Ciprico 6500 manual Types of Rebuilds

Chapter 4 Maintenance, Troubleshooting & Hardware Replacement

Types of Rebuilds Page 4 - 25

Types of Rebuilds

The next task required is to rebuild data onto the new drive in the array.

In this nine-disk array, eight drives are used for data storage and the ninth for parity checking. No matter which drive is replaced, it is possible to use the remaining drives to reconstruct the missing information.

Off-Line Rebuild

An off-line rebuild occurs when the subsystem is off-line and remains off-line throughout the rebuild process. During an off-line rebuild the array will be unavailable for use. To complete the rebuild in the shortest amount of time, do an off-line rebuild, with the percentage of time dedicated to rebuilding set to 99%.

Percentage Rebuild

A percentage rebuild occurs when the subsystem is on-line. During a percentage rebuild the drive's data is rebuilt concurrent with other operations. The percentage of time allotted to the rebuild process can be selected via the display/operation panel. Completion time for a percentage rebuild will vary with the percentage selected and the intensity of system activity directed at the array and the size of the disk.

During Rebuild

Following is a brief description of what happens as the array rebuilds a drive. The controller board will:

1.Apply power to the replacement drive's drive spindle motor, spinning up the drive.

2.Rebuild the data. In this step, data is read from other drives and reconstructed on the new drive.

Note If the rebuild is interrupted, for example, if the array is powered down or the rebuild is canceled, the process will terminate in an orderly manner. However, when the rebuild is re-initiated, it will not resume where it stopped but will start over, repeating both of the above steps.

Completing	Upon completion of the rebuild process, the display/operation panel will revert
the Rebuild	from67$786indicating￿2.the type of rebuild in process and will display 5(%8,/''21(
	. Subsystem operation will continue normally.

6500 Disk Array User’s Guide 21020690 B