Dell DSS 1510 Lifecycle Controller v2.40.40.40 Users Guide - Page 46

Selecting RAID levels, Selecting physical disks, Selecting a RAID controller

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NOTE: RAID 0 does not provide data redundancy and hot spare. Other RAID levels provide data redundancy and enable you to reconstruct data in the event of a disk-drive failure. NOTE: You can create only one virtual disk using Lifecycle Controller. To create multiple virtual disks, use Option ROM. To access Option ROM, press during boot or POST. Selecting a RAID controller The View Current RAID Configuration and Select Controller page displays all supported RAID controllers attached to the system. Select the RAID controller on which you want to create the virtual disk, and then click Next. Selecting RAID levels Select a RAID Level for the virtual disk: • RAID 0 - Stripes data across the physical disks. RAID 0 does not maintain redundant data. When a physical disk fails in a RAID 0 virtual disk, there is no method for rebuilding the data. RAID 0 offers good read and write performance with zero data redundancy. • RAID 1 - Mirrors or duplicates data from one physical disk to another. If a physical disk fails, data can be rebuilt using the data from the other side of the mirror. RAID 1 offers good read performance and average write performance with good data redundancy. • RAID 5 - Stripes data across the physical disks, and uses parity information to maintain redundant data. If a physical disk fails, the data can be rebuilt using the parity information. RAID 5 offers good read performance and slower write performance with good data redundancy. • RAID 6 - Stripes data across the physical disks, and uses two sets of parity information for additional data redundancy. If one or two physical disks fail, the data can be rebuilt using the parity information. RAID 6 offers good data redundancy and read performance but slower write performance. • RAID 10 - Combines mirrored physical disks with data striping. If a physical disk fails, data can be rebuilt using the mirrored data. RAID 10 offers good read and write performance with good data redundancy. • RAID 50 - A dual-level array that uses multiple RAID 5 sets in a single array. A single physical disk failure can occur in each of the RAID 5 without any loss of data on the entire array. Although the RAID 50 has increased write performance, its performance decreases, data or program access gets slower, and transfer speeds on the array are affected when a physical disk fails and reconstruction takes place. • RAID 60 - Combines the straight block level striping of RAID 0 with the distributed double parity of RAID 6. The system must have at least eight physical disks to use RAID 60. Failures while a single physical disk is rebuilding in one RAID 60 set do not lead to data loss. RAID 60 has improved fault tolerance because more than two physical disks on either span must fail for data loss to occur. NOTE: Depending on the type of controllers, some RAID levels are not supported. Minimum disk requirement for different RAID levels Table 12. RAID level and number of disks RAID Level 0 1 5 6 10 50 60 Minimum Number of Disks 1* 2 3 4 4 6 8 * For PERC S110 and S130 RAID controllers, a minimum of two hard-disk drives are required. Selecting physical disks Use the Select Physical Disks screen to select the physical disks to be used for the virtual drive and select the physical disk driverelated properties. 46

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NOTE: RAID 0 does not provide data redundancy and hot spare. Other RAID levels provide data redundancy and
enable you to reconstruct data in the event of a disk-drive failure.
NOTE: You can create only one virtual disk using Lifecycle Controller. To create multiple virtual disks, use Option
ROM. To access Option ROM, press <Ctrl> <R> during boot or POST.
Selecting a RAID controller
The
View Current RAID Configuration and Select Controller
page displays all supported RAID controllers attached to the system.
Select the RAID controller on which you want to create the virtual disk, and then click
Next
.
Selecting RAID levels
Select a
RAID Level
for the virtual disk:
•
RAID 0
— Stripes data across the physical disks. RAID 0 does not maintain redundant data. When a physical disk fails in a RAID
0 virtual disk, there is no method for rebuilding the data. RAID 0 offers good read and write performance with zero data
redundancy.
•
RAID 1
— Mirrors or duplicates data from one physical disk to another. If a physical disk fails, data can be rebuilt using the data
from the other side of the mirror. RAID 1 offers good read performance and average write performance with good data
redundancy.
•
RAID 5
— Stripes data across the physical disks, and uses parity information to maintain redundant data. If a physical disk fails,
the data can be rebuilt using the parity information. RAID 5 offers good read performance and slower write performance with
good data redundancy.
•
RAID 6
— Stripes data across the physical disks, and uses two sets of parity information for additional data redundancy. If one
or two physical disks fail, the data can be rebuilt using the parity information. RAID 6 offers good data redundancy and read
performance but slower write performance.
•
RAID 10
— Combines mirrored physical disks with data striping. If a physical disk fails, data can be rebuilt using the mirrored
data. RAID 10 offers good read and write performance with good data redundancy.
•
RAID 50
— A dual-level array that uses multiple RAID 5 sets in a single array. A single physical disk failure can occur in each of
the RAID 5 without any loss of data on the entire array. Although the RAID 50 has increased write performance, its performance
decreases, data or program access gets slower, and transfer speeds on the array are affected when a physical disk fails and
reconstruction takes place.
•
RAID 60
— Combines the straight block level striping of RAID 0 with the distributed double parity of RAID 6. The system must
have at least eight physical disks to use RAID 60. Failures while a single physical disk is rebuilding in one RAID 60 set do not lead
to data loss. RAID 60 has improved fault tolerance because more than two physical disks on either span must fail for data loss to
occur.
NOTE: Depending on the type of controllers, some RAID levels are not supported.
Minimum disk requirement for different RAID levels
Table 12. RAID level and number of disks
RAID Level
Minimum Number of Disks
0
1*
1
2
5
3
6
4
10
4
50
6
60
8
* For PERC S110 and S130 RAID controllers, a minimum of two hard-disk drives are required.
Selecting physical disks
Use the
Select Physical Disks
screen to select the physical disks to be used for the virtual drive and select the physical disk drive-
related properties.
46