7-2
Cisco UCS Server Configuration Utility, Release 5.0
OL-32096-01
Chapter 7 Configuring RAID Levels
RAID Configuration
• Link Speed—The link speed of the controller.
• Logical Disk—The logical disk to which the physical disk belongs to.
Table 7-1 describes the various disk status conditions.
Logical Disks Table
The logical disks pane in the RAID Configuration page displays the information about the logical disks.
Table 7-2 explains the RAID array attributes.
Table 7-1 Disk Status Conditions
Status Condition Description
Online The drive is already used in another array.
Global Hotspare The drive will be used to repair any array in the system that had a drive
failure, if the failed drive is equal to, or smaller than the hot spare drive.
Unconfigured Good The drive is unused or available.
Ready The drive is online and operating correctly.
Offline The drive is offline or absent. No actions can be performed on the drive
until it is back online.
Unconfigured Bad The drive is not operational and needs to be replaced.
Disks with a status of "Unconfigured bad" cannot be used for RAID
configurations.
Foreign The drive is part of an array created on a different controller, or created
within one enclosure and moved to another on the same controller. It can
be used to create a new array after clearing the configuration.
Table 7-2 RAID Array Attributes
Option Description
ID Unique ID to the logical disk.
Size Logical drive size. The maximum value depends on RAID level selected and the
physical disks size involved.
Primary RAID
level
RAID 0 (Data striping), 1 (Disk Mirroring), 5 (Data Striping with Striped
Parity), 6 (Distributed Parity and Disk Striping).
Secondary
RAID Level
Applicable only for nested RAID levels.
Stripe size Size of the data stripe across all disks. Each physical disk has a smaller stripe
of data. The sum of all the stripes equals the stripe size.
Read policy No Read Ahead, Read Ahead, Adaptive. Read Ahead will read additional
consecutive stripes. Adaptive will turn on Read Ahead for sequential reads and
turn it off for random reads.
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