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Features 31
• The replacement disk must be of the same protocol and disk technology.
For example, only a SAS hard drive can replace a SAS hard drive; only a
SATA SSD can replace a SATA SSD.
• The replacement disk must be of equal or greater capacity than the one
it is replacing.
Using Replace Member and Revertible Hot
Spares
The Replace Member functionality allows a previously commissioned hot
spare to be reverted to a usable hot spare. When a disk failure occurs within
a virtual disk, an assigned hot spare (dedicated or global) is commissioned
and begins rebuilding until the virtual disk is optimal. After the failed disk is
replaced (in the same slot) and the rebuild to the hot spare is complete,
the controller automatically starts to copy data from the commissioned hot
spare to the newly-inserted disk. After the data is copied, the new disk is a
part of the virtual disk and the hot spare is reverted to being a ready hot spare.
This allows hot spares to remain in specific enclosure slots. While the
controller is reverting the hot spare, the virtual disk remains optimal.
NOTE: The controller automatically reverts a hot spare only if the failed disk is
replaced with a new disk in the same slot. If the new disk is not placed in the same
slot, a manual Replace Member operation can be used to revert a previously
commissioned hot spare.
NOTE: A Replace Member operation typically causes a temporary impact to disk
performance. Once the operation completes, performance returns to normal.
Controller Cache Preservation
The controller is capable of preserving its cache in the event of a system
power outage or improper system shutdown. The PERC H710, H710P, and
H810 controllers are attached to a Battery Backup Unit (BBU) that provides
backup power during system power loss to preserve the controller's cache
data.