
Contents ix
F. Selecting the Best RAID Level 91
Understanding Drive Segments 92
Nonredundant Arrays (RAID 0) 92
RAID 1 Arrays 93
RAID 1 Enhanced Arrays 94
RAID 10 Arrays 95
RAID 5 Arrays 96
RAID 5EE Arrays 97
RAID 50 Arrays 98
RAID 6 Arrays 100
RAID 60 Arrays 101
Selecting the Best RAID Level 101
Migrating RAID Levels 102
G. Introduction to Serial Attached SCSI 103
Terminology Used in This Appendix 104
About SAS 104
About SAS Device Communication 105
About Phys 105
About SAS Ports 106
About SAS Addresses 106
About SAS Connectors 107
About SAS Cables 107
About Identifying Disk Drives in SAS 107
About SAS Connection Options 108
Direct-Attach Connections 108
Backplane Connections 108
SAS Expander Connections 109
Differences Between SAS and Parallel SCSI 110
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