for each option/RAID level are as follows:
RAID0
: Also called “disk striping,” where multiple physical drives are merged to create a
single logical volume.
Minimum number of drives
: 2
Maximum number of drives
: 4
Fault tolerance
: None
Performance
: Excellent; improves both read and write performance
Other considerations
: None
RAID1:
Also called “drive mirroring,” where a drive has an exact duplicate copy of data
maintained on another disk.
Minimum number of drives
: 2 (per array)
Maximum number of drives
: 2 (per array)
Fault tolerance
: Excellent; complete redundancy
Performance
: Good; some reduction in write performance
Other considerations
: 50% reduction in useable space as the drive containing
the mirror is not available to the user; drives must be identical
RAID10:
Also called RAID 0+1, this is a combination of disk striping (RAID 0) and
mirroring (RAID 1). Two disks are striped together in a single volume, with a
mirrored striped set for redundancy.
Minimum number of drives
: 4
Maximum number of drives
: 4
Fault tolerance
: Excellent; complete redundancy
Performance
: Good; some reduction in write performance
Other considerations
: 50% reduction in useable space as the drives containing
the mirror is not available to the user; drives must be identical
SPARE DRIVE:
This is used in conjunction with RAID 1 (mirroring) and allows the
computer to keep running in the event of a drive failure without user
intervention, even if it is the boot drive that has failed. Also referred to as RAID
1+S.
Minimum number of drives
: 1 (requires an associated RAID 1 array)
Maximum number of drives
: 1 (requires an associated RAID 1 array)
Fault tolerance
: Adds seamless disaster recovery to a RAID 1 configuration
Performance
: Not applicable
Other considerations
: Drive is not available to the user; drive must be identical
to the models used in the associated RAID 1 array
After you select which RAID level you wish to use, you will have to select drives to
include in the array. Follow the on-screen prompts to complete the configuration.
Please
note: If you wish to use the RAID 1+S (“spare drive”) option, you must configure a
RAID 1 array first.
Deciding which RAID solution to implement has some important implications for the
performance of your system and the safety of your data. This is intended as a guide
only, so you should investigate the wealth of information available on the Internet or
Instruction Manual
7
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