Asus PCI-DA2200 PCI-DA2200 User Guide English Version - Page 17

using a 9GB drive as the Global Spare drive for a failed drive that comes from Logical Drive 1 or 2 will bring huge amount of excess capacity since these logical drives require 4 GB only. In the settings below, the 9 GB Local Spare Drive will aid Logical Drive 0 once a drive in this logical drive failed. If the failed drive is in Logical Drive 1 or 2, the 4 GB Global Spare drive will immediately give aid to the failed drive. Local Spare Drive LS (9GB) Global Spare Drive GS (4GB) Local Spare Drive always has higher priority than Global Spare Drive. 1 2 (9GB) (9GB) 3 (9GB) Logical Drive 0 1 2 (4GB) (4GB) Logical Drive 1 1 2 (4GB) (4GB) 4 3 (4GB) (4GB) Logical Drive 2 3.2.2 Identifying Drives Assuming there is a failed drive in the RAID 5 logical drive, make it a point to replace the failed drive with a new drive to keep the logical drive working. When trying to remove a failed drive and you mistakenly removed the wrong drive, you will no longer be able to read/write the logical drive because the two drives may have already failed. To prevent this from happening, the controller provides an easy way of identifying for the failed drive. That is, the read/write LED of the failed hard drive will light. This LED will prevent you from removing the wrong drive, and is also helpful when locating for a drive. ASUS PCI-DA2200 User's Manual 3-7