AMD SB750 Manual de usuario descargar pdf (Pagina 31)

Chapter 3: Technology Background

Stripe Block Size

For RAID 0, 5, and 10 logical drives, the stripe block size value can be set to

64 KB or 128 KB. 64 KB is the default. Your choice will directly affect

performance. There are two issues to consider when selecting the stripe block

size.

• Choose a stripe block size equal to or smaller than the smallest cache buffer

found on any physical drive in your logical drive. A larger value slows the

logical drive down because physical drives with smaller cache buffers need

more time for multiple accesses to fill their buffers.

• If your data retrieval consists of fixed-size data blocks, such as some

database and video applications, choose that data block size as your stripe

block size.

Generally speaking, email, POS, and webservers prefer smaller stripe block

sizes. Video and database applications prefer larger stripe block sizes.

Gigabyte Boundary

The Gigabyte Boundary feature is designed for logical drives in which a drive has

failed and the user cannot replace the drive with the same capacity or larger.

Instead, the Gigabyte Boundary feature permits the installation of a replacement

drive that is slightly smaller (within 1 gigabyte) than the remaining working drive

(for example, an 80.5GB drive would be rounded down to 80GB). This can be

helpful in the event that a drive fails and an exact replacement model is no longer

available.

Gigabyte Boundary is available for all RAID levels. If you split the capacity of your

physical drives between two logical drives, you can choose Gigabyte Boundary

for the second logical drive. See “Creating a Logical Drive” on page 9.

Initialization

In RAID Option ROM, there are two options for Initialization:

• Fast Initialization – Preferred

• No Initialization

Fast Initialization sets the data bits of the physical drive’s Master Boot Record

(MBR) to zero. Any other data on the physical drive remains untouched, however

you can no longer access the data because the MBR has been overwritten.

Fast Initialization is available for all RAID levels. The process happens

immediately when the logical drive is created and takes only a moment. See

“Creating a Logical Drive” on page 9.

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AMD SB750 Manual de usuario Pagina 31