User`s guide

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5: Troubleshooting
RAID Guidelines
RAID stands for “redundant array of independent disks”. In a RAID system multiple
disk drives are grouped into arrays. Each array is configured as system drives consisting
of one or more disk drives. A small, but important set of guidelines should be followed
when connecting devices and configuring them to work with a controller.
Follow these guidelines when configuring a RAID system:
• Distribute the disk drives equally among all the drive channels on the controller.
This results in better performance. The TP9100 has two drive channels.
• A drive pack can contain a maximum of 16 drives.
• A drive pack can contain drives that are on any drive channel.
• If configuring an online spare disk drive, ensure that the spare disk drive capacity is
greater than or equal to the capacity of the largest disk drive in all redundant drive
packs.
• When replacing a failed disk drive, ensure that the replacement disk drive capacity
is greater than or equal to the capacity of the failed disk drive in the affected drive
pack.
Solving Initial Startup Problems
If cords are missing or damaged, plugs are incorrect, or cables are too short, contact your
supplier for a replacement.
If the alarm sounds when you power on the storage system, one of the following
conditions exists:
• A fan is slowing down. See “Power Supply/Cooling Module LEDs” on page 84 for
further checks to perform.
• Voltage is out of range. The tower requires 115/220 Volts (autoranging), and the
rack requires 200-240 Volts (autoranging).
• There is an overtemperature or thermal overrun condition. See “Solving Storage
System Temperature Issues” on page 92.