Users Guide

• 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 oers 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 oers 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 aected 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 dierent RAID levels
Table 11. 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.
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-eective 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.
• Disk Boot Size — Select one of the following disk block sizes:
• 512 — indicates that the 512 bytes block size hard drives (HDD) are selected.
• 4K — indicates that the 4K block size hard disk drives (HDD) are selected. 4K block HDDs allows the faster data transfer with
fewer commands.
• T10 Protection Information (T10 PI) Capability— It is known as DIF (Data Integrity Fields) and the supporting HDDs are referred to
DIF drives. The T10 enabled HDDs validates and stores the data integrity elds for each blocks. It performs this action when you write
50
Congure