Dell Lifecycle Controller 1.5 Instrukcja Użytkownika Pobierz pdf (Strona 77)

USC and USC-LCE Operations 77

• Select the span length from the

Select Span Length

drop-down menu.

The span length value refers to the number of physical disks included in

each span. Span length applies only to RAID 10, RAID 50, and RAID 60.

The

Select Span Length

drop-down menu is active only if the user has

selected RAID-10, RAID-50, or RAID 60.

• Select the physical disks using the check boxes at the bottom of the screen.

Your physical disk selection must meet the requirements of the RAID level

and span length. To select all of the physical disks, click

Select All

Click Next after making your selections.

Advanced Wizard Only - Additional Settings

Use the Additional Settings screen to specify cache policies and stripe

element size. You can also assign a hot spare to the virtual disk.

• Specify the size of the virtual disk in the

Size

box

• Select the stripe element size from the

Stripe Element Size

drop-down

menu. The stripe element size is the amount of disk space a stripe

consumes on each physical disk in the stripe. The

Stripe Element Size

drop-down menu may contain more options than initially displayed on the

screen. Use the up-arrow and down-arrow keys to display all options.

• Select the read policy from the

Read Policy

drop-down menu.

–

Read Ahead

— The controller reads sequential sectors of the virtual

disk when seeking data. The Read Ahead policy may improve system

performance if the data is written to sequential sectors of the virtual

disk.

–

No Read Ahead

— The controller does not use the Read Ahead policy.

The No Read Ahead policy may improve system performance if

the

data is random and not written to sequential sectors.

–

Adaptive Read Ahead

— The controller initiates the Read Ahead

policy only if the most recent read requests accessed sequential sectors

of the disk. If the recent read requests accessed random sectors of the

disk, then the controller uses the No Read Ahead policy.

• Select the write policy from the

Write Policy

drop-down menu.

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