Proware DP-503-F4A3, Installation And User Manual

Page: 22 / 84

DP-503-F4A3 RAID SUBSYSTEM
22 Installation and User Manual
1.5.3.4 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 event that additional physical disks are added to the
RAID subsystem. 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.
1.5.4 High Availability
1.5.4.1 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, 5 or 6 Raid Set, any unused online available drive installed but not belonging to