User's Manual

220 Virtual Disks
continues to function. This feature provides data redundancy and
good read performance, but slightly slower write performance. Your
system must have at least two disks to use RAID 1.
– Select
RAID 5 for striping with distributed parity. This selection
groups n disks together as one large virtual disk with a total capacity of
(n-1) disks. When a disk fails, the virtual disk continues to function.
This feature provides better data redundancy and read performance,
but slower write performance. Your system must have at least three
disks to use RAID 5.
– Select
RAID 6 for striping with additional distributed parity. This
selection groups n disks as one large virtual disk with a capacity of (n-
2) disks. The virtual disk remains functional with up to two disk
failures. RAID 6 provides better read performance, but slower write
performance. Your system must have at least four disks to use RAID 6.
– Select
RAID 10 for striping over mirror sets. This selection groups n
disks together as one large virtual disk with a total capacity of (n/2)
disks. Data is striped across the replicated mirrored pair disks. When a
disk fails, the virtual disk continues to function. The data is read from
the surviving mirrored pair disk. This feature provides the best failure
protection, read and write performance. Your system must have at
least four disks to use RAID 10.
– Select
RAID 50 to implement striping across more than one span of
physical disk s. RAID 50 groups n*s disks as one large virtual disk with
a capacity of s*(n-1) disks, where s is the number of spans and n is the
number of disks within each span.
– Select
RAID 60 to implement striping across more than one RAID 6
span. RAID 60 Groups n*s disks as one large virtual disk with a
capacity of s*(n-2) disks, where s is the number of spans and n is the
number of disks within each span. RAID 60 provides increased data
protection and better read performance, but slower write performance.
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