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Should one of the drives failed, parity data can be used to rebuild the failed data. Under RAID 5, parity data is stored across all drives in the array. This maximizes the amount of storage capacity available from all drives in the array while still providing data redundancy. RAID 5 requires at least three drives. The ACS-77100 allows user to set RAID 5 with three drives and the fourth drive as a hot-spare drive ready to be used for rebuilding data in case one of the other drives fails. The diagram above represents the writing of data on a RAID 5 array composed of four disks connected to the controller. Parity blocks are represented by the letter P Characteristics .. Each entire data block is written on a data disk. Parity for blocks in the same rank is generated on Writes, recorded in a distributed location and checked on Reads. .. Highest Read data transaction, medium Write data transaction rate. .. Relatively low ratio of ECC (Parity) disks to data disks means high efficiency (compared to other RAID levels). .. Good aggregate transfer rate. Recommended Uses .. File and application servers. .. Database servers. .. Web, Email servers. .. Internet server 2. Build a RAID Solution This chapter covers the installation of the ACS-77100. The customers will be guided to using ACS-77100 to build a RAID solution. 2.1. Hardware Requirement: .. ACS-77100 RAID controller .. Backplane or Disk I/O board .. Disk carriers (with LED Indicators) .. Power supply .. Fan module .. Chassis .. Other materials .. SATA disk cable .. Header to DB9 cable .. SATA to eSATA internal cable .. Selector (with header connector + cable) 2.2. LCD Panel Operations The LCD messages are displayed on the screen of LCD panel for system status. ^: Scroll up button Ў: Scroll down button ENT: Enter button ESC: ESC button Scroll up button: to scroll up message data. Scroll down button: to scroll down message data. Enter button: to confirm or enter your selection. ESC button: back to the top layer of message data. Power LED Access LED Caution The ACS-77101 must be powered off to change the RAID level. Caution If there is data on the array, changing the RAID level will cause loss of all the data on the array. 3. Set up the RAID solution This chapter covers the configuration of the ACS-77100. Through an easy process, the customers will be guided to configure the ACS-77100 through the following steps: Step 1 3.1. Setting the RAID level – The ACS-77100 is per-configured at RAID level 5, but you have the option of customizing your RAID level in this step Step 2 3.2. Creating an Array – The disks in ACS-77100 will be used to create an array, by which you can partition and use the storage. Step 3 3.3. Setting the Date and Time – Configure your ACS-77100 for your local use. Step 4 3.4. Connecting to a Host computer – Connecting the ACS-77100 to your host computer through eSATA interface. Step 5 3.5. Formatting and Partitioning the ACS-77100 – This section details the process for formatting and partitioning the ACS-77100 on Windows operating system. 3.1. Setting the RAID Level The RAID level of ACS-77100 is set using jumper heads on the RAID Configuration Interface (Pin1, 3, 5, 7 of the CN8). The four possible combinations of the jumper position correspond to the four available RAID settings: 0, 0+1, 5 and 5+spare. Note If the RAID level is not matched between the disk setting and the RAID level selector setting, the LCD will display the following two messages alternatively: (1) “RAID level” “Unmatched” (2) “Current: R(X)” (i.e. the current RAID level setting of RAID level selector.) “Original: R(Y)” (i.e. the original RAID level setting of the installed disks.) Solution: At this situation, RAID cannot work, users should choose one of the following options : (1) Shut down and tune the RAID level selectors to R(Y). (2) Re-plug the four disks and re-create the Array to R(X). (But data in the RAID will be lost due to the destructive initialization ) 3.1.1 RAID Level configurations RAID Level 5 RAID Level 0 Pin1-3 is open. Pin5-7 is open. Pin1-3 is short. Pin5-7 is short. RAID Level 10 RAID Level 5 + spare Pin1-3 is short. Pin5-7 is open. Pin1-3 is open. Pin5-7 is short. Note If you want to create the array with over 2TB capacity, the setting must be finished before to create an array. Note During the RAID-creating procedure, the percentage of RAID initialization progress will be displayed on the LCD panel. Note The initialization process is a time-intensive process and is dependent upon the size of the disks. For example, four 400GB disks in a RAID 5 array could take over about two hours. 3.2. Creating an Array 3.2.1 Enable/Disable Over 2TB capacity ACS-77100 supports over 2...

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