If your system encounters a disk error, often you can find messages about failing or failed disks in your system console. This information is also logged in the /var/adm/messages file(s). These error messages typically refer to a failed disk drive by its physical device name (such as /devices/pci@1f,4000/scsi@3/sd@b,0) or by its logical device name (such as c0t11d0). In addition, some applications may report a disk slot number (0 through 1).

You can use the following table to associate internal disk slot numbers with the logical and physical device names for each disk drive.

Disk Slot Number	Logical Device Name	Physical Device Name
Slot 0	c0t0d0	/devices/pci@1f,4000/scsi@3/sd@0,0
Slot 1	c0t1d0	/devices/pci@1f,4000/scsi@3/sd@1,0

Configuration Rules

The following rules apply for your system:

■You must use Sun standard 3.5-inch wide and 1-inch high (8.89-cm x 2.5-cm) disk drives that are UltraSCSI-compatible and run at 10,000 revolutions per minute (rpm).

■The SCSI IDs for the disks are hardwired on the disk backplanes. There is no need to set any SCSI ID jumpers on the disk drives themselves. The SCSI target address (SCSI ID) of each disk drive is determined by the slot location where the drive is connected to its UltraSCSI backplane.

■The disk drives share the internal SCSI bus with the SCSI removable media devices in the removable media assembly (RMA). The removable media SCSI cable provides the termination for the internal SCSI bus.

For information about implementing RAID configurations, see “About Disk Array Configurations and Concepts” on page 70.

Chapter 4 Hardware Configuration 75