Users Guide
• 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 oers 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 oers 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 oers 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 oers 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 oers 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 aected 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 6 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.
Minimum Disk Requirement for Dierent RAID Levels
Table 4. : 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 S110 RAID controller, 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.
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) or Serial ATA (SATA). SAS drives are used for
high performance, while SATA drives provide a more cost-eective 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.
• Media Type — Select the media type for the disk pool: Hard Disk Drives (HDD) or Solid State Disks (SSD). HDDs use
traditional rotational magnetic media for data storage and SSDs implement ash memory for data storage.
• Encryption Capability — Select Yes to enable encryption capability
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