H3C UniServer R4900 G5 User Manual

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Storage controller features
The available features vary by storage controller model. For more information, see H3C Servers
Storage Controllers Technical Specifications.
Hot spare drives
About hot spare drives
You can configure hot spare drives to improve data security. One or multiple independent drives in
the drive system can function as hot spare drives. When a drive in a redundant RAID fails, a spare
drive automatically replaces the failed drive and rebuilds the data of the failed drive, enhancing the
fault tolerance of the system.
From the management interface or CLI of a storage controller, you can specify a hot spare drive for
the RAID. Make sure the following conditions are met:
•
The hot spare drive is idle and of the same media type as a RAID member drive.
•
The capacity of the hot spare drive is equal to or larger than a RAID member drive.
Hot spare drives include the following types:
•
Global Spare—Specifies a hot spare drive for all the redundant RAIDs. You can specify one or
multiple global spare drives. A global spare drive can replace any failed drive in any redundant
RAID. When the storage controller detects that a new drive replaces the failed drive, states of
the spare and new drives vary by support of the storage controller for data copyback:
 If the storage controller supports copying data on the global spare drive back to the new
drive, the new drive becomes a RAID member drive and the global spare drive is placed in
standby status.
 If the storage controller does not support copying data on the global spare drive back to the
new drive, the global spare drive becomes a RAID member drive and the new drive is idle.
You can configure the new drive as a hot spare drive from the management interface or
CLI.
•
Dedicated Spare—Specifies a hot spare drive for a specific redundant RAID. You can specify
one or multiple dedicated spare drives for a redundant RAID. A dedicated spare drive can
replace a failed drive in the specific RAID. When the storage controller detects that a new drive
replaces the failed drive, states of the spare and new drives vary by the support of the storage
controller for data copyback:
 If the storage controller supports copying data on the dedicated spare drive back to the
new drive, the new drive becomes a RAID member drive and the dedicated spare drive is
placed in standby status.
 If the storage controller does not support copying data on the dedicated spare drive back to
the new drive, the dedicated spare drive becomes a RAID member drive and the new drive
is idle. You can configure the new drive as a hot spare drive from the management
interface or CLI.
•
Auto Replace—Specifies a hot spare drive for a specific redundant RAID. Only P460 and
H460 storage controllers support auto replace spare drives. You can specify one or multiple
auto replace spare drives for a redundant RAID. An auto replace spare drive can replace a
failed drive in the specific RAID. When the storage controller detects that a new drive replaces
the failed drive, it will not copy data on the auto replace spare drive back to the new drive and
place the new drive in standby status.
•
Pooled Spare—Specifies a hot spare drive for a RAID array set. You can specify one or
multiple pooled spare drives for a RAID array set. A pooled spare drive can replace a failed
drive in the RAID set. When the storage controller detects that a new drive replaces the failed

H3C UniServer R4900 G5 Specifications

General

Brand	H3C
Model	UniServer R4900 G5
Category	Server
Language	English