
ROCSECURE – Rocserve 4RMe Secure Raid System
User Manual
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High Availability
Creating Hot Spares
A hot spare drive is an unused online available drive, which is ready to replace a failed disk
drive. In a RAID level 1, 0+1, 3 or 5 Raid Set, any unused online available drive installed that
does not belong to a Raid Set can be defined as a hot spare drive. Hot spares permit you to
replace failed drives without powering down the system. When the RAID detects a drive
failure, the system will do automatic and transparent rebuild using the hot spare drive. The
Raid Set will be reconfigured and rebuilt in the background while the RAID continues to
handle system requests. During the automatic rebuild process, system activity will continue
as normal, however, the system performance and tolerance will be affected.
IMPORTANT: The hot spare must have at least the same or more capacity as
the drive it replaces.
Hot-Swap Disk Drive Support
The RAID has a built-in protection circuit to support the replacement of SATA II hard
disk drives without having to shut down or reboot the system. The removable hard drive
tray can deliver “hot swappable” fault-tolerant RAID solution at a price much less than
the cost of conventional SCSI hard disk RAID. This feature is provided in the RAID for
advance fault tolerant RAID protection and “online” drive replacement.
Hot-Swap Disk Rebuild
The Hot-Swap feature can be used to rebuild Raid Sets with data redundancy such as
RAID level 1, 0+1, 3 and 5. 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
automatically and transparently rebuilds failed drives in the background with user-
definable rebuild rates. The RAID will automatically continue the rebuild process if the
host system is shut down or powered OFF abnormally during a reconstruction process.
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