
Using the Storage Subsystem 7-9
Compaq Confidential – Need to Know Required
Writer: Robert Young Project: Compaq AlphaServer DS20E System Comments:
Part Number: ER-K8F6W-UA .A01 File Name: h-ch7 Using the Storage Subsystem.doc Last Saved On: 10/4/99 11:13 AM
Hot Swap
The storage subsystem backplane is designed to support hot-swap. This
allows you to install or remove drives while the backplane is powered and
operating.
Hot-swap uses the high profile SCA-2 connector type which have long and
short pin lengths. The long pin lengths make connection first and provide a
ground connection to the drive and a current limited connection to the power
precharge pins. This allows for a removal or installation of non-operating
drives and does not affect the power for the drives that are in operation.
CAUTION: It is not recommended that a drive be removed when that drive is in
operation. A drive should only be removed when the Activity LED is off.
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