Storage Manager 60-NT Introduction Guide

Configuring Storage Arrays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22 C
ONFIGURING STORAGE ARRAYS
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RAID 3 High Bandwidth Mode – User data and redundant information (parity) is striped
across the drives
– The equivalent of one drive’s worth of capacity is used
for redundancy information
– Good for large data transfers in applications such as
multimedia or medical imaging that write and read large
sequential chunks of data
– If a single drive fails in a RAID 3 volume group, all
associated volumes become degraded but the
redundancy information allows the data to still be
accessed.
– If two or more drives fail simultaneously in a RAID 3
volume group, all associated volumes fail. All data is
lost.
RAID 5 High I/O Mode – User data and redundant information (parity) is striped
across the drives.
– The equivalent of one drive’s worth of capacity is used
for redundant information.
– Good for multi-user environments such as database or
filesystem storage where typical I/O size is small and
there is a high proportion of read activity.
– If a single drive fails in a RAID 5 volume group, all
associated volumes become degraded but the
redundant information allows the data to still be
accessed.
– If two or more drives fail simultaneously in a RAID 5
volume group, all associated volumes fail. All data is
lost.
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