Appendix A: Storage
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Figure 26-1 RAID 5
• RAID 6 - Preserves against the loss of two disks failing at once by combining the contents of
three or more disks. However, the total storage capacity is reduced by two disks.
Figure 26-2 RAID 6
Virtual Disks (Logical Unit Numbers)
• A virtual disk represents an individually addressable (logical) SCSI device that is a partition of a
physical SCSI device (target).
• Virtual disks are also known as volumes or LUNs.
• In enterprise-level systems, virtual disks usually represent s
egments of large RAID disk arrays.
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