Apple Workgroup Server 8550 - Manual (Page 113)

Solving hard disk problems
If you can’t start up from a hard disk or you don’t see the hard disk icon on
the desktop, try the following:
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Shut down your server and turn off any external disk devices.
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Check the ID numbers of all SCSI equipment connected to your server.
The Workgroup Server 7250 has one SCSI bus, and the Workgroup Server
8550 has two SCSI buses. On a Workgroup Server 7250, all SCSI devices
must have unique ID numbers because they are on the same SCSI bus.
On the Workgroup Server 8550, devices on different SCSI buses can have
the same SCSI ID number. See the setup guide that came with your
server for information about SCSI ID assignments for factory-installed
devices.
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Check that each SCSI bus is terminated properly. For information about
terminating a SCSI bus, see the setup guide that came with your server
and the manuals that came with your SCSI equipment.
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Remove devices that you do not use. Apple recommends that you
remove SCSI devices that are turned off and are not used. Removing
unused devices avoids signal strength problems for the remaining
devices on the bus.
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Remove SCSI-1 devices if you are also using SCSI-2 devices. Older disks,
usually under 200 MB in size, cause problems when they are connected
to a SCSI bus to which SCSI-2 devices are also connected. Most older
disks are SCSI-1 compliant and are not always compatible with SCSI-2
devices.
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If the hard disk is internal, wait at least 10 seconds, and then turn your
server on again.
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If the hard disk is external, make sure that it is turned on and that its
cable is connected firmly; then restart the server.
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If the hard disk is your startup disk, start up with a different startup disk.
(For details, see “Starting Up From a CD-ROM Disc” in Chapter 4.) If the
hard disk’s icon appears on your desktop, reinstall system software on
the hard disk. See “Installing System Software” in Chapter 4.
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Follow the instructions in the next section, “How to Test a Hard Disk.”
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