Vivotek NR9682-v2 64-Channel NVR (No HDD) - Manual (Page 49)

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User's Manual - 49
A RAID 5 drive group uses disk striping and parity data across all drives (distributed parity) to
provide high data throughput, especially for small random access.A RAID 6 drive group uses
distributed parity, with two independent parity blocks per stripe, and disk striping.
A RAID 6 virtual drive can survive the loss of any two drives without losing data. A RAID 6 drive
group, which requires a minimum of three drives, is similar to a RAID 5 drive group. Blocks of
data and parity information are written across all drives. The parity information is used to recover
the data if one or two drives fail in the drive group.
A RAID 00 drive group is a spanned drive group that creates a striped set from a series of
RAID 0 drive groups.A RAID 10 drive group, a combination of RAID 0 and RAID 1 drive groups,
consists of striped data across mirrored spans.
A RAID 10 drive group is a spanned drive group that creates a striped set from a series of
mirrored drives. A RAID 10 drive group allows a maximum of 8 spans. You must use an even
number of drives in each RAID virtual drive in the span. The RAID 1 virtual drives must have
the same stripe size. A RAID 10 drive group provides high data throughput and complete data
redundancy but uses a larger number of spans.
A RAID 50 drive group, a combination of RAID 0 and RAID 5 drive groups, uses distributed
parity and disk striping. A RAID 50 drive group is a spanned drive group in which data is striped
across multiple RAID 5 drive groups. A RAID 50 drive group works best with data that requires
high reliability, high request rates, high data transfers, and medium-to-large capacity.
NOTE
Having virtual drives of different RAID levels, such as RAID Level0 and RAID Level5, in the
same drive group is not allowed. For example, if an existing RAID5 virtual drive is created out
of partial space in an array, the next virtual drive in the array has to be RAID Level 5 only.
A RAID 60 drive group, a combination of RAID level 0 and RAID Level 6, uses distributed parity,
with two independent parity blocks per stripe in each RAID set, and disk striping. A RAID 60
virtual drive can survive the loss of two drives in each of the RAID 6 sets without losing data. A
RAID 60 drive group works best with data that requires high reliability, high request rates, high
data transfers, and medium-to-large capacity.
NOTE
The MegaSR controller supports the standard RAID levels – RAID0, RAID1, RAID5, and
RAID10. The MegaSR controller comes in two variants, SCU and AHCI, both supporting a
maximum of eight physical drives. A maximum of eight virtual drives can be created (using
RAID0, RAID 1, RAID5, and RAID10 only) and controlled by the MegaSR controller. One
virtual drive can be created on an array (a maximum of eight if no other virtual drives are
already created on the MegaSR controller), or you can create eight arrays with one virtual
drive each. However, on a RAID10 drive group, you can create only one virtual drive on a
particular array.