HP Surestore Disk Array FC60 Storage Manager 60-NT Introduction Guide - Page 22

Configuring Storage Arrays .. .

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Configuring Storage Arrays RAID 3 High Bandwidth Mode RAID 5 High I/O Mode Note - 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. - 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. CAUTION 22 CONFIGURING STORAGE ARRAYS

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Configuring Storage Arrays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
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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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