Acer PCI to Ultra SCSI RAID Controllers DAC960PG Bedienungsanleitung PDF herunterladen (Seite 78)

G-20 DAC960PG and DAC960PJ Installation Guide

To use the standby rebuild feature, you should always maintain a standby

SCSI disk in your system. When a disk fails, the standby disk will

automatically replace the failed drive and the data will be rebuilt. The system

administrator can disconnect and remove the bad disk and replace it with a

new disk. The administrator can then make this new disk a standby.

The standby replacement table has a limit of 8 automatic replacements in

any session (from power-on/reset to the next power-off/reset). When the

limit of 8 is reached and a disk failure occurs, the standby replacement will

occur but will not be recorded in the replacement table.

To clear the “standby replacement” table, reboot the system from a DOS

bootable floppy, run the configuration utility and select the option ‘view/

update configuration’ from the main menu. A red box labeled ‘Drive Remap

List’ will be displayed. Selecting the box will allow you to continue. You

should save the configuration without making any changes, and exit the

configuration utility. This will clear the replacement table. You may now

proceed to boot your system and continue normal operations.

In normal use, the replacement table limit of 8 should not cause any

problems. Assuming that a disk fails about once a year (drives we support

generally come with a 5-year warranty), the system would run continuously

for a minimum of eight years before the table would need to be cleared.

Stripe Order

The order in which SCSI disk drives appear within a drive group. This order

must be maintained, and is critical to the controller’s ability to “rebuild”

failed drives.

Stripe Size

The size, in kilobytes (1024 bytes) of a single I/O operation. A stripe of data

(data residing in actual physical disk sectors, which are logically ordered

first to last) is divided over all disks in the drive group.

Stripe Width

The number of striped SCSI drives within a drive group.

Striping

The storing of a sequential block of incoming data across multiple SCSI

drives in a group. For example, if there are 3 SCSI drives in a group, the data

will be separated into blocks and block 1 of the data will be stored on SCSI

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Acer PCI to Ultra SCSI RAID Controllers DAC960PG Bedienungsanleitung Seite 78