NOTE: The system automatically assigns RAID level 0 to any logical drives defined in an array containing only one hard disk drive. When this is the case, the Select RAID Level pop-up window will not appear.
If you have only two hard disk drives in the array, the Select RAID Level pop-up window appears, but RAID level 5 is not selectable because you need at least three hard disk drives in an array to assign RAID level 5 to one of the logical drives. You can define more than one logical drive for the array. The only restriction is that the maximum number of logical drives you can define is eight.
NOTE: Because the level you assign can influence the space needed for the drive, you must assign a RAID level before you enter the size of the logical drive.
The Logical Drive list contains the logical drive ID, the size of each logical drive, the RAID level you assigned to that logical drive, and the date that the logical drive was created.
The status of the logical drive also is shown. Good means that all is well with the drive. Critical means that you must replace the hard disk drive or do a rebuild operation. (You will have received a message telling you what has happened to the drive.) Offline means that the logical drive is unrecoverable, the data on that drive is lost.
The Logical Drive Size pop-up window shows the space in the array that is available for logical drives.
Information about the new logical drive appears in the Logical Drive list.
NOTE: The size appearing in the Logical Drive list might be different from the size you typed. (binary equivalent) The size of a logical drive is determined by a number of factors, but basically the size must be divisible by the number of drives in the array.
Consider the following scenarios:
The array consists of three 1GB drives. You assign RAID level 0 (which uses all the drives in the array with no parity storage), and type 1000MB . The number in the Size (MB) field will be 999, which is the number closest to and lower than 1000 that is divisible by 3.
The array consists of three 1GB drives, and you assign RAID level 5. Data is striped across all three drives in the array, but the space equivalent to that of one drive is used for parity storage. Therefore, if you type 1000MB , the number in the Size (MB) field remains 1000 because it is divisible by 2 (drives), which is the space available for data.
If you do not use the entire array for this logical drive, you can create another by assigning either the same or a different RAID level for an additional logical drive. You can have as many as eight logical drives among four disk arrays.
If you select Yes in the Confirm pop-up window, information in the logical drive will be overwritten with zeros.
The initialization process begins, and you can see its progress in the Pct. Int. (Percent Initialized) column of the Logical Drive list.
Follow the instructions on the screen. A pop-up window shows the default file name of CONFIG. You can change the file name by typing over the default. The Backup program will assign a file-name extension of .dmc .
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