APC RAID Subsystem SCSI-SATA II Informações Técnicas descarregar pdf (Página 44)

Using the RAID GUI

2-19

• Delete disk groups

Select the disk group(s) you want to delete and click Delete.

• Modify disk groups

To modify a setting, select a DG and click Modify. Specify the following options for configuration.

Capacity to Truncate

(GB)

Specifies the capacity to be truncated for the smallest disk of this disk group.

This option is useful when the replacement disk that is slightly smaller than the

original disk. Without this option, the capacity to truncate is 0GB.

LD Initialization Mode The initialization mode defines how logical disks of a disk group are initialized.

Different disk groups can have different initialization modes.

Parallel: The initialization tasks of logical disks are performed concurrently.

Sequential: Only one initialization task is active at a time.

Write-zero immediately When enabled, this function will start a background task to write zero to all member

disks of the created disk group. The disk group can be used for logical disks only

after this process is completed.

Note

The minimum number of member disks in a disk group is two. Different disk groups may have a

different number of member disks. The number of member disks also determines the RAID level

that can be used in the disk group.

Name Type a name associated for the DG ID.

Spare Disks Assign disks to be used as local spares.

Disk Cache This option enables or disables the on-disk cache of hard disks in a disk group.

When a new disk becomes a member of the disk group (for example, by disk

rebuilding and cloning); the on-disk cache uses the same settings as the disk

group.

LD Initialization Mode The initialization mode defines how logical disks of a disk group are initialized.

Different disk groups can have different initialization modes.

Parallel: The initialization tasks of logical disks are performed concurrently.

Sequential: Only one initialization task is active at a time.

LD Rebuild Mode This determines how to rebuild logical disks in a disk group. All logical disks can be

rebuilt at the same time or one at a time. Different disk groups can have different

rebuild modes.

Parallel: The rebuilding tasks are started simultaneously for all logical disks in the

disk group. The progress of each rebuilding task is independent from each other.

Sequential: Rebuilding always starts from the logical disk with the smallest relative

LBA on the disk group, continues to the logical disk with the second smallest

relative LBA, and so on.

Prioritized: Similar to sequential rebuild mode, this rebuilds one logical disk at a

time, but the order of logical disks to be rebuilt can determined by users.

Rebuild Task Priority Low / Medium / High

This option sets the priority of the background task for disk rebuild of disk groups.

Initialization Task

Priority

Low / Medium / High

This option sets the priority of the background tasks for logical disk initialization of

disk groups.

Utilities Task Priority Low / Medium / High

This option sets the priority of the background tasks for utilities of disk groups.

These include RAID reconfiguration utilities and data integrity maintenance utilities.

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