HP Surestore Disk Array FC60 Storage Manager 60-NT Introduction Guide - Page 21

RAID Level, Short Description, Detailed Description

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Configuring Storage Arrays CAUTION 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. CONFIGURING STORAGE ARRAYS 21

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