Hp NetRAID 1Si Controller Manual de usuario descargar pdf (Pagina 105)

5 Reconstructing and Rebuilding

Drives

Reconstructing and rebuilding are two important features of HP NetRAID

systems. It is important to know the difference between these two terms.

• Reconstructing is the process of reorganizing data when you make a

fundamental change to your system such as changing RAID levels. See

"Reconstructing Data" in this chapter for more information.

• Rebuilding is the process of recreating data on a replacement drive after a

drive failure. See "Rebuilding Data" in this chapter for more information.

Reconstructing Data

Reconstruction is the process of reorganizing data to correspond with a change in

the HP NetRAID system. The following changes require reconstructing your data:

• Adding a physical drive to an existing logical drive.

• Removing a physical drive from an existing logical drive.

• Changing a logical drive from one RAID level to another.

NOTE Reconstruction can be done only on arrays containing just one

logical drive each. HP NetRAID cannot reconstruct an array

using array spanning or arrays containing multiple logical

drives.

Reconstruction occurs in the background, so the HP NetServer and the affected

drives remain available throughout the reconstruction process.

The reconstruction rate is about 80 to 180 MB per minute (depending on drive

performance, system loading, and whether or not you have enabled the Power Fail

Safeguard parameter). Count the capacity to be reconstructed as the number of

physical drives participating in the reconstruction multiplied by drive capacity.

Power Fail Safeguard Feature

The Power Fail Safeguard feature (PFS) allows users to protect a disk array during

the reconstruction process should a power failure occur. When you use this

feature, a copy of the data currently being reorganized always remains on disk, so

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Hp NetRAID 1Si Controller Manual de usuario Pagina 105