HP Surestore Disk Array 12h 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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