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Hot-Pluggable Hard Drives
Hot-Pluggable hard drives used in combination with the Compaq Smart SCSI Array Controller
can be replaced while the power is still on.
NOTE: It is not necessary to set the SCSI ID jumpers on a Compaq replacement Hot-
Pluggable hard drive. The SCSI ID is set automatically by the backplane board and the
Hot-Pluggable tray when the drive is installed.
CAUTION: Before removing any Hot-Pluggable hard drive, read the guidelines listed in
the following section.
Important Guidelines About Replacing
Hot-Pluggable Hard Drives
When a drive configured for fault tolerance is replaced, the replacement drive will
automatically begin being restored when it is installed. When a drive is in the process of being
restored, the On-line LED will flash green. The LED will continue to flash until the drive is
completely restored.
Figure 2-8. Hot-Pluggable Hard Drive LED Indicators
When replacing Hot-Pluggable hard drives, these guidelines must be followed:
Never remove more than one drive at a time. When a drive is replaced, the controller uses
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data from the other drives in the array to reconstruct data on the replacement drive. If more
than one drive is removed, a complete data set is not available to reconstruct data on the
replacement drive(s).
Never remove a working drive when another drive has failed. Drives that have been
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failed by the controller are indicated by the amber Drive Failure LED on the drive tray.
Permanent data loss will occur if a working drive is removed when replacing a failed drive.
Removal and Replacement Procedures
Maintenance and Service Guide
2-7
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