Glossary
Glossary-4
DAC960PG Installation Guide
Critical: A Logical Drive is in a “critical” state if...
It has been configured at RAID level 1, 3, 5, or 0+1; and
One (and only one) of its SCSI drives is not “online.”
A logical drive is considered “critical” because any failure of another of its
SCSI drives may result in a loss of data.
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Note
I/O operation can only be performed with system
drives that are online or critical.
Offline: A Logical Drive is in an “offline” state if...
No data can be read from it or written to it.
System commands issued to offline logical drives are returned with an error
status: no operations can be performed on offline logical drives. A logical
drive can be “offline” under one of two situations described below:
• It is configured with a redundant RAID level (1, 3, 5, or 0+1), and two
or more of its SCSI drives are not “online”; or
• It is configured at RAID level 0, JBOD, or in a spanned set, and one or
more of its SCSI drives are not “online.”
Logical Drives
See “System Drives.”
Mirroring
Refers to the 100% duplication of data on one disk drive to another disk
drive. Each disk will be the mirror image of the other.
Pack
See “Drive Groups (or Drive Packs).”
Parity
See “Rotated XOR Redundancy.”
Summary of Contents for DAC960PG
Page 1: ...PCI RAID Controller Installation Guide DAC960PG PCI to Ultra SCSI P N 771971 D01...
Page 2: ......
Page 10: ......
Page 24: ...DAC960PG Specifications 1 10 DAC960PG Installation Guide...
Page 35: ...Functional Description Manual No 771971 2 11 Figure 2 4 Configuration on Disk Flowchart...
Page 48: ...Cache Management 2 24 DAC960PG Installation Guide...
Page 76: ...System Reboot or Power Down 4 10 DAC960PG Installation Guide...
Page 78: ...SAF TE A 2 DAC960PG Installation Guide...
Page 90: ...Battery Backup Capacity B 12 DAC960PG Installation Guide...
Page 102: ...Glossary Glossary 12 DAC960PG Installation Guide...
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