Mylex AcceleRAID 250 Informations techniques télécharger pdf (Page 54)

How Do I Do an Assisted Configuration?

2-12 RAID EzAssist User’s Manual

☞ If you prefer a RAID 0 striping or a JBOD configuration and

fault tolerance is not a consideration, use the arrow key to select

No, then press Enter.

❑ Spare Drive?

The Spare Drive screen is displayed under the following conditions:

• Fault Tolerance = YES, AND

• Number of Unconfigured Drives on Controller > 3

☛ Note

If you have two unconfigured drives on this controller,

you’ll get a RAID 1 (mirroring) configuration. If you

have three unconfigured drives, you’ll get a RAID 5

(striping with parity) configuration. In both cases no

drive would be available to act as a spare, so you will

therefore NOT see the Spare Drive choice screen.

Assuming your situation meets the conditions above, the Spare Drive screen

is displayed (Figure 2-10).

Figure 2-10. Do You Want a Spare Drive?

A spare drive (hot spare or standby drive) offers an additional level of fault

tolerance for existing fault tolerant arrays. If a drive in the array fails, the

presence of a spare drive allows the failed drive’s data to be rebuilt onto the

spare. After rebuild is complete, the array could still accept another drive

failure with no loss of data (although there would be degraded performance).

It is usually beneficial to reserve a spare drive for the array, if you can afford

not to use the capacity of the drive for array data storage.

Reserving a spare drive lowers the total useable capacity of the array by the

capacity of that spare drive.

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Mylex AcceleRAID 250 Informations techniques Page 54