Rocstor GUARDIAN 4RT, Installation And Configuration Manual

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ROCSECURE – Guardian 4RT Secure Raid System User Manual Page | 110
Online RAID Level and Stripe Size Migration
User can do migration on both the RAID level and Stripe Size of an existing Volume Set while
the server is online and the Volume Set is in use. Online RAID level/stripe size migration can
prove helpful during performance tuning activities as well as in the event that additional
physical disk is added to the RAID. For example, in a system using two drives in RAID level 1,
you could add capacity and retain fault tolerance by adding one drive. With the addition of
third disk, you have the option of adding this disk to your existing RAID logical drive and
migrating from RAID level 1 to 5. The result would be parity fault tolerance and double the
available capacity without taking the system off-line.
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