Users Guide

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.
不同 RAID 级别的最低磁盘数量要求
表. 11: RAID 级别和磁盘数
RAID 级别 最小磁盘数
0 1*
1 2
5 3
6 4
10 4
50 6
60 8
* 对于 PERC S140 / S150 RAID 控制器，则需要至少两个硬盘驱动器。
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.
The number of physical disks required for the virtual disk varies depending on the RAID level. The minimum and maximum numbers of
physical disks required for the RAID level are displayed on the screen.
● Protocol — Select the protocol for the disk pool: Serial Attached SCSI (SAS), Serial ATA (SATA), or NVM Express (NVMe).
SAS drives are used for high performance, while SATA drives are used for a more cost-effective solution. A disk pool is a logical
grouping of physical disk drives on which one or more virtual drives can be created. The protocol is the type of technology used to
implement RAID.
38 Configure