Hard Drive Installation and Replacement
Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache User Guide
D-9
COMPAQ CONFIDENTIAL
Writer: Amy L. Laffitte File Name: m-appd Hard Drive Installation and Replacement
Codename: Executor Part Number: 266328-001 Last Saved On: 4/18/02 2:51 PM
To minimize the likelihood of fatal system errors, take these precautions when
removing failed drives:
•
Do not remove a degraded drive if any other member of the array is offline (the
Online LED is off). In this condition, no other drive in the array can be removed
without data loss.
There are some exceptions:
—
When RAID 1+0 is used, drives are mirrored in pairs. Several drives can be
in a failed condition simultaneously (and they can all be replaced
simultaneously) without data loss, as long as no two failed drives belong to
the same mirrored pair.
—
When RAID ADG is used, two drives can fail simultaneously (and be
replaced simultaneously) without data loss.
—
If an online spare has an unlit Online LED (it is offline), the degraded drive
can still be replaced.
•
Do not remove a second drive from an array until the first failed or missing drive
has been replaced
and
the rebuild process is complete. (When the rebuild is
complete, the Online LED on the front of the drive stops blinking.)
There are some exceptions:
—
In RAID ADG configurations, any two drives in the array can be replaced
simultaneously.
—
In RAID 1+0 configurations, any drives that are not mirrored to other
removed or failed drives can be simultaneously replaced offline without data
loss.
Moving Drives and Arrays
Drives can be moved to other ID positions on the same array controller. You may
also move a complete array from one controller to another (even if the controllers are
on different servers). However, if you combine arrays that were on different
controllers into one larger array on a single controller, the data on the arrays is lost.
