Storage Manager 60-NT Introduction Guide

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuring Storage Arrays
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ONFIGURING STORAGE ARRAYS 21
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RAID Level Short Description Detailed Description
RAID 0
(Not
recommended)
Non-Redundant, Striping Mode – Offers high performance, but doesn’t provide any data
redundancy
– Stripes data across all of the drives in the volume group
– Not recommended for high availability needs; better for
non-critical data
– If a single drive fails in the volume group, all associated
volumes fail. All data is lost.
RAID 1 Mirroring Mode
(Data striping is added if
multiple drive pairs are used in
the volume)
– Uses mirrored disk pairs for redundancy.
– When multiple pairs of disks are included in a RAID 1
volume, data is striped across the disks. This
configuration is also called RAID 0/1
– Offers high performance
– Offers the best data availability, but because all data is
mirrored the effective storage capacity is only one-half
the total capacity.
– If a single drive fails in a RAID 1 volume group, all
associated volumes become degraded but the mirrored
data allows the data to still be accessed.
– If both drives in a mirrored pair fail in a RAID 1 volume
group, all associated volumes fail. All data is lost.