Nvidia ST380023AS Manuale Utente Scaricare il pdf (Pagina 7)

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HAPTER 1

About NVIDIA RAID

RAID 1

How RAID 1 Works

In a RAID 1 array, every read and write is carried out in parallel across two disk drives.

The mirrored—or backup—copy of the data can reside on the same disk or on a second

redundant drive in the array. RAID 1 provides a hot-standby copy of data if the active

volume or drive is corrupted or becomes unavailable due to a hardware failure. RAID 1

techniques can be applied for high-availability solutions, or as a form of automatic backup

that eliminates tedious manual backups to more expensive and less reliable media.

Figure 1.2

RAID 1 Array Diagram

RAID 1 provides complete data redundancy, but at the cost of doubling the required data

storage capacity, resulting in 50% capacity utilization. Performance is roughly the same as

for a single drive, although in some instances the dual write may be somewhat slower.

Summary of Features and Benefits

• Benefits: Provides 100% data redundancy. Should one drive fail, the controller

switches to the other drive.

• Drawbacks: Requires two drives for the storage space of one drive. Performance is

impaired during drive rebuilds.

• Uses: RAID 1 is ideal for small databases or any other application that requires fault

tolerance and minimal capacity.

• Drives: Minimum, 2. Maximum, 2.

• Fault Tolerance: Yes

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Nvidia ST380023AS Manuale Utente Pagina 7