Installation guide

Chapter 1. Introduction
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replaces. The host spare function only works with RAID level 1, 1E, 3, 5, 6, 10,
30, 50, or 60 volume set.
The “Create Hot Spare” option gives you the ability to define a global / dedicated
hot spare disk drive. To effectively use the hot spare feature, you must always
maintain at least one drive that is marked as a global hot spare.
Note
The hot spare must have at least the same capacity as the drive it
replaces.
1.1.8 Hot-Swap Disk Drive Support
The RAID subsystem has built the protection circuit to support the replacement
of SAS/SATA hard disk drives without having to shut down or reboot the system.
The removable hard drive tray can deliver “hot swappable,” fault -tolerant RAID
solutions at prices much less than the cost of conventional SCSI hard disk RAID
subsystems. We provide this feature for controllers to provide the advanced
fault tolerant RAID protection and “online” drive replacement.
1.1.9 Hot-Swap Disk Rebuild
A Hot-Swap function can be used to rebuild disk drives in arrays with data
redundancy such as RAID level 1, 1E, 3, 5, 6, and x0. If a hot spare is not
available, the failed disk drive must be replaced with a new disk drive so that the
data on the failed drive can be rebuilt. If a hot spare is available, the rebuild
starts automatically when a drive fails. The RAID subsystem automatically and
transparently rebuilds failed drives in the background with user-definable
rebuild rates. The RAID subsystem will automatically restart the system and the
rebuild if the system is shut down or powered off abnormally during a
reconstruction procedure condition. When a disk is Hot Swap, although the
system is functionally operational, the system may no longer be fault tolerant.
Fault tolerance will be lost until the removed drive is replaced and the rebuild
operation is completed.